UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

Form 10-K

(MARK ONE)

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, ~~2017~~2018

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file no. 001-33078

Archrock Partners, L.P.

(Exact name of registrant as specified in its charter)

Delaware		22-3935108
(State or Other Jurisdiction of		(I.R.S. Employer
(State or Other Jurisdiction of Incorporation or Organization)		(I.R.S. Employer Identification No.)
Incorporation or Organization)		Identification No.)

9807 Katy Freeway, Suite 100
Houston, Texas		77024
(Address of principal executive offices)		(Zip Code)

9807 Katy Freeway, Suite 100, Houston, Texas 77024

(Address of principal executive offices, zip code)

(281) 836-8000

(Registrant’s telephone number, including area code)

Securities Registered Pursuant to Section 12(b) of the Act:

Title of each class Name of each exchange on which registered Common Units representing limited partner interests ~~NASDAQ Global Select Market~~None

Securities Registered Pursuant to Section 12(g) of the Act: None

Archrock Partners, L.P. meets the conditions set forth in General Instruction (I)(1)(a) and (b) of Form 10-K and is therefore filing this Form 10-K with the reduced disclosure format.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes o No x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 (d) of the Act. Yes o No x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the registrant has submitted electronically ~~and posted on its corporate Web site, if any,~~ every Interactive Data File required to be submitted ~~and posted~~ pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit ~~and post~~ such files). Yes x No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§ 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer o		Accelerated filer xo
Non-accelerated filer o		(Do not check if a smaller reporting company)
Non-accelerated filer x		Smaller reporting company o
Emerging growth company o		~~Smaller reporting company o~~
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x

~~The~~As ~~aggregate~~of ~~market~~February ~~value~~19, of2019, ~~the~~there were 70,231,036 common units outstanding, all of ~~the~~which ~~registrant~~were held indirectly by ~~non-affiliates as of June 30~~Archrock, ~~2017 was $541,268,993~~Inc.

As of February 15, 2018, there were 70,196,981 common units outstanding.

______________________________________________________

DOCUMENTS INCORPORATED BY REFERENCE: NONE

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TABLE OF CONTENTS

	Page
Glossary	3
Omission of Information by Certain Wholly-Owned Subsidiaries	5
Forward-Looking Statements	6
PART I
Item 1. Business	68
Item 1A. Risk Factors	199
Item 1B. Unresolved Staff Comments	4019
Item 2. Properties	4019
Item 3. Legal Proceedings	4119
Item 4. Mine Safety Disclosures	4119
PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	4220
Item 6. Selected Financial Data	4420
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations	48
Item 7. Management’s Analysis of Results of Operations	20
Item 7A. Quantitative and Qualitative Disclosures About Market Risk	6222
Item 8. Financial Statements and Supplementary Data	6222
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	6322
Item 9A. Controls and Procedures	6322
Item 9B. Other Information	6524
PART III
Item 10. Directors, Executive Officers and Corporate Governance	6625
Item 11. Executive Compensation	7125
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Unitholder Matters	9425
Item 13. Certain Relationships and Related Transactions and Director Independence	9525
Item 14. Principal Accountant Fees and Services	9925
PART IV
Item 15. Exhibits and Financial Statement Schedules	~~100~~26
SIGNATURES	~~104~~29

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GLOSSARY

The following terms and abbreviations appearing in the text of this report have the meanings indicated below.

2006 LTIP	~~The~~ Archrock Partners, L.P. Long Term Incentive Plan, adopted in October 2006
2015 Technical Termination	~~The~~Technical ~~technical~~ termination of the Partnership for U.S. federal income tax purposes as a result of the Spin-off, occurring on the date of the Spin-off
2016 Form 10-K	Archrock Partners, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2016
2018 Form 10-K	Archrock Partners, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2018
2017 Form 10-K	Archrock Partners, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2017
Amendment No. 1	Amendment No. 1 to Credit Agreement dated February 23, 2018, which amended that Credit Agreement, dated as of March 30, 2017, which governs the Credit Facility
2017 LTIP	The Archrock Partners, L.P. Long Term Incentive Plan adopted in April 2017
Anadarko	Anadarko Petroleum Company
51st District Court	51st Judicial District Court of Irion County, Texas
Archrock	Prior to the Merger: Archrock, Inc., individually and together with its wholly-owned subsidiariesSubsequent to the Merger: Archrock, Inc., individually and together with its wholly-owned subsidiaries, excluding the Partnership
Anadarko	Anadarko Petroleum Corporation
ASC Topic 842 Leases	Accounting Standards Codification Topic 842 Leases as promulgated by Accounting Standards Update No. 2016-02 Leases (Topic 842) and further updated by Accounting Standards Update No. 2018-11 Leases (Topic 842): Targeted Improvements
April 2015 Contract Operations Acquisition	The April 2015 acquisition of contract operations customer service agreements and compressor units from Archrock
ASU 2016-13	Accounting Standards Update No. 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
Archrock	Archrock, Inc., individually and together with its wholly-owned subsidiaries, formerly Exterran Holdings, Inc.
ASU 2016-15	Accounting Standards Update No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments
Archrock GP	Archrock GP LLC, the general partner of the Partnership’s General Partner and the conductor of our business and operations
ASU 2017-12	Accounting Standards Update No. 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities
Archrock Share Issuance	The issuance of Archrock common stock in exchange for the Partnership’s common units not already owned by Archrock and its subsidiaries, as contemplated in the Proposed Merger
ASU 2018-13	Accounting Standards Update No. 2018-13 Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement
Bcf	Billion cubic feet
BLM	U.S. Department of the Interior’s Bureau of Land Management
CAA	Clean Air Act
CERCLA	Comprehensive Environmental Response, Compensation, and Liability Act
Credit Facility	$1.25 billion asset-based revolving credit facility, as amended by Amendment No. 1
Code	Internal Revenue Code of 1986, as amended
Debt Agreements	Credit Facility and Notes, collectively
Credit Facility	$1.1 billion asset-based revolving credit facility due March 2022
CWA	Clean Water Act
Debt Agreements	The Credit Facility and the Notes, collectively
Distribution Date	The date on which Archrock completed the Spin-off, which was November 3, 2015
EBITDA	Earnings before interest, taxes, depreciation and amortization
EES Leasing	Archrock Services Leasing LLC, formerly known as EES Leasing LLC
EIA	U.S. Energy Information Administration
EPA	Environmental Protection Agency
Exchange Act	Securities Exchange Act of 1934, as amended
EXLP Leasing	Archrock Partners Leasing LLC, formerly known as EXLP Leasing LLC
FASB	Financial Accounting Standards Board
Financial Statements	~~The Partnership’s~~ Consolidated Financial Statements included in Part IV, Item 15 “Exhibits and Financial Statement Schedules” of this ~~2017~~2018 Form 10-K
Former Credit Facility	$825.0 million revolving credit facility and $150.0 million term loan, terminated in March 2017
GAAP	Accounting principles generally accepted in the U.S.
General Partner	Archrock General Partner, L.P., ~~our~~the Partnership’s general partner, and an indirect, wholly-owned subsidiary of Archrock
Heavy Equipment Statutes	Texas Tax Code §§ 23.1241, 23.1242
HSR Act	Hart-Scott-Rodino Antitrust Improvements Act of 1976
IRAs	Individual retirement accounts
LIBOR	London Interbank Offered Rate
March 2016 Acquisition	~~The Partnership’s~~ March 2016 acquisition of contract operations customer service agreements and compressor units from a third party
Merger	Transaction in which Archrock acquired all of the Partnership’s outstanding common units not already owned by Archrock pursuant to the Agreement and Plan of Merger, dated as of January 1, 2018, among Archrock and the Partnership, which was amended by Amendment No. 1 to Agreement and Plan of Merger on January 11, 2018, and which was completed and effective on April 26, 2018
NAAQS	National Ambient Air Quality Standards

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Merger Agreement	Agreement and Plan of Merger, dated as of January 1, 2018, among Archrock, the Partnership, the General Partner and Archrock GP, which was amended by Amendment No. 1 to Agreement and Plan of Merger on January 11, 2018, to add Merger Sub as a party thereto
Merger Sub	Amethyst Merger Sub LLC, a Delaware limited liability company and an indirect wholly owned subsidiary of Archrock
MMBtu	Million British thermal unit
NAAQS	National Ambient Air Quality Standards
Notes	$350.0 million of 6% senior notes due April 2021 and $350.0 million of 6% senior notes due October 2022
November 2016 Contract Operations Acquisition	~~The~~ November 2016 acquisition of contract operations customer service agreements and compressor units from Archrock
NSPS	New Source Performance Standards
Omnibus Agreement	~~The~~ Partnership’s ~~omnibus~~Fifth ~~agreement~~Amended ~~with~~and ~~Archrock,~~Restated ~~the~~Omnibus ~~Partnership’s~~Agreement ~~general~~with ~~partner~~certain ~~and~~Archrock ~~others~~entities, dated as ~~amended~~of ~~and/or~~April ~~restated~~26, 2018
OSHA	Occupational Safety and Health Act
Paris Agreement	Resulting agreement of the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change held in Paris, France
Paris Agreement	The resulting agreement of the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change held in Paris, France
Partnership, we, our, us	Archrock Partners, L.P., together with its subsidiaries
Partnership Agreement	First Amended and Restated Agreement of Limited Partnership of Exterran Partners, L.P. (now Archrock Partners, L.P.), as amended, dated as of April 14, 2008
ppb	Parts per billion
Proposed Merger	The transaction contemplated by the Merger Agreement pursuant to which Archrock will acquire all of the Partnership’s outstanding common units not already owned by Archrock
RCRA	Resource Conservation and Recovery Act
Revenue Recognition Update	Accounting Standards Update No. 2014-09 Revenue from Contracts with Customers (Topic 606) and additional related standards updates
Revolving Loan Agreement	Agreement dated April 26, 2018 among the Partnership and Archrock under which the Partnership may make loans to Archrock
ROU	Right-of-use, as related to the new lease model under ASC Topic 842 Leases
SEC	U.S. Securities and Exchange Commission
Segment Reporting	Accounting Standards Codification Topic 280
SG&A	Selling, general and administrative
Spin-off	~~The spin~~Spin-off of Archrock’s international contract operations, international aftermarket services and global fabrication businesses into a standalone public company operating as Exterran Corporation which we completed in November 2015
Tax Cuts and Jobs Act, TCJA	Public Law No. 115-97, a comprehensive tax reform bill signed into law on December 22, 2017
TCEQ	Texas Commission on Environmental Quality
Tcf	Trillion cubic feet
Update 2017-12	Accounting Standards Update No. 2017-12 Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities
Update 2016-02	Accounting Standards Update No. 2016-02 Leases (Topic 842)
Update 2016-09	Accounting Standards Update No. 2016-09 Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting
Update 2016-13	Accounting Standards Update No. 2016-13 Financial Instruments - Credit Losses (Topic 326):Measurement of Credit Losses on Financial Instruments
Update 2016-15	Accounting Standards Update No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments
U.S.	United States of America
VOC	Volatile organic compounds
Williams Partners	Williams Partners, L.P.

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~~PART I~~OMISSION OF INFORMATION BY CERTAIN WHOLLY-OWNED SUBSIDIARIES

~~DISCLOSURE~~We ~~REGARDING~~meet ~~FORWARD~~the conditions specified in General Instruction I(1)(a) and (b) of Form 10-~~LOOKING~~K ~~STATEMENTS~~and are thereby permitted to use the reduced disclosure format for wholly-owned subsidiaries of reporting companies specified therein. Accordingly, we have omitted from this 2018 Form 10-K the information called for by the following sections:

~~This~~• ~~2017~~Part ~~Form~~II ~~10-K~~Item ~~contains~~6 “~~forward-looking~~Selected ~~statements.”~~Financial All statements other than statements of historical fact contained in this 2017 Form 10-K are forward-looking statements, including, without limitation, statements regarding the consummation of the Proposed Merger, including the timing and expected effects thereof; the Partnership’s business growth strategy and projected costs; future financial position; the sufficiency of available cash flows to fund continuing operations and make cash distributions; the expected amount of our capital expenditures; anticipated cost savings; future revenue, gross margin and other financial or operational measures related to our business; the future value of our equipment; and plans and objectives of our management for our future operations. You can identify many of these statements by looking for words such as “believe,Data” ~~“expect,” “intend,” “project,” “anticipate,” “estimate,” “will continue” or similar words or the negative thereof.~~

~~Such~~• ~~forward-looking~~Part ~~statements~~III ~~are~~Item ~~subject to various risks and uncertainties that could cause actual results to differ materially from those anticipated as of the date of this 2017 Form~~ 10~~-K.~~ Although we believe that the expectations reflected in these forward-looking statements are based on reasonable assumptions, no assurance can be given that these expectations will prove to be correct. Known material factors that could cause our actual results to differ from those in these forward-looking statements are described below, in Part I, Item 1A (“~~Risk~~Directors ~~Factors”)~~ and ~~Part II, Item 7~~Executive ~~(“Management’s~~Officers ~~Discussion and Analysis~~ of ~~Financial Condition and Results of Operations”) of this 2017 Form 10-K. Important factors that could cause our actual results to differ materially from~~ the ~~expectations reflected in these forward-looking statements include, among other things:~~Registrant”

• ~~the~~Part ~~ability~~III toItem ~~obtain~~11 ~~the~~“Executive ~~requisite approvals from our unitholders and Archrock’s stockholders relating to the Proposed Merger;~~Compensation”

• ~~the~~Part ~~risk~~III ~~that~~Item we12 or“Security ~~Archrock~~Ownership ~~may~~of beCertain ~~unable~~Beneficial toOwners ~~obtain governmental~~ and regulatory approvals required for the Proposed Merger or required governmental and regulatory approvals may delay the Proposed Merger or result in the imposition of conditions that could cause the parties to abandon the Proposed Merger (early termination of the waiting period under the HSR Act was granted on February 9, 2018);Management”

• ~~the~~Part ~~risk~~III ~~that~~Item a13 ~~condition~~“Certain toRelationships ~~closing~~and ofRelated ~~the Proposed Merger may not be satisfied;~~Transactions”

• ~~the~~List ~~timing~~of tosubsidiaries ~~complete~~exhibit ~~the~~required ~~Proposed~~by ~~Merger;~~Item 601

•In ~~the risk that cost savings~~addition, ~~tax~~disclosure ~~benefits~~within ~~and any other synergies from~~ the ~~Proposed~~following ~~Merger~~items ~~may~~has ~~not~~been bereduced ~~fully~~as ~~realized~~permitted orby ~~may~~General ~~take~~Instruction ~~longer to realize than expected;~~I:

• ~~disruption~~In ~~from~~lieu of the ~~Proposed~~information ~~Merger~~called ~~may~~for ~~make~~by itPart ~~more~~I ~~difficult~~Item to1 ~~maintain~~“Business,” ~~relationships~~we ~~with~~have ~~customers~~included, ~~employees~~under orthat ~~suppliers;~~same item, a brief description of the business transacted during the most recent fiscal year that in our management’s opinion indicates the general nature and scope of our business.

• In lieu of the ~~possible~~information ~~diversion~~called for by Part II Item 7 “Management’s Discussion and Analysis of ~~management~~Financial ~~time~~Condition onand ~~issues~~Results ~~related~~of Operations,” we have included, under Item 7, “Management’s Narrative Analysis of Results of Operations” to explain the ~~Proposed~~reasons ~~Merger;~~for material changes in the amount of revenue and expense items in the most recent fiscal year presented as compared to the fiscal year immediately preceding.

~~• the impact and outcome of pending and future litigation, including litigation, if any, relating to the Proposed Merger;~~5

•Table ~~conditions in the oil and natural gas industry, including a sustained decrease in the level~~ of ~~supply or demand for oil or natural gas or a sustained low price of oil or natural gas;~~Contents

FORWARD-LOOKING STATEMENTS

This 2018 Form 10-K contains “forward-looking statements.” All statements other than statements of historical fact contained in this 2018 Form 10-K are forward-looking statements including, without limitation, statements regarding the effects of the Merger; the Partnership’s business growth strategy and projected costs; future financial position; the sufficiency of available cash flows to fund continuing operations and make cash distributions; anticipated cost savings; future revenue and other financial or operational measures related to our business; the future value of our equipment; and plans and objectives of our management for our future operations. You can identify many of these statements by words such as “believe,” “expect,” “intend,” “project,” “anticipate,” “estimate,” “will continue” or similar words or the negative thereof.

Such forward-looking statements are subject to various risks and uncertainties that could cause actual results to differ materially from those anticipated as of the date of this 2018 Form 10-K. Although we believe that the expectations reflected in these forward-looking statements are based on reasonable assumptions, no assurance can be given that these expectations will prove to be correct. Known material factors that could cause our actual results to differ materially from those in these forward-looking statements are described below, in Part I, Item 1A (“Risk Factors”) and Part II, Item 7 (“Management’s Narrative Analysis of Results of Operations”) of this 2018 Form 10-K. Important factors that could cause our actual results to differ materially from the expectations reflected in these forward-looking statements include, among other things:


•	the risk that cost savings, tax benefits and any other synergies from the Merger may not be fully realized or may take longer to realize than expected;


•	conditions in the oil and natural gas industry, including the level of production of, demand for or price of oil or natural gas;


•	our reduced profit margins or the loss of market share resulting from competition or the introduction of competing technologies by other companies;


•	our dependence on Archrock to provide personnel and services, including its ability to hire, train and retain key employees and to cost-effectively perform the services necessary to conduct our business;


•	changes in economic or political conditions, including terrorism and legislative changes;


•	the inherent risks associated with our operations, such as equipment defects, impairments, malfunctions and natural disasters;

• the loss of our status as a partnership for U.S. federal income tax purposes;

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•	the risk that counterparties will not perform their obligations under our financial instruments;


•	the financial condition of our customers;


•	our ability to implement certain business and financial objectives, such as:

•– winning profitable new business;

•– growing our asset base and enhancing asset utilization;

•– integrating acquired businesses;

•– generating sufficient cash; and

•– accessing the capital markets at an acceptable cost;


•	liability related to the use of our services;


•	changes in governmental safety, health, environmental or other regulations, which could require us to make significant expenditures; and


•	our level of indebtedness and ability to fund our business.

All forward-looking statements included in this 2017 Form 10-K are based on information available to us on the date of this 2017 Form 10-K. Except as required by law, we undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained throughout this 2017 Form 10-K.

Item 1. Business

General

We are a Delaware limited partnership formed in June 2006. In November 2015, Archrock completed the Spin-off of its international contract operations, international aftermarket services and global fabrication businesses into a standalone public company operating as “Exterran Corporation.” Archrock continues to hold interests in us, including the sole general partner interest, certain limited partner interests and all of the incentive distribution rights.

Archrock completed an internal restructuring in connection with the Spin-off which we believe, when combined with the sale or exchange of Partnership units during the 12 months prior to the Spin-off, resulted in a technical termination of the Partnership for U.S. federal income tax purposes on the Distribution Date. The technical termination did not affect our consolidated financial statements nor did it affect our classification as a partnership or otherwise affect the nature or extent of our “qualifying income” for U.S. federal income tax purposes. Our taxable year for all unitholders ended on the Distribution Date and resulted in a deferral of depreciation deductions that were otherwise allowable in computing the taxable income of our unitholders. This deferral of depreciation deductions may have resulted in increased taxable income (or reduced taxable loss) to certain of our unitholders in 2015.

We are the U.S. market leader in the full-service natural gas compression industry. As of December 31, 2017, public unitholders held a 57% ownership interest in us and Archrock owned our remaining equity interests including our general partner interest and all of the incentive distribution rights. Our General Partner has sole responsibility for conducting our business and for managing our operations, which are conducted through our wholly-owned limited liability company, Archrock Partners Operating LLC. Because our General Partner is a limited partnership, its general partner, Archrock GP, conducts our business and operations. Archrock GP’s board of directors and officers, which we sometimes refer to as our board of directors and our officers, make decisions on our behalf. All of those directors are elected by Archrock.

Our contract operations services primarily include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment. We monitor our customers’ compression services requirements over time and, as necessary, modify the level of services and related equipment we employ to address changing operating conditions. We operate in one segment; see our Financial Statements for more information regarding our results of operations and financial condition.

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~~Our~~All ~~Omnibus~~forward-looking ~~Agreement~~statements ~~with~~included ~~Archrock~~in this 2018 Form 10-K are based on information available to us on the date of this 2018 Form 10-K. Except as required by law, ~~our~~we ~~General~~undertake ~~Partner~~no ~~and~~obligation ~~others~~to ~~includes~~publicly update or revise any forward-looking statement, ~~among~~whether ~~other~~as ~~things:~~a result of new information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained throughout this 2018 Form 10-K.

• certain agreements not to compete between Archrock and its affiliates, on the one hand, and us and our affiliates, on the other hand;

• Archrock’s obligation to provide all operational staff, corporate staff and support services reasonably necessary to operate our business and our obligation to reimburse Archrock for such services;

• the terms under which we, Archrock, and our respective affiliates may transfer, exchange or lease compression equipment among one another;

• Archrock’s grant to us of a license to use certain intellectual property, including our logo; and

• Archrock’s and our obligations to indemnify each other for certain liabilities.

Our General Partner does not receive any compensation for managing our business, but it is entitled to reimbursement of all direct and indirect expenses incurred on our behalf. Archrock and our General Partner are also entitled to distributions on their limited partner interest and general partner interest, respectively and, if specified requirements are met, our General Partner is entitled to distributions on its incentive distribution rights. For further discussion of our cash distribution policy, see “Cash Distribution Policy” included in Part II, Item 5 (“Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities”) of this 2017 Form 10-K.

Recent Business Developments

Proposed Merger

On January 1, 2018, we entered into the Merger Agreement pursuant to which Merger Sub will be merged with and into the Partnership with the Partnership surviving as an indirect wholly owned subsidiary of Archrock. Under the terms of the Proposed Merger Agreement, at the effective time of the Proposed Merger, each of our common units not owned by Archrock will be converted into the right to receive 1.40 shares of Archrock common stock and all of the Partnership’s incentive distribution rights, which are owned indirectly by Archrock, will be canceled and will cease to exist.

Completion of the Proposed Merger is subject to certain customary conditions, including, among others: (i) approval of the Merger Agreement by holders of a majority of the outstanding common units of the Partnership; (ii) approval of the Archrock Share Issuance by a majority of the shares of Archrock common stock present in person or represented by proxy at the special meeting of Archrock stockholders; (iii) expiration or termination of applicable waiting periods under the HSR Act (early termination of the waiting period under the HSR Act was granted on February 9, 2018); (iv) there being no law or injunction prohibiting consummation of the transactions contemplated under the Merger Agreement; (v) the effectiveness of a registration statement on Form S-4 relating to the Archrock Share Issuance; (vi) approval for listing on the New York Stock Exchange of the shares of Archrock common stock issuable pursuant to the Archrock Share Issuance; (vii) subject to specified materiality standards, the accuracy of certain representations and warranties of the other party; and (viii) compliance by the other party in all material respects with its covenants.

As a result of the completion of the Proposed Merger, our common units will no longer be publicly traded. All of our outstanding debt is expected to remain outstanding. We and Archrock expect to issue, to the extent not already in place, guarantees of the indebtedness of Archrock and the Partnership. Subject to the satisfaction or waiver of certain conditions, including the approval of the Merger Agreement by our unitholders and approval of the issuance of Archrock common stock in connection with the Proposed Merger by Archrock stockholders, the Proposed Merger is expected to close in the second quarter of 2018.

See Note 1 (“Organization and Summary of Significant Accounting Policies”) and Note 17 (“Proposed Merger”) to our Financial Statements for details of the Proposed Merger.

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~~Acquisitions~~PART I

InItem November 2016, we completed the November 2016 Contract Operations Acquisition whereby we acquired from Archrock contract operations customer service agreements with 63 customers and a fleet of 262 compressor units used to provide compression services under those agreements, comprising approximately 147,000 horsepower, or approximately 4% (of then-available horsepower) of the combined U1.S. ~~contract operations business of Archrock and us. Total consideration for the transaction was $85.0 million, excluding transaction costs.~~Business

InWe ~~March~~meet ~~2016,~~the weconditions ~~completed~~specified ~~the~~in ~~March~~General ~~2016~~Instruction ~~Acquisition~~I(1)(a) ~~whereby~~and we(b) ~~acquired~~of ~~contract~~Form ~~operations~~10-K ~~customer~~and ~~service~~are ~~agreements~~thereby ~~with~~permitted ~~four~~to ~~customers~~use ~~and~~the areduced ~~fleet~~disclosure format for wholly-owned subsidiaries of 19reporting ~~compressor~~companies ~~units~~specified ~~used~~therein. toAccordingly, ~~provide~~in ~~compression~~lieu ~~services~~of ~~under~~the ~~those~~information ~~agreements,~~called ~~comprising~~for ~~approximately~~by ~~23,000~~Part ~~horsepower~~I Item 1 “Business,” ~~for~~we have included a ~~purchase~~brief ~~price~~description of ~~$18.8~~the ~~million~~business transacted during the most recent fiscal year that in our management’s opinion indicates the general nature and scope of our business.

InWe ~~April~~are ~~2015,~~a weDelaware ~~completed~~limited ~~the~~partnership ~~April 2015~~formed ~~Contract~~in ~~Operations Acquisition whereby we acquired from Archrock contract operations customer service agreements with 60~~June ~~customers~~2006. ~~and~~On aApril ~~fleet of 238 compressor units used to provide compression services under those agreements~~26, ~~comprising approximately 148~~2018,~~000~~ ~~horsepower,~~Archrock orcompleted 3%the ~~(of~~acquisition ~~then-available horsepower)~~ of ~~the~~all ~~combined contract operations business~~ of ~~Archrock~~our ~~and~~outstanding ~~us.~~common ~~The~~units ~~acquired~~that ~~assets~~it ~~also~~did ~~included~~not ~~179~~already ~~compressor~~own ~~units~~and, ~~comprising~~as ~~approximately~~a 66result,~~000~~ ~~horsepower,~~we ~~previously~~became ~~leased~~its ~~from~~wholly-owned ~~Archrock to us~~subsidiary. ~~Total consideration for the transaction was $102.3 million, excluding transaction costs.~~

~~See~~We ~~Note 3~~are ~~(“Business~~a ~~Acquisitions”)~~leading provider of natural gas compression services to ~~our~~customers ~~Financial~~in ~~Statements~~the ~~for~~oil ~~further~~and ~~details~~natural gas industry throughout the U.S. Our business supports a must-run service that is essential to the production, processing, transportation and storage of ~~these~~natural ~~acquisitions~~gas. Our geographic diversity and large fleet of natural gas compression equipment enable us to provide reliable contract operations services to our customers throughout the U.S. We operate in one segment.

We do not have any employees. Pursuant to the Omnibus Agreement (see Note 5 (“Related Party Transactions”) to our Financial Statements), we reimburse Archrock for the allocated cost of its personnel who provide direct and indirect support for our operations.

Recent Business Developments

Merger Transaction

On April 26, 2018, Archrock completed the acquisition of all of our outstanding common units that it did not already own and, as a result, we became its wholly-owned subsidiary. Additionally, all outstanding treasury units were retired and our incentive distribution rights, all of which were owned by Archrock prior to the Merger, were canceled and ceased to exist. As a result of the Merger, our common units are no longer publicly traded. See Note 10 (“Partners’ Capital”) to our Financial Statements for further details of the Merger.

Amendment to the Credit Facility and Revolving Loan Agreement with Archrock

On April 26, 2018, in connection with the closing of the Merger and pursuant to Amendment No. 1, the aggregate revolving commitment under the Credit Facility increased from $1.1 billion to $1.25 billion. Also in conjunction with the closing of the Merger, we entered into a Revolving Loan Agreement with Archrock under which we may make loans to Archrock with borrowings from the Credit Facility. See Notes 9 (“Long-Term Debt”) and 5 (“Related Party Transactions”) to the Financial Statements for further details of Amendment No. 1 and the Revolving Loan Agreement, respectively.

Contract Operations Services Overview

We provide comprehensive contract operations services, including the personnel, equipment, tools, materials and supplies to meet our customers’ natural gas compression needs. Based on the operating specifications at the customer’s location and the customer’s unique compression needs, these services include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment. When providing contract operations services, we work closely with a customer’s field service personnel so that the compression services can be adjusted to efficiently match changing characteristics of the natural gas reservoir and the natural gas produced. We routinely repackage or reconfigure a portion of our existing fleet to adapt to our customers’ compression needs. We utilize both slow and high speed reciprocating compressors primarily driven by internal natural gas fired combustion engines. We also utilize rotary screw compressors for specialized applications.

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As mentioned above, pursuant to the Omnibus Agreement, Archrock provides us with all operational staff, corporate staff and support services necessary to run our business.

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~~Compressor~~The ~~Fleet~~following table summarizes the size and horsepower of our natural gas compressor fleet as of December 31, 2018:

We intend to continue to work with Archrock to manage our respective fleets as one pool of compression equipment from which we can each readily fulfill our respective customers’ service needs. When one of Archrock’s salespersons is advised of a new contract operations services opportunity allocable to us, he or she will obtain relevant information concerning the project, including natural gas flow, pressure and natural gas composition, and then review our and Archrock’s fleets for an available and appropriate compressor unit. In some instances, we may choose to purchase newly-fabricated equipment to fulfill our customers’ needs if no idle equipment is available in our fleet. See Part III, Item 13 (“Certain Relationships and Related Transactions and Director Independence”) of this 2017 Form 10-K for additional information regarding our ability to share or exchange compression equipment with Archrock.



	Number of Units	Aggregate Horsepower (in thousands)	% of Horsepower
0 — 1,000 horsepower per unit	4,354	1,045	30	%
1,001 — 1,500 horsepower per unit	1,228	1,650	47	%
Over 1,500 horsepower per unit	415	828	23	%
Total	5,997	3,523	100	%

The size and horsepower of our natural gas compressor fleet on December 31, 2017 is summarized in the following table:

Range of Horsepower Per Unit	Number of Units	Aggregate Horsepower (in thousands)	% of Horsepower
0 - 1,000	4,471	1,058	32	%
1,001 - 1,500	1,143	1,535	47	%
1,501 and over	349	697	21	%
Total(1)	5,963	3,290	100	%

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(1) Included three compressor units, comprising approximately 4,000 horsepower, leased from Archrock and excluded five compressor units, comprising approximately 4,000 horsepower, leased to Archrock (see Note 4 (“Related Party Transactions”) to our Financial Statements).

Over the last several years, Archrock has undertaken efforts to standardize its compressor fleet around major components and key suppliers. Because a significant portion of our fleet consists of Archrock’s former fleet, we benefit from these efforts as well. Standardization of our fleet:

• enables us to minimize our fleet operating costs and maintenance capital requirements;

• facilitates low-cost compressor resizing; and

• allows us to develop improved technical proficiency in our maintenance and overhaul operations, which enables us to achieve high run-time rates while maintaining lower operating costs.

Competitive Strengths

We believe we have the following key competitive strengths:

• Large horsepower. We believe we have the largest fleet of large horsepower equipment among all outsourced compression service providers in the U.S. At December 31, 2017, 69% of our fleet, as measured by operating horsepower, was comprised of units that exceed 1,000 horsepower per unit. We believe the trends driving demand for large horsepower units will continue. These trends include (i) high levels of associated gas production from shale which is generally produced at a lower initial pressure than dry gas wells, (ii) pad drilling which brings multiple laterals to a single well site, (iii) increasing well lateral lengths which increase natural gas flow to the wellhead and (iv) high probability drilling programs that allow for efficient surface infrastructure planning.

• Superior customer service. We operate in a relationship-driven, service-intensive industry and therefore need to provide superior customer service. We believe that our regionally-based network, local presence, experience and in-depth knowledge of our customers’ operating needs and growth plans enable us to respond to our customers’ needs and meet their evolving demands on a timely basis. In addition, we focus on achieving a high level of reliability for the services we provide in order to maximize our customers’ production levels. Our sales efforts concentrate on demonstrating our commitment to enhancing our customers’ cash flows through superior customer service.

• Large fleet in substantially all major U.S. producing regions. We operate in substantially all major oil and natural gas producing regions in the U.S. Our large fleet and numerous operating locations throughout the U.S., combined with our ability, as a result of our relationship with Archrock, to efficiently move equipment among producing regions, means that we are not dependent on production activity in any particular region. We believe our size, geographic scope and broad customer base provide us with improved operating expertise and business development opportunities.

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• Our relationship with Archrock. Our relationship with Archrock and our access to its personnel, logistical capabilities, geographic scope and operational efficiencies allow us to provide a full complement of contract operations services. We and Archrock intend to continue to manage our respective compression fleets as one pool of compression equipment from which we can more easily fulfill our respective customers’ needs. This relationship also gives us an advantage in pursuing compression opportunities throughout the U.S. As of December 31, 2017, Archrock owned approximately 557,000 horsepower of compression equipment, excluding the compression equipment owned by us, in its contract operations business. Archrock intends for us to be the primary long-term growth vehicle for its contract operations business. On January 1, 2018, we entered into the Merger Agreement with Archrock pursuant to which we will become an indirect wholly-owned subsidiary of Archrock.

• Fee-based cash flows. We charge a fixed monthly fee for our contract operations services that our customers are generally required to pay, regardless of the volume of natural gas we compress in that month. We believe this fee structure reduces volatility and enhances our ability to generate relatively stable and predictable cash flows.

Business Strategies

We intend to continue to capitalize on our competitive strengths to meet our customers’ needs through the following key strategies:

• Capitalize on the long-term fundamentals for the U.S. natural gas compression industry. We believe our ability to efficiently meet our customers’ evolving compression needs, our long-standing customer relationships and our large compressor fleet will enable us to capitalize on what we believe are favorable long-term fundamentals for the U.S. natural gas compression industry. These fundamentals include significant natural gas resources in the U.S., increased unconventional natural gas production, decreasing natural reservoir pressures, expected increased natural gas demand in the U.S. from growth in liquid natural gas exports, exports of natural gas via pipeline to Mexico, power generation and industrial uses and the continued need for compression services.

• Improve profitability. As the largest provider of natural gas compression services in the U.S., we intend to use our scale to achieve cost savings in our operations. We are also focused on increasing productivity and optimizing our processes. By using technology to make our systems and processes more efficient, we intend to lower our internal costs and improve our profitability over time. Additionally, as demand increases for our services and industry utilization rates improve for compression equipment, we believe we will have more opportunities to improve pricing and recoup some of the effects of the pricing declines we experienced during the recent downturn in the oil and gas industry.

• Grow our business to generate attractive returns. We plan to grow our business over time through the potential future acquisition of additional assets from compression providers and natural gas transporters or producers. We also plan to grow our business organically over the long term by adding new horsepower in key growth areas, including by providing compression services to producers of oil and natural gas from shale and liquids-rich plays.

• Simplify our capital structure. On January 1, 2018, we entered into the Merger Agreement with Archrock pursuant to which Archrock will acquire the public common units of the Partnership that Archrock does not already own. Should it be completed, this Proposed Merger will simplify our capital structure and is expected to result in a lower cost of equity capital over the long term.

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Natural Gas Compression Industry Overview

Natural gas compression is a mechanical process whereby the pressure of a given volume of natural gas is increased to a desired higher pressure for transportation from one point to another. It is essential to the production and transportation of natural gas. Compression is typically required several times during the natural gas production and transportation cycle, including (i) at the wellhead, (ii) throughout gathering and distribution systems, (iii) into and out of processing and storage facilities and (iv) along intrastate and interstate pipelines.

• Wellhead and Gathering Systems — Natural gas compression is used to transport natural gas from the wellhead through the gathering system. At some point during the life of natural gas wells, reservoir pressures typically fall below the line pressure of the natural gas gathering or pipeline system used to transport the natural gas to market. At that point, natural gas no longer naturally flows into the pipeline. Compression equipment is applied in both field and gathering systems to boost the pressure levels of the natural gas flowing from the well allowing it to be transported to market. Changes in pressure levels in natural gas fields require periodic changes to the size and/or type of on-site compression equipment. Additionally, compression is used to reinject natural gas into producing oil wells to maintain reservoir pressure and help lift liquids to the surface, which is known as secondary oil recovery or natural gas lift operations. Typically, these applications require low- to mid-range horsepower compression equipment located at or near the wellhead. Compression equipment is also used to increase the efficiency of a low-capacity natural gas field by providing a central compression point from which the natural gas can be produced and injected into a pipeline for transmission to facilities for further processing.

• Pipeline Transportation Systems — Natural gas compression is used during the transportation of natural gas from the gathering systems to storage or the end user. Natural gas transported through a pipeline loses pressure over the length of the pipeline. Compression is staged along the pipeline to increase capacity and boost pressure to overcome the friction and hydrostatic losses inherent in normal operations. These pipeline applications generally require larger horsepower compression equipment (1,500 horsepower and higher).

• Storage Facilities — Natural gas compression is used in natural gas storage projects for injection and withdrawals during the normal operational cycles of these facilities.

• Processing Applications — Compressors may also be used in combination with natural gas production and processing equipment to process natural gas into other marketable energy sources. In addition, compression services are used for compression applications in refineries and petrochemical plants.

Many natural gas producers, transporters and processors outsource their compression services due to the benefits and flexibility of contract compression. Changing well and pipeline pressures and conditions over the life of a well often require producers to reconfigure or replace their compressor units to optimize the well production or gathering system efficiency.

We believe outsourcing compression operations to compression service providers such as us offers customers:

• the ability to efficiently meet their changing compression needs over time while limiting the underutilization of their owned compression equipment;

• access to the compression service provider’s specialized personnel and technical skills, including engineers and field service and maintenance employees, which we believe generally leads to improved production rates and/or increased throughput;

• the ability to increase their profitability by transporting or producing a higher volume of natural gas through decreased compression downtime and reduced operating, maintenance and equipment costs by allowing the compression service provider to efficiently manage their compression needs; and

• the flexibility to deploy their capital on projects more directly related to their primary business by reducing their compression equipment and maintenance capital requirements.

We believe the U.S. natural gas compression services industry continues to have growth potential over time due to, among other things, increased natural gas production in the U.S. from unconventional sources and aging producing natural gas fields that will require more compression to continue producing the same volume of natural gas, and expected increased demand for natural gas in the U.S. for power generation, industrial uses and exports, including liquid natural gas exports and exports of natural gas via pipeline to Mexico.

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Oil and Natural Gas Industry Cyclicality and Volatility

Changes in oil and natural gas exploration and production spending normally result in changes in demand for our services; however, we believe our business is typically less impacted by commodity prices than certain other oil and natural gas service providers because:

• compression services are necessary for natural gas to be delivered from the wellhead to end users;

• the need for compression services and equipment has grown over time due to the increased production of natural gas, the natural pressure decline of natural gas producing basins and the increased percentage of natural gas production from unconventional sources; and

• our business is tied primarily to oil and natural gas production and consumption, which are generally less cyclical in nature than exploration activities.

Because we typically do not take title to the natural gas we compress, and the natural gas we use as fuel for our compressors is supplied by our customers, our direct exposure to commodity price risk is further reduced.

Seasonal Fluctuations

Our results of operations have not historically reflected any material seasonal tendencies and we currently do not believe that seasonal fluctuations will have a material impact on us in the foreseeable future.

Market and Customers

We conduct our contract operations activities in substantially all major oil and natural gas producing areas throughout the U.S.

Our current customer base consists of companies engaged in various aspects of the oil and natural gas industry, including large integrated oil and natural gas producers, processors, gatherers, transporters and storage providers.

We have entered into preferred vendor arrangements with some of our customers that give us preferential consideration for the compression needs of these customers. In exchange, we provide these customers with enhanced product availability, product support and favorable pricing.

During the years ended December 31, 2017, 2016 and 2015, Williams Partners accounted for 16%, 17% and 16% of our revenue, respectively. Additionally, during the years ended December 31, 2017, 2016 and 2015, Anadarko accounted for 10%, of our revenue. No other customer accounted for more than 10% of our revenue during these years.

Sales and Marketing

Our marketing and client service functions are coordinated and performed by Archrock sales and field service personnel. Salespeople and field service personnel regularly visit our customers to ensure customer satisfaction, determine customer needs as to services currently being provided and ascertain potential future compression services requirements. This ongoing communication allows us to quickly respond to customer requests.

General Terms of our Contract Operations Customer Service Agreements

The following discussion describes select material terms common to our standard contract operations service agreements. We typically enter into a master service agreement with each customer that sets forth the general terms and conditions of our services, and then enter into a separate supplemental service agreement for each distinct site at which we will provide contract operations services.

Term and Termination. Our customers typically contract for our contract operations services on a site-by-site basis. Following the initial minimum term for our contract operations services, which ranges from 12 to 60 months, contract operations services generally continue until terminated by either party with 30 days’ advance notice.

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Fees and Expenses. Our customers pay a fixed monthly fee for our contract operations services, which generally is based on expected natural gas volumes and pressures associated with a specific application. Our customers generally are required to pay our monthly fee even during periods of limited or disrupted natural gas flows. We are typically responsible for the costs and expenses associated with our compression equipment used to provide the contract operations services, other than fuel gas, which is provided by our customers.

Service Standards and Specifications. We provide contract operations services according to the particular specifications of each job, as set forth in the applicable contract. These are typically turn-key service contracts under which we supply all services and support and use our own compression equipment to provide the contract operations services as necessary for a particular application. In certain circumstances, if the availability of our services does not meet certain percentages specified in our contracts, our customers are generally entitled, upon request, to specified credits against our service fees.

Title and Risk of Loss. We own and retain title to or have an exclusive possessory interest in all compression equipment used to provide contract operations services and we generally bear risk of loss for such equipment to the extent the loss is not caused by gas conditions, our customers’ acts or omissions or the failure or collapse of the customer’s over-water job site upon which we provide the contract operations services.

Insurance. Typically, both we and our customers are required to carry general liability, workers’ compensation, employer’s liability, automobile and excess liability insurance. Archrock insures our property and operations and is substantially self-insured for workers’ compensation, employer’s liability, property, auto liability, general liability and employee group health claims in view of the relatively high per-incident deductibles Archrock absorbs under its insurance arrangements for these risks.

Suppliers

Prior to the Spin-off, our sole supplier of newly-fabricated equipment was Archrock. In connection with the Spin-off, we entered into a supply agreement with Exterran Corporation under which we were required to purchase our requirements of newly-fabricated compression equipment from Exterran Corporation and its affiliates, subject to certain exceptions. This supply agreement expired in November 2017 and we have since entered into new supply agreements with multiple suppliers, including Exterran Corporation, to meet our compression equipment needs.

Competition

The natural gas compression services business is highly competitive. Overall, we experience considerable competition from companies that may be able to more quickly adapt to changes within our industry and changes in economic conditions as a whole, more readily take advantage of available opportunities and adopt more aggressive pricing policies. We believe we are competitive with respect to price, equipment availability, customer service, flexibility in meeting customer needs, technical expertise and quality and reliability of our compressors and related services.

Increased size and geographic scope offer compression services providers operating and cost advantages. As the number of compression applications and size of the compression fleet increases, the number of required sales, administrative and maintenance personnel increases at a lesser rate, resulting in operational efficiencies and potential cost advantages. Additionally, broad geographic scope allows compression service providers to more efficiently provide services to all customers, particularly those with compression applications in remote locations. Our relationship with Archrock allows us to access a diverse fleet of compression equipment, a broad geographic base of operations and related operational personnel and other resources that we believe gives us more flexibility in meeting our customers’ needs than many of our competitors and allows us to efficiently manage our customers’ compression needs.

Non-competition Arrangement with Archrock

Under the Omnibus Agreement, subject to the provisions described below, Archrock has agreed not to offer or provide compression services to our contract operations services customers that are not also contract operations services customers of Archrock. Compression services include natural gas contract compression services, but exclude fabrication of compression equipment, sales of compression equipment or material, parts or equipment that are components of compression equipment, leasing of compression equipment without also providing related compression equipment service, gas processing operations services and operation, maintenance, service, repairs or overhauls of compression equipment owned by third parties. Similarly, we have agreed not to offer or provide compression services to Archrock’s contract operations services customers that are not also our contract operations services customers.

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Some of our customers are also Archrock’s contract operations services customers, which we refer to as overlapping customers. We and Archrock have agreed, subject to the exceptions described below, not to provide contract operations services to an overlapping customer at any site at which the other was providing such services to an overlapping customer on the date of the most recent amendment to the Omnibus Agreement, each being referred to as a “Partnership site” or an “Archrock site,” as applicable. Pursuant to the Omnibus Agreement, if an overlapping customer requests contract operations services at a Partnership site or an Archrock site, whether in addition to or in replacement of the equipment existing at such site on the date of the most recent amendment to the Omnibus Agreement, we may provide contract operations services if such overlapping customer is a Partnership overlapping customer, and Archrock will be entitled to provide such contract operations services if such overlapping customer is an Archrock overlapping customer. Additionally, any additional contract operations services provided to a Partnership overlapping customer will be provided by us and any additional services provided to an Archrock overlapping customer will be provided by Archrock.

Archrock has also agreed that new customers for contract compression services are for our account unless the new customer is unwilling to contract with us or unwilling to do so under our form of compression services agreement. In that case, Archrock may provide compression services to the new customer. If we or Archrock enter into a compression services contract with a new customer, either we or Archrock, as applicable, will receive the protection of the applicable non-competition arrangements described above in the same manner as if such new customer had been a compression services customer of either us or Archrock on the date of the Omnibus Agreement.

The non-competition arrangements described above do not apply to:

• our provision of contract compression services to a particular Archrock customer or customers, with the approval of Archrock;

• Archrock’s provision of contract compression services to a particular customer or customers of ours, with the approval of the conflicts committee of our board of directors;

• our purchase and ownership of not more than five percent of any class of securities of any entity that provides contract compression services to Archrock’s contract compression services customers;

• Archrock’s purchase and ownership of not more than five percent of any class of securities of any entity that provides contract compression services to our contract compression services customers;

• Archrock’s ownership of us;

• our acquisition, ownership and operation of any business that provides contract compression services to Archrock’s contract compression services customers if Archrock has been offered the opportunity to purchase the business for its fair market value from us and Archrock declines to do so. However, if neither the Omnibus Agreement nor the non-competition arrangements described above have already terminated, we will agree not to provide contract compression services to Archrock’s customers that are also customers of the acquired business at the sites at which Archrock is providing contract operations services to them at the time of the acquisition;

• Archrock’s acquisition, ownership and operation of any business that provides contract compression services to our contract operations services customers if we have been offered the opportunity to purchase the business for its fair market value from Archrock and we decline to do so with the concurrence of the conflicts committee of our board of directors. However, if neither the Omnibus Agreement nor the non-competition arrangements described above have already terminated, Archrock will agree not to provide contract operations services to our customers that are also customers of the acquired business at the sites at which we are providing contract operations services to them at the time of the acquisition; or

• a situation in which one of our customers (or its applicable business) and a customer of Archrock (or its applicable business) merge or are otherwise combined, in which case, each of we and Archrock may continue to provide contract operations services to the applicable combined entity or business without being in violation of the non-competition provisions, but Archrock and the conflicts committee of our board of directors must negotiate in good faith to implement procedures or such other arrangements, as necessary, to protect the value to each of Archrock and us of the business of providing contract operations services to each such customer or its applicable business.

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Unless the Omnibus Agreement is terminated earlier due to a change of control of Archrock GP, our General Partner or us, the non-competition provisions of the Omnibus Agreement will terminate on December 31, 2018 or on the date on which a change of control of Archrock occurs, whichever event occurs first. If a change of control of Archrock occurs, and neither the Omnibus Agreement nor the non-competition arrangements have already terminated, Archrock will agree for the remaining term of the non-competition arrangements not to provide contract operations services to our customers at any site where we are providing contract operations services at the time of the change of control.

Environmental and Other Regulations

Our operations are subject to stringent and complex U.S. federal, state and local laws and regulations governing the discharge of materials into the environment or otherwise relating to protection of the environment and to occupational safety and health. Compliance with these environmental laws and regulations may expose us to significant costs and liabilities and cause us to incur significant capital expenditures in our operations. Failure to comply with these laws and regulations may result in the assessment of administrative, civil and criminal penalties, imposition of investigatory and remedial obligations, and the issuance of injunctions delaying or prohibiting operations. We believe that our operations are in substantial compliance with applicable environmental and safety and health laws and regulations and that continued compliance with currently applicable requirements would not have a material adverse effect on us. However, the trend in environmental regulation has been to place more restrictions on activities that may affect the environment, and thus, any changes in these laws and regulations that result in more stringent and costly waste handling, storage, transport, disposal, emission or remediation requirements could have a material adverse effect on our results of operations and financial position.

The primary U.S. federal environmental laws to which our operations are subject include the CAA and regulations thereunder, which regulate air emissions; the CWA and regulations thereunder, which regulate the discharge of pollutants in industrial wastewater and storm water runoff; the RCRA and regulations thereunder, which regulate the management and disposal of hazardous and non-hazardous solid wastes; and the CERCLA and regulations thereunder, known more commonly as “Superfund,” which impose liability for the remediation of releases of hazardous substances in the environment. We are also subject to regulation under the OSHA and regulations thereunder, which regulate the protection of the safety and health of workers. Analogous state and local laws and regulations may also apply.

Air Emissions

The CAA and analogous state laws and their implementing regulations regulate emissions of air pollutants from various sources, including natural gas compressors, and also impose various monitoring and reporting requirements. Such laws and regulations may require a facility to obtain pre-approval for the construction or modification of certain projects or facilities expected to produce air emissions or result in the increase of existing air emissions, obtain and strictly comply with air permits containing various emissions and operational limitations, or utilize specific emission control technologies to limit emissions. Our standard contract operations agreement typically provides that the customer will assume permitting responsibilities and certain environmental risks related to site operations.

New Source Performance Standards

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Venting and Flaring on Federal Lands

On November 18, 2016, the BLM published final rules to reduce venting and flaring on federal and tribal lands. The rules required leak detection inspections at compressor stations and imposed requirements to reduce emissions from pneumatic controllers and pumps, among other things. On December 8, 2017, the BLM, to avoid imposing compliance costs on operators for requirements that may be rescinded or significantly revised in the near future, issued a temporary suspension or delay of certain requirements of those rules to give themselves sufficient time to review and consider revising or rescinding its requirements. Both the requirements in the rule that had yet to be implemented and certain requirements of the rule that were in effect at the time were postponed and suspended until January 17, 2019. The rule could have required us to incur material costs to comply. It is unclear at this time whether any additional changes to the rule will change the cost to us.

National Ambient Air Quality Standards

On October 1, 2015, the EPA issued a new NAAQS ozone standard of 70 ppb, which is a reduction from the 75 ppb standard set in 2008. This new standard became effective on December 28, 2015. During 2017, the states began submitting updated lists of likely attainment/non-attainment regions under the revised ozone standard utilizing air quality data collected between 2014 and 2016. In November 2017, the EPA proposed its attainment/non-attainment designations based on the states’ submissions, but notified the states in December 2017 that it will postpone finalizing those designations until the Spring of 2018 pending any additional public comment period and any air quality data from 2017 the states may wish to submit. State implementation of the revised NAAQS could result in stricter permitting requirements, delay or prohibit our customers’ ability to obtain such permits and result in increased expenditures for pollution control equipment, the costs of which could be significant.

Texas Commission on Environmental Quality

In January 2011, the TCEQ finalized revisions to certain air permit programs that significantly increase air emissions-related requirements for new and certain existing oil and gas production and gathering sites in the Barnett Shale production area. The final rule established new emissions standards for engines, which could impact the operation of specific categories of engines by requiring the use of alternative engines, compressor packages or the installation of aftermarket emissions control equipment. The rule became effective for the Barnett Shale production area in April 2011, and the lower emissions standards will become applicable between 2020 and 2030 depending on the type of engine and the permitting requirements. A number of other states where our engines are operated have adopted or are considering adopting additional regulations that could impose new air permitting or pollution control requirements for engines, some of which could entail material costs to comply. At this time, however, we cannot predict whether any such rules would require us to incur material costs.

Source Aggregation

On June 3, 2016, the EPA issued final rules under the CAA regarding criteria for aggregating multiple sites into a single source for air-quality permitting purposes applicable to the oil and gas industry. This rule could cause small facilities, such as compressor stations, on an aggregate basis, to be deemed a major source, thereby triggering more stringent air permitting requirements, which in turn could result in operational delays or require the installation of costly pollution control equipment. At this time, however, we cannot predict whether any such rules would require us to incur material costs.

General

These new regulations and proposals, when finalized, and any other new regulations requiring the installation of more sophisticated pollution control equipment or the adoption of other environmental protection measures, could have a material adverse impact on our business, financial condition, results of operations and ability to make cash distributions to our unitholders.

Climate Change Legislation and Regulatory Initiatives

The U.S. Congress has previously considered legislation to restrict or regulate emissions of greenhouse gases, such as carbon dioxide and methane. It presently appears unlikely that comprehensive federal climate legislation will become law in the near future, although energy legislation and other initiatives continue to be proposed that may be relevant to greenhouse gas emissions issues. Almost half of the states, either individually or through multi-state regional initiatives, have begun to address greenhouse gas emissions, primarily through the planned development of emission inventories or regional greenhouse gas cap and trade programs. Although most of the state-level initiatives have to date been focused on large sources of greenhouse gas emissions, such as electric power plants, it is possible that smaller sources such as our gas-fired compressors could become subject to greenhouse gas-related regulation. Depending on the particular program, we could be required to control emissions or to purchase and surrender allowances for greenhouse gas emissions resulting from our operations.

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Independent of Congress, the EPA has promulgated regulations controlling greenhouse gas emissions under its existing CAA authority. The EPA has adopted rules requiring many facilities, including petroleum and natural gas systems, to inventory and report their greenhouse gas emissions. These reporting obligations were triggered for some sites we operated in 2017.

In addition, the EPA rules provide air permitting requirements for certain large sources of greenhouse gas emissions. The requirement for large sources of greenhouse gas emissions to obtain and comply with permits will affect some of our and our customers’ largest new or modified facilities going forward, but is not expected to cause us to incur material costs.

At the international level, the United States joined the international community at the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change in Paris, France, which resulted in the Paris Agreement that requires member countries to review and ‘‘represent a progression’’ in their intended nationally determined contributions and set greenhouse gas emission reduction goals every five years beginning in 2020. The Paris Agreement entered into force in November 2016. Although this agreement does not create any binding obligations for nations to limit their greenhouse gas emissions, it does include pledges from the participating nations to voluntarily limit or reduce future emissions. In June 2017, President Trump stated that the United States intends to withdraw from the Paris Agreement, but may enter into a future international agreement related to greenhouse gases on different terms. The Paris Agreement provides for a four-year exit process beginning when it took effect in November 2016, which would result in an effective exit date of November 2020. The United States’ adherence to the exit process is uncertain and the terms on which the United States may reenter the Paris Agreement or a separately negotiated agreement are unclear at this time.

Although it is not currently possible to predict how any proposed or future greenhouse gas legislation or regulation promulgated by Congress, the states or multi-state regions will impact our business, any regulation of greenhouse gas emissions that may be imposed in areas in which we conduct business could result in increased compliance costs or additional operating restrictions or reduced demand for our services, and could have a material adverse effect on our business, financial condition, results of operations and ability to make cash distributions to our unitholders.

Water Discharges

The CWA and analogous state laws and their implementing regulations impose restrictions and strict controls with respect to the discharge of pollutants into state waters or waters of the U.S. The discharge of pollutants into regulated waters is prohibited, except in accordance with the terms of a permit issued by the EPA or an analogous state agency. In addition, the CWA regulates storm water discharges associated with industrial activities depending on a facility’s primary standard industrial classification. Several of Archrock’s facilities on which we may store inactive compression units are required to have industrial wastewater discharge permits under local wastewater ordinances, which Archrock has obtained. U.S. federal laws also require development and implementation of spill prevention, controls, and countermeasure plans, including appropriate containment berms and similar structures to help prevent the contamination of navigable waters in the event of a petroleum hydrocarbon tank spill, rupture or leak at such facilities.

Waste Management and Disposal

RCRA and analogous state laws and their implementing regulations govern the generation, transportation, treatment, storage and disposal of hazardous and non-hazardous solid wastes. During the course of our operations, we generate wastes (including, but not limited to, used oil, antifreeze, filters, sludges, paints, solvents and abrasive blasting materials) in quantities regulated under RCRA. The EPA and various state agencies have limited the approved methods of disposal for these types of wastes. CERCLA and analogous state laws and their implementing regulations impose strict, and under certain conditions, joint and several liability without regard to fault or the legality of the original conduct on classes of persons who are considered to be responsible for the release of a hazardous substance into the environment. These persons include current and past owners and operators of the facility or disposal site where the release occurred and any company that transported, disposed of, or arranged for the transport or disposal of the hazardous substances released at the site. Under CERCLA, such persons may be subject to joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment, for damages to natural resources and for the costs of certain health studies. In addition, where contamination may be present, it is not uncommon for neighboring landowners and other third parties to file claims for personal injury, property damage and recovery of response costs allegedly caused by hazardous substances or other pollutants released into the environment.

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While we do not own any material facilities or properties, we use Archrock’s properties for the storage and maintenance and repair of inactive compressor units and lease some properties used in support of our operations. Although we have utilized operating and disposal practices that were standard in the industry at the time, hydrocarbons, hazardous substances, or other regulated wastes may have been disposed of or released on or under the properties used or leased by us or on or under other locations where such materials have been taken for disposal by companies sub-contracted by us. In addition, many of these properties have been previously owned or operated by third parties whose treatment and disposal or release of hydrocarbons, hazardous substances or other regulated wastes was not under our control. These properties and the materials released or disposed thereon may be subject to CERCLA, RCRA and analogous state laws. Under such laws, we could be required to remove or remediate historical property contamination, or to perform certain operations to prevent future contamination. At certain of such sites, Archrock is currently working with the prior owners who have undertaken to monitor and clean up contamination that occurred prior to Archrock’s acquisition of these sites. We are not currently under any order requiring that we undertake or pay for any cleanup activities. However, we cannot provide any assurance that we will not receive any such order in the future.

Occupational Safety and Health

We are subject to the requirements of OSHA and comparable state statutes. These laws and the implementing regulations strictly govern the protection of the safety and health of employees. The OSHA hazard communication standard, the EPA community right-to-know regulations under Title III of CERCLA and similar state statutes require that we organize and/or disclose information about hazardous materials used or produced in our operations.

Indemnification for Environmental Liabilities

Under the Omnibus Agreement, Archrock has agreed to indemnify us, for a three-year period following each applicable asset acquisition from Archrock, against certain potential environmental claims, losses and expenses associated with the ownership and operation of the acquired assets that occur before the acquisition date. Archrock’s maximum liability for environmental indemnification obligations under the Omnibus Agreement cannot exceed $5 million, and Archrock will not have any obligation under the environmental or any other indemnification until our aggregate losses exceed $250,000. Archrock will have no indemnification obligations with respect to environmental claims made as a result of additions to or modifications of environmental laws promulgated after such acquisition date. We have agreed to indemnify Archrock against environmental liabilities occurring on or after the applicable acquisition date related to our assets to the extent Archrock is not required to indemnify us.

Employees and Labor Relations

We do not have any employees. Under the Omnibus Agreement, we reimburse Archrock for the allocated costs of its personnel who provide direct or indirect support for our operations. Archrock considers its employee relations to be good.

Available Information

Our website address is www.archrock.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports are available on our website, without charge, as soon as reasonably practicable after they are filed electronically with the SEC. Information on our website is not incorporated by reference in this 2017 Form 10-K or any of our other securities filings. Paper copies of our filings are also available, without charge, from Archrock Partners, L.P., 9807 Katy Freeway, Suite 100, Houston, Texas 77024, Attention: Investor Relations. Alternatively, the public may read and copy any materials we file with the SEC at its Public Reference Room at 100 F Street, NE, Washington, DC 20549. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330. The SEC also maintains a website that contains reports, proxy and information statements and other information regarding issuers who file electronically with the SEC. The SEC’s website address is www.sec.gov.

Additionally, we make available free of charge on our website:

• the Code of Business Conduct of Archrock GP; and

• the charters of the audit, conflicts and compensation committees of Archrock GP.

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Item 1A. Risk Factors

As described in ~~Part I (~~“~~Disclosure Regarding~~ Forward-Looking Statements”),” this ~~2017~~2018 Form 10-K contains forward-looking statements regarding us, our business and our industry. The risk factors described below, among others, could cause our actual results to differ materially from the expectations reflected in the forward-looking statements. If any of the following risks actually ~~occurs~~occur, our business, financial condition, and results of operations ~~and our ability to make cash distributions to our unitholders~~ could be negatively impacted.

~~The~~We ~~Proposed~~qualify ~~Merger~~as isa ~~subject~~Heavy toEquipment ~~conditions,~~Dealer ~~including~~for ~~some~~ad ~~conditions~~valorem ~~that~~tax ~~may~~purposes ~~not~~under berevised ~~satisfied~~Texas onstatutes. aIf ~~timely~~in ~~basis,~~the iffuture atwe ~~all.~~do ~~Failure~~not toqualify ~~complete~~as ~~the~~a ~~Proposed~~Heavy ~~Merger,~~Equipment Dealer or ~~significant~~our ~~delays~~compressors indo ~~completing~~not ~~the~~qualify ~~Proposed~~as ~~Merger,~~Heavy ~~could~~Equipment ~~negatively~~because ~~affect~~of ~~our~~new ~~business~~or ~~and~~revised ~~financial~~Texas ~~results~~statutes, ~~and~~we ~~the~~will ~~trading~~incur ~~prices~~additional oftaxes, which would adversely impact our ~~common~~results ~~units~~of operations and financial condition.

~~The~~In ~~completion~~2011, of the ~~Proposed~~Texas ~~Merger~~Legislature isenacted ~~subject~~changes related to athe ~~number~~appraisal of ~~conditions.~~natural ~~The~~gas ~~completion~~compressors offor ad valorem tax purposes by expanding the ~~Proposed~~definitions ~~Merger~~of is“Heavy ~~not~~Equipment ~~assured~~Dealer” and is“Heavy ~~subject~~Equipment” toeffective ~~risks,~~from ~~including~~ the ~~risk~~beginning ~~that~~of ~~Archrock~~2012. ~~stockholder~~If ~~approval~~legislation is enacted in Texas that repeals or ~~our~~alters ~~unitholder~~the ~~approval~~Heavy isEquipment ~~not~~Statutes ~~obtained.~~such ~~Further,~~that in the ~~Proposed~~future ~~Merger~~we ~~may~~do not bequalify ~~completed~~as ~~even~~a ifHeavy ~~the~~Equipment ~~Archrock~~Dealer ~~stockholder~~or ~~approval~~our ~~and~~compressors ~~our~~do ~~unitholder~~not ~~approval~~qualify ~~are~~as ~~obtained.~~Heavy ~~The~~Equipment, ~~Merger~~then ~~Agreement~~we ~~contains~~would ~~conditions,~~likely ~~some~~be ofrequired ~~which~~to ~~are~~pay ~~beyond~~additional ~~our~~ad ~~control,~~valorem ~~that~~taxes going forward, ifwhich ~~not~~would ~~satisfied~~increase orour ~~waived,~~quarterly ~~may~~cost ~~prevent~~of sales expense, ~~delay~~thereby orimpacting ~~otherwise~~our ~~result~~future inresults ~~the~~of ~~Proposed~~operations ~~Merger~~and ~~not~~financial ~~occurring~~condition.

If the Proposed Merger is not completed, or if there are significant delays in completing the Proposed Merger, Archrock’s and our future business and financial results and the trading price of our common units could be negatively affected, and each of the parties will be subject to several risks, including the following:

• the parties may be liable for fees or expenses to one another under the terms and conditions of the Merger Agreement;

• there may be negative reactions from the financial markets due to the fact that current prices of our common units may reflect a market assumption that the Proposed Merger will be completed; and

• the attention of our management will have been diverted to the Proposed Merger rather than their own operations and pursuit of other opportunities that could have been beneficial to their respective businesses.

Because the exchange ratio is fixed and because the market price of Archrock common stock will fluctuate prior to the completion of the Proposed Merger, our unitholders cannot be sure of the market value of the Archrock common stock they will receive as merger consideration relative to the value of our common units they exchange.

The market value of the consideration that our unitholders will receive in the Proposed Merger will depend on the trading price of Archrock common stock at the closing of the Proposed Merger. The exchange ratio that determines the number of shares of Archrock common stock that our unitholders will receive in the Proposed Merger is fixed at 1.40 shares of Archrock common stock for each common unit. This means that there is no mechanism contained in the Merger Agreement that would adjust the number of shares of Archrock common stock that our unitholders will receive based on any decreases or increases in the trading price of Archrock common stock. Stock or unit price changes may result from a variety of factors (many of which are beyond Archrock’s and our control), including:

•changes in Archrock’s or our business, operations and prospects;

•changes in market assessments of Archrock’s or our business, operations and prospects;

•changes in market assessments of the likelihood that the Proposed Merger will be completed;

• interest rates, commodity prices, general market, industry and economic conditions and other factors generally affecting the price of Archrock common stock or our common units; and

• federal, state and local legislation, governmental regulation and legal developments in the businesses in which Archrock and we operate.

If the price of Archrock common stock at the closing of the Proposed Merger is less than the price of Archrock common stock on the date that the Merger Agreement was signed, then the market value of the merger consideration will be less than contemplated at the time the Merger Agreement was signed.

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When our common unitholders receive the merger consideration depends on the completion date of the Proposed Merger, which is uncertain.

Completing the Proposed Merger is subject to several conditions, not all of which are controllable by us. Accordingly, even if the Proposed Merger is approved by our unitholders, the date on which our unitholders will receive merger consideration depends on the completion date of the Proposed Merger, which is uncertain and subject to several other closing conditions.

We may incur substantial transaction-related costs in connection with the Merger.

We expect to incur substantial expenses in connection with completing the Proposed Merger, including fees paid to legal, financial and accounting advisors, filing fees, proxy solicitation costs and printing costs. Many of the expenses that will be incurred, by their nature, are difficult to estimate accurately at the present time.

Certain executive officers and directors of Archrock GP have interests in the Proposed Merger that are different from, or in addition to, the interests they may have as unitholders which could have influenced their decision to support or approve the Proposed Merger.

Certain executive officers and directors of Archrock GP own equity interests in Archrock, receive fees and other compensation from Archrock, and will have rights to ongoing indemnification and insurance coverage by the surviving company that give them interests in the Proposed Merger that may be different from, or be in addition to, interests of an unaffiliated unitholder.

Financial projections by the Partnership may not prove to be reflective of actual future results.

In connection with the Proposed Merger, we prepared and considered, among other things, internal financial forecasts for the Partnership. These forecasts speak only as of the date made and will not be updated. These financial projections were not provided with a view to public disclosure, are subject to significant economic, competitive, industry and other uncertainties and may not be achieved in full, at all or within projected time frames. In addition, the failure of businesses to achieve projected results could have a material adverse effect on Archrock's share price, financial position and ability to maintain or increase its dividends following the Proposed Merger.

We may be unable to obtain the regulatory clearances required to complete the Proposed Merger or, in order to do so, we may be required to comply with material restrictions or satisfy material conditions.

The Proposed Merger is subject to review by the Antitrust Division and the Federal Trade Commission, under the HSR Act. On February 9, 2018, the Antitrust Division and the Federal Trade Commission granted early termination of the waiting period under the HSR Act. The closing of the Proposed Merger is subject to the condition precedent that there is no law, injunction, judgment or ruling by a governmental authority in effect enjoining, restraining, preventing or prohibiting the consummation of the transactions contemplated by the Merger Agreement or making the consummation of the transactions contemplated by the Merger Agreement illegal.

Additionally, state attorneys general could seek to block or challenge the Proposed Merger as they deem necessary or desirable in the public interest at any time, including after completion of the transaction. In addition, in some circumstances, a third party could initiate a private action under antitrust laws challenging or seeking to enjoin the Proposed Merger, before or after it is completed. Archrock may not prevail and may incur significant costs in defending or settling any action under the antitrust laws.

Risks Related to Our Business

We may not have sufficient cash from operations following the establishment of cash reserves and payment of fees and expenses, including cost reimbursements to our General Partner, to enable us to make cash distributions to our unitholders at our current distribution rate.

The amount of cash distributions are determined by our board of directors on a quarterly basis. In order to pay cash distributions at the current rate, we will require available cash of approximately $20.5 million per quarter, based on the number of common and general partner units outstanding on December 31, 2017. In light of current market conditions, we may not have sufficient available cash from operating surplus each quarter to enable us to make cash distributions at our current distribution rate or at all. The amount of cash we can distribute on our units principally depends upon the amount of cash we generate from our operations, which will fluctuate from quarter to quarter based on, among other things, the risks described in this section.

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In addition, the actual amount of cash we will have available for distribution will depend on other factors, including:

• the level of capital expenditures we make;

• the cost of acquisitions;

• the rates we charge for our compression services;

• the level of demand for our compression services;

• the creditworthiness of our customers;

• our debt service requirements and other liabilities;

• fluctuations in our working capital needs;

• our ability to refinance our debt in the future or borrow funds and access capital markets;

• restrictions contained in our debt agreements; and

• the amount of cash reserves established by our General Partner.

Failure to generate sufficient cash flow, together with the absence of alternative sources of capital, could adversely impact our results of operations and cash available for distribution to our unitholders, which could limit our ability to make cash distributions to our unitholders at our current distribution rate.

We are engaged in ongoing litigation regarding our qualification as a Heavy Equipment Dealer, the qualification of our natural gas compressors as Heavy Equipment and the resulting appraisal of our natural gas compressors for ad valorem tax purposes, as well as the location where our natural gas compressors are taxable, under revised Texas statutes. If this litigation is resolved against us, or if in the future we do not qualify as a Heavy Equipment Dealer or our compressors do not qualify as Heavy Equipment because of new or revised Texas statutes, we will incur additional taxes and could be subject to substantial penalties and interest, which would adversely impact our results of operations and cash available for distribution.

In 2011, the Texas Legislature enacted changes related to the appraisal of natural gas compressors for ad valorem tax purposes by expanding the definitions of “Heavy Equipment Dealer” and “Heavy Equipment” effective from the beginning of 2012. Under the revised Heavy Equipment Statutes, we believe we are a Heavy Equipment Dealer, that our natural gas compressors are Heavy Equipment and that we, therefore, are required to file our ad valorem taxes under this new methodology. We further believe that our natural gas compressors are taxable under the Heavy Equipment Statutes in the counties where we maintain a business location and keep natural gas compressors instead of where the compressors may be located on January 1 of a tax year. A large number of appraisal review boards denied our position, although some accepted it, and we filed petitions for review in the appropriate district courts with respect to the 2012 through 2017 tax years. See Part I, Item 3 (“Legal Proceedings”) and Note 15 (“Commitments and Contingencies”) to our Financial Statements for additional information regarding legal proceedings to which we are a party, including ongoing litigation regarding our qualification as a Heavy Equipment Dealer, the qualification of our natural gas compressors as Heavy Equipment and the resulting appraisal of our natural gas compressors for ad valorem tax purposes, as well as the location where our natural gas compressors are taxable, under revised Texas statutes.

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As a result of the new methodology, our ad valorem tax expense (which is reflected in our consolidated statements of operations as a component of cost of sales (excluding depreciation and amortization)) includes a benefit of $16.1 million during the year ended December 31, 2017. Since the change in methodology became effective in 2012, we have recorded an aggregate benefit of $66.2 million as of December 31, 2017, of which $13.1 million has been agreed to by a number of appraisal review boards and county appraisal districts and $53.1 million has been disputed and is currently in litigation. Recognizing the similarity of the issues and that these cases will ultimately be resolved by the Texas appellate courts, we have reached, or intend to reach, agreements with some of the appraisal districts to stay or abate certain of these pending district court cases. If we are unsuccessful in our litigation, we would be required to pay ad valorem taxes up to the aggregate benefit we have recorded, and the additional ad valorem tax payments may also be subject to substantial penalties and interest. In addition, while we do not expect the ultimate determination of the issue of where the natural gas compressors are taxable under the Heavy Equipment Statutes would have an impact on the amount of taxes due, we could be subject to substantial penalties if we are unsuccessful on this issue. Also, if we are unsuccessful in our litigation, or if legislation is enacted in Texas that repeals or alters the Heavy Equipment Statutes such that in the future we do not qualify as a Heavy Equipment Dealer or our compressors do not qualify as Heavy Equipment, then we would likely be required to pay these ad valorem taxes under the old methodology going forward, which would increase our quarterly cost of sales expense up to approximately the amount of our then most recent quarterly benefit recorded and which, in turn, would negatively impact our future results of operations, financial condition and ability to make cash distributions to our unitholders.

We have a substantial amount of debt that could limit our ability to fund future growth and operations and increase our exposure to risk during adverse economic conditions.

At December 31, ~~2017~~2018, we had $1.45 billion in outstanding debt obligations net of unamortized debt discounts and unamortized deferred financing costs. Many factors, including factors beyond our control, may affect our ability to make payments on our outstanding indebtedness. These factors include those discussed elsewhere in these Risk Factors and those listed in “~~Disclosure Regarding~~ Forward-Looking Statements” ~~included in Part I~~ of this ~~2017~~2018 Form 10-K.

Our substantial debt and associated commitments could have important adverse consequences. For example, these commitments could:


•	make it more difficult for us to satisfy our contractual obligations;


•	increase our vulnerability to general adverse economic and industry conditions;


•	limit our ability to fund future working capital, capital expenditures, acquisitions or other corporate requirements;

• increase our vulnerability to interest rate fluctuations because the interest payments on a portion of our debt are based upon variable interest rates and a portion can adjust based ~~upon~~on our credit statistics;


•	limit our flexibility in planning for, or reacting to, changes in our business and our industry;

• place us at a disadvantage compared to our competitors that have less debt or less restrictive covenants in such debt; and

• limit our ability to refinance our debt in the future or borrow additional funds~~; and~~.

~~• limit our ability to maintain our cash distributions to unitholders.~~9

Covenants under our Debt Agreements may impair our ability to operate our business.

Our Debt Agreements contain various covenants with which we must comply, including, but not limited to, restrictions on the use of proceeds from borrowings and limitations on our ability to incur additional indebtedness, engage in transactions with affiliates, merge or consolidate, sell assets, make certain investments and acquisitions, make loans, grant liens, repurchase equity and pay dividends and distributions. The Credit Facility also contains various covenants requiring mandatory prepayments from the net cash proceeds of certain asset transfers. In addition, if as of any date we have cash (other than proceeds from a debt or equity issuance in the 30 days prior to such date reasonably expected to be used to fund an acquisition permitted under the Credit Facility) in excess of $50.0 million, then such excess amount will be used to pay down outstanding borrowings of a corresponding amount under the Credit Facility.

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EBITDA to Interest Expense	2.5 to 1.0
Senior Secured Debt to EBITDA	3.5 to 1.0
Total Debt to EBITDA
Through fiscal year 2017	5.95 to 1.0
Through fiscal year 2018	5.75 to 1.0
Through second quarter of 2019	5.50 to 1.0
Thereafter (1)	5.25 to 1.0

Covenants under our Debt Agreements may impair our ability to operate our business.

Our Debt Agreements contain various covenants with which we must comply, including, but not limited to, restrictions on the use of proceeds from borrowings and limitations on our ability to incur additional indebtedness, engage in transactions with affiliates, merge or consolidate, sell assets, make certain investments and acquisitions, make loans, grant liens, repurchase equity and pay distributions. The Credit Facility also contains various covenants requiring mandatory prepayments from the net cash proceeds of certain asset transfers. In addition, if as of any date we have cash (other than proceeds from a debt or equity issuance in the 30 days prior to such date reasonably expected to be used to fund an acquisition permitted under the Credit Facility) in excess of $50.0 million, then such excess amount will be used to pay down outstanding borrowings of a corresponding amount under the Credit Facility.

The Credit Facility is also subject to financial covenants, including the following ratios, as defined in the Credit Facility agreement:



EBITDA to Interest Expense	2.5 to 1.0
Senior Secured Debt to EBITDA	3.5 to 1.0
Total Debt to EBITDA
Through fiscal year 2018	5.95 to 1.0
Through fiscal year 2019	5.75 to 1.0
Through second quarter of 2020	5.50 to 1.0
Thereafter ⁽¹⁾	5.25 to 1.0

——————

(1) Subject to a temporary increase to 5.5 to 1.0 for any quarter during which an acquisition ~~meeting~~satisfying certain thresholds is completed and for the ~~following~~ two quarters ~~after~~immediately ~~the~~following ~~quarter~~such ~~in which the acquisition closes~~quarter.

If we were to anticipate non-compliance with these financial ratios, we may take actions to maintain compliance with them, including a reduction in general and administrative expenses, ~~our capital expenditures~~ or ~~the payment of cash distributions at~~ our ~~current~~capital ~~distribution rate~~expenditures. Any of these measures could have an adverse effect on our operations, ~~cash flows~~ and ~~the~~cash ~~price of our common units~~flows. If we fail to remain in compliance with our financial covenants we would be in default under the Credit Facility.

The breach of any of our covenants could result in a default under one or more of our Debt Agreements, which would trigger cross-default provisions under our other Debt Agreements, which would accelerate our obligation to repay our indebtedness under those agreements. If the repayment obligations on any of our indebtedness were to be accelerated, we may not be able to repay the debt or refinance the debt on acceptable terms, and our financial position would be materially adversely affected. A material adverse effect on our assets, liabilities, financial condition, business or operations that, taken as a whole, impacts our ability to perform our obligations under the Debt Agreements could lead to a default under those agreements.

As of December 31, ~~2017~~2018, we were in compliance with all financial covenants under the Debt Agreements.

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Uncertainty relating to the LIBOR calculation process and potential phasing out of LIBOR after 2021 may adversely affect the market value of our current or future debt obligations, including the Notes and the Credit Facility.

Regulators and law enforcement agencies in the United Kingdom and elsewhere are conducting civil and criminal investigations into whether the banks that contributed to the BBA in connection with the calculation of daily LIBOR may have been under-reporting or otherwise manipulating or attempting to manipulate LIBOR. A number of BBA member banks have entered into settlements with their regulators and law enforcement agencies with respect to this alleged manipulation of LIBOR. Actions by the BBA or any other administrator of LIBOR, regulators or law enforcement agencies may result in changes to the manner in which LIBOR is determined, the phasing out of LIBOR or the establishment of alternative reference rates. For example, on July 27, 2017, the U.K. Financial Conduct Authority announced that it intends to stop persuading or compelling banks to submit LIBOR rates after 2021. As a result, LIBOR may be discontinued by 2021. Furthermore, in the United States, efforts to identify a set of alternative U.S. dollar reference interest rates that could replace LIBOR include proposals by the Alternative Reference Rates Committee of the Federal Reserve Board and the Federal Reserve Bank of New York. At this time, it is not possible to predict whether any such changes will occur, whether LIBOR will be phased out or any such alternative reference rates or other reforms to LIBOR will be enacted in the United Kingdom, the United States or elsewhere or the effect that any such changes, phase out, alternative reference rates or other reforms, if they occur, would have on the amount of interest paid on, or the market value of, our current or future debt obligations, including the Notes and the Credit Facility. Uncertainty as to the nature of such potential changes, phase out, alternative reference rates or other reforms may materially adversely affect the trading market for LIBOR-based securities, including the Notes, as well as the terms of the Credit Facility and any interest rate swaps or other derivative agreements to which we are a party. Reform of, or the replacement or phasing out of, LIBOR and proposed regulation of LIBOR and other “benchmarks” may materially adversely affect the market value of, the applicable interest rate on and the amount of interest paid on our current or future debt obligations, including the Notes and the Credit Facility. In addition, even if we have entered into interest rate swaps or other derivative instruments for purposes of managing our interest rate exposure, our hedging strategies may not be effective as a result of the replacement or phasing out of LIBOR and other “benchmarks” and we may incur substantial losses as a result.

The erosion of the financial condition of our customers could adversely affect our business.

Many of our customers finance their exploration and production activities through cash flow from operations, the incurrence of debt or the issuance of equity. During times when the oil or natural gas markets weaken, our customers are more likely to experience a downturn in their financial condition. Additionally, some of our midstream customers may provide their gathering, transportation and related services to a limited number of companies in the oil and gas production business. A reduction in borrowing bases under reserve-based credit facilities, the lack of availability of debt or equity financing or other factors that negatively impact our customers’ financial condition could result in a reduction in our customers’ spending for our services, which may result in their cancellation of contracts or their determination not to enter into new natural gas compression service contracts. Furthermore, the loss by our midstream customers of their key customers could reduce demand for their services and result in a deterioration of their financial condition, which would in turn decrease their demand for our services. Reduced demand for our services could adversely affect our business, financial condition, and results of operations ~~and ability to make cash distributions to our unitholders~~. In addition, in the event of the financial failure of a customer, we could experience a loss on all or a portion of our outstanding accounts receivable associated with that customer.

We depend on Williams Partners and Anadarko for a significant portion of our revenue. The loss of our business with Williams Partners or Anadarko or the inability or failure of Williams Partners or Anadarko to meet their payment obligations may adversely affect our financial results.

During the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, Williams Partners accounted for 1614%, 1716% and 1617%, respectively, of our revenue. During ~~each of~~ the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, Anadarko accounted for 9%, 10% and 10%, respectively, of our revenue. There is no guarantee that, upon the expiration of our existing services agreements with Williams Partners or Anadarko, Williams Partners ~~will choose to renew~~ or Anadarko will choose to renew these existing services agreements or enter into similar agreements with us. The loss of business with Williams Partners or Anadarko, unless offset by additional contract compression services revenue from other customers, or the inability or failure of Williams Partners or Anadarko to meet their payment obligations under contractual arrangements, could have a material adverse effect on our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

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The loss of any of our most significant customers would result in a decline in our revenue and ~~cash~~could ~~available~~adversely toaffect ~~pay distributions to~~ our ~~common~~financial ~~unitholders~~results.

Our five most significant customers collectively accounted for ~~approximately~~33%, 37% and 41% of our revenue for ~~each of~~ the years ended December 31, 2018, 2017 and 2016, respectively. Our services are provided to these customers pursuant to contract compression services agreements, which typically have an initial term of ~~twelve-~~12 to 60 months and continue thereafter until terminated by either party with 30 days’ advance notice. The loss of all or even a portion of the services we provide to these customers, as a result of competition or otherwise, could have a material adverse effect on our business, results of operations, ~~financial condition,~~ and ~~our~~financial ~~ability to make cash distributions to our unitholders~~condition.

Many of our contract operations services contracts have short initial terms and are cancelable on short notice after the initial term, and we cannot be sure that such contracts will be extended or renewed after the end of the initial contractual term. Any such nonrenewals, or renewals at reduced rates or the loss of contracts with any significant customer could adversely impact our ~~results~~financial ~~of operations and cash available for distribution~~results.

The length of our contract operations services contracts with customers varies based on operating conditions and customer needs. Our initial contract terms typically are not long enough to enable us to recoup the cost of acquiring the equipment we use to provide contract operations services, and these contracts are typically cancelable on short notice after the initial term. We cannot be sure that a substantial number of these contracts will be extended or renewed by our customers or that any of our customers will continue to contract with us. The inability to negotiate extensions or renew a substantial portion of our contract operations services contracts, the renewal of such contracts at reduced rates, the inability to contract for additional services with our customers or the loss of all or a significant portion of our services contracts with any significant customer could lead to a reduction in revenue and net income and could require us to record additional asset impairments. This could have a material adverse effect upon our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

Our inability to fund purchases of additional compression equipment could adversely impact our ~~results~~financial ~~of operations and cash available for distribution~~results.

We may not be able to maintain or grow our asset and customer base unless we have access to sufficient capital to purchase additional compression equipment. Cash flow from our operations and availability under our Credit Facility may not provide us with sufficient cash to fund our capital expenditure requirements, including any funding requirements related to acquisitions. Additionally, pursuant to our Partnership Agreement, we intend to distribute all of our “available cash,” as defined in our Partnership Agreement, to Archrock, as the holder of all of our ~~unitholders~~outstanding common units, on a quarterly basis. Therefore, a significant portion of our cash flow from operations will be used to fund such distributions. As a result, we intend to fund our growth capital expenditures and acquisitions with external sources of capital including additional borrowings under our Credit Facility and/or ~~public~~transactions orwith private ~~offerings of equity or debt~~investors. Our ability to grow our asset and customer base could be impacted by any limits on our ability to access ~~equity~~additional ~~and debt~~ capital.

We may be unable to access the capital and credit markets or borrow on affordable terms to obtain additional capital that we may require.

Historically, we have financed acquisitions, operating expenditures and capital expenditures with a combination of cash provided by operating and financing activities. However, to the extent we are unable to finance our operating expenditures, capital expenditures, scheduled interest and debt repayments and future cash distributions with net cash provided by operating activities and borrowings under our Credit Facility, we may require additional capital. Periods of instability in the capital and credit markets (both generally and in the oil and gas industry in particular) could limit our ability to access these markets to raise ~~debt or equity~~ capital on affordable terms or to obtain additional financing. Among other things, our lenders may seek to increase interest rates, enact tighter lending standards, refuse to refinance existing debt at maturity at favorable terms or at all and may reduce or cease to provide funding to us. If we are unable to access the capital and credit markets on favorable terms, or if we are not successful in raising capital within the time period required or at all, we may not be able to grow or maintain our business, which could have a material adverse effect on our business, results of operations and financial condition ~~and could limit our ability to make cash distributions to our unitholders at our current distribution rate~~.

24If we do not make acquisitions on economically acceptable terms, our future growth could be limited.

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If we do not make acquisitions on economically acceptable terms, our future growth and our ability to maintain distributions to our unitholders could be limited.

Our ability to grow depends, in part, on our ability to make accretive acquisitions. If we are unable to make accretive acquisitions either because we are (i) unable to identify attractive acquisition candidates or negotiate acceptable purchase contracts with them, (ii) unable to obtain financing for these acquisitions on economically acceptable terms or (iii) outbid by competitors, then our future growth and ability to maintain distributions could be limited. Furthermore, even if we make acquisitions that we believe will be accretive, these acquisitions may nevertheless result in a decrease in the cash generated from operations per unit.

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Any acquisition involves potential risks, including, among other things:


•	an inability to integrate successfully the businesses we acquire;


•	the assumption of unknown liabilities;


•	limitations on rights to indemnity from the seller;


•	mistaken assumptions about the cash generated or anticipated to be generated by the business acquired or the overall costs of equity or debt;


•	the diversion of management’s attention from other business concerns;


•	unforeseen operating difficulties; and


•	customer or key employee losses at the acquired businesses.

If we consummate any future acquisitions, our capitalization and results of operations may change significantly, and ~~unitholders~~Archrock, as our sole unitholder, will not have the opportunity to evaluate the economic, financial and other relevant information that we will consider in determining the application of our future funds and other resources. In addition, competition from other buyers could reduce our acquisition opportunities or cause us to pay a higher price than we might otherwise pay.

Our reliance on Archrock as an operator of our assets and our limited ability to control certain costs could have a material adverse effect on our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

Pursuant to the Omnibus Agreement, Archrock provides us with all administrative and operational services, including all operations, marketing, maintenance and repair, periodic overhauls of compression equipment, inventory management, legal, accounting, treasury, insurance administration and claims processing, risk management, health, safety and environmental, information technology, human resources, credit, payroll, internal audit, taxes, facilities management, investor relations, enterprise resource planning system, training, executive, sales, business development and engineering services necessary to run our business. Our operational success and ability to execute our growth strategy depends significantly upon Archrock’s satisfactory operation of our assets and performance of these services. Our reliance on Archrock as an operator of our assets and our resulting limited ability to control certain costs could have a material adverse effect on our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

Due to our significant relationship with Archrock, adverse developments concerning Archrock, as well as Archrock’s decreased size following the Spin-off, could adversely affect us, even if we have not suffered any similar developments.

~~Through~~As ~~its~~a ~~subsidiaries,~~result ~~Archrock owns all~~ of ~~our general partner interests, including all of~~ the ~~incentive distribution rights~~Merger, ~~and~~we are a ~~significant~~wholly-owned ~~amount~~subsidiary of ~~our limited partner interests~~Archrock. Our access to Archrock’s personnel, logistical capabilities, geographic scope and operational efficiencies allows us to provide a full complement of contract operations services. In addition, we benefit from a number of arrangements in the Omnibus Agreement between us and Archrock (see Note 45 (“Related Party Transactions”) to our Financial Statements for further discussion of the Omnibus Agreement). A material adverse effect upon Archrock’s assets, liabilities, financial condition, business or operations could impact Archrock’s ability to continue to provide these benefits to us. As a result, we could experience a material adverse effect upon our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition, even if we have not suffered any similar developments.

25Following the closing of the Spin-off, certain of Archrock’s fabrication operations, logistical capabilities, geographic scope and operational efficiencies were contributed to Exterran Corporation, and certain of Archrock’s key personnel became employees of Exterran Corporation. As a result, Archrock is a smaller and less diversified company with more limited financial resources and operational capabilities. Archrock’s status as a smaller company and loss of these capabilities and key personnel could have a material adverse effect upon our business, results of operations and financial condition.

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Following the closing of the Spin-off, certain of Archrock’s fabrication operations, logistical capabilities, geographic scope and operational efficiencies were contributed to Exterran Corporation, and certain of Archrock’s key personnel became employees of Exterran Corporation. As a result, Archrock is a smaller and less diversified company with more limited financial resources and operational capabilities, and Archrock may be unable or unwilling to provide us with certain financial and operational support that it was able or willing to provide to us prior to the Spin-off. Archrock’s status as a smaller company and loss of these capabilities and key personnel could have a material adverse effect upon our business, results of operations, financial condition and ability to make cash distributions to our unitholders.

We depend on particular suppliers and are vulnerable to product shortages and price increases. With respect to our suppliers of newly-fabricated compression equipment specifically, we occasionally experience long lead times, and therefore may at times make purchases in anticipation of future business. If we are unable to purchase compression equipment (or other integral equipment, materials and services) from third party suppliers, we may be unable to retain existing customers or compete for new customers, which could have a material adverse effect on our business, results of operations and financial condition.

Some equipment, materials and services used in our business are obtained from a ~~single source or a~~ limited group of suppliers. Our reliance on these suppliers involves several risks, including price increases, inferior quality and a potential inability to obtain an adequate supply of such equipment, materials and services in a timely manner. Additionally, we occasionally experience long lead times from our suppliers of newly-fabricated compression equipment and may at times make purchases in anticipation of future business. We do not have long-term contracts with some of these suppliers, and the partial or complete loss of certain of these sources could have a negative impact on our results of operations and could damage our customer relationships. Further, a significant increase in the price of such equipment, materials and services could have a negative impact on our results of operations.

If we are unable to purchase compression equipment in particular on a timely basis to meet the demands of our customers, our existing customers may terminate their contractual relationships with us, or we may not be able to compete for business from new or existing customers, which, in each case, could have a material adverse effect on our business, results of operations and financial condition.

~~Because~~A wesubstantial ~~own a larger~~ portion of our ~~and~~cash ~~Archrock’s~~flow ~~combined~~must ~~pool~~be ofused ~~idle~~to ~~compression~~service ~~equipment~~our ~~than~~debt ~~in prior years~~obligations, weand ~~expect~~future ~~that~~interest ~~our~~rate ~~maintenance~~increases ~~capital expenditures will increase, which~~ could reduce the amount of our cash available for ~~distribution~~other investments in our business.

~~Archrock~~At ~~manages~~December 31, ~~its~~2018, ~~and~~we ~~our~~had ~~respective~~$1.5 ~~fleets~~billion asin ~~one~~outstanding ~~pool~~debt ofobligations, ~~compression~~net ~~equipment~~of ~~from~~unamortized ~~which~~debt wediscounts ~~can~~and ~~each~~unamortized ~~readily~~deferred ~~fulfill~~financing ~~our~~costs, ~~respective~~consisting ~~customers’~~of ~~service needs~~$344.1 ~~When~~million weoutstanding orunder ~~Archrock~~our ~~are~~6% ~~advised~~senior ofnotes adue ~~contract~~October ~~operations services opportunity~~2022, ~~Archrock~~$345.9 ~~reviews~~million ~~both~~outstanding under our ~~and~~6% ~~its~~senior ~~fleet~~notes ~~for~~due anApril 2021 ~~available~~ and ~~appropriate compressor unit~~$839.5 ~~Given~~million ~~that~~outstanding ~~the~~under ~~majority~~our ofCredit ~~the~~Facility. ~~idle~~Our ~~compression~~Credit ~~equipment~~Facility ~~has~~requires ~~historically~~that ~~been~~we ~~held~~make bymandatory ~~Archrock,~~prepayments ~~much~~ of the ~~idle~~revolving ~~compression~~loan ~~equipment~~balance ~~required~~with ~~for~~the ~~these~~net ~~contract~~cash ~~operations~~proceeds ~~services~~of ~~opportunities~~certain ~~has~~asset ~~been held by Archrock~~transfers. ~~Under~~Borrowings ~~the~~under ~~Omnibus~~our ~~Agreement,~~Credit ~~the~~Facility ~~owner~~bear ofinterest ~~the~~at ~~equipment~~variable ~~being~~rates. ~~transferred~~We ishave ~~required~~effectively tofixed ~~pay~~a ~~the~~portion ~~costs~~of ~~associated with making~~ the ~~idle~~variable ~~equipment~~rate ~~suitable~~debt ~~for~~through the ~~proposed~~use ~~customer~~of ~~and~~interest ~~then~~rate ~~has~~swaps; ~~generally~~however, ~~leased~~changes ~~the~~in ~~equipment~~economic toconditions ~~the~~could ~~recipient~~result ofin ~~the~~higher ~~equipment~~interest orrates, ~~exchanged~~thereby ~~the~~increasing ~~equipment~~our ~~for~~interest ~~other~~expense ~~equipment~~and ofreducing ~~the~~our ~~recipient.~~funds ~~Since~~available ~~Archrock~~for ~~has~~capital ~~historically owned the majority of such equipment~~investment, ~~Archrock~~operations ~~has~~or ~~generally~~distributions ~~had~~ to ~~bear~~Archrock. aAs ~~larger portion~~ of ~~the~~December 31, ~~maintenance~~2018, ~~capital~~after ~~expenditures~~taking ~~associated~~into ~~with~~consideration ~~making~~interest ~~transferred~~rate ~~equipment~~swaps, ~~ready~~we ~~for~~had ~~service~~$339.5 ~~For~~million ~~equipment~~of outstanding indebtedness that iswas ~~then~~effectively ~~leased~~subject to ~~the~~variable ~~recipient,~~interest ~~the~~rates. ~~maintenance~~A ~~capital~~1% ~~cost~~increase isin ~~a component of~~ the ~~lease~~effective interest rate ~~that~~on ~~is paid under the lease. Because we currently own 56% of~~ our ~~and~~outstanding ~~Archrock’s~~debt ~~combined~~subject ~~pool~~to ofvariable ~~idle~~interest ~~compression~~rates ~~equipment~~at ~~by horsepower~~December 31, we2018 ~~expect~~would ~~that~~result ~~more~~in ofan ~~our~~annual ~~equipment~~increase ~~will~~in ~~be available to satisfy~~ our orinterest ~~Archrock’s~~expense ~~customer~~of ~~requirements~~$3.4 Asmillion. aAny ~~result,~~such weincrease ~~expect~~in ~~that~~ our ~~maintenance~~interest ~~capital~~expense ~~expenditures~~could ~~will~~reduce ~~increase,~~the ~~which~~amount ~~could~~of ~~reduce~~cash ~~our~~we ~~cash~~have available for ~~distribution~~other investments in our business.

A substantial portion of our cash flow must be used to service our debt obligations, and future interest rate increases could reduce the amount of our cash available for distribution.

At December 31, 2017, we had $1.4 billion in outstanding debt obligations, net of unamortized debt discounts and unamortized deferred financing costs, consisting of $342.6 million outstanding under our 6% senior notes due October 2022, $344.1 million outstanding under our 6% senior notes due April 2021 and $674.3 million outstanding under our Credit Facility. Our Credit Facility requires that we make mandatory prepayments of the term loan with the net cash proceeds of certain asset transfers. Borrowings under our Credit Facility bear interest at floating rates. We have effectively fixed a portion of the floating rate debt through the use of interest rate swaps; however, changes in economic conditions could result in higher interest rates, thereby increasing our interest expense and reducing our funds available for capital investment, operations or distributions to our unitholders. As of December 31, 2017, after taking into consideration interest rate swaps, we had $174.3 million of outstanding indebtedness that was effectively subject to floating interest rates. A 1% increase in the effective interest rate on our outstanding debt subject to floating interest rates at December 31, 2017 would result in an annual increase in our interest expense of $1.7 million. Any such increase in our interest expense could reduce the amount of cash we have available for distribution.

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Our agreement not to compete with Archrock could limit our ability to grow.

We have entered into an Omnibus Agreement with Archrock and several of its subsidiaries. The Omnibus Agreement includes certain agreements not to compete between us and our affiliates, on the one hand, and Archrock and its affiliates, on the other hand. This agreement not to compete with Archrock could limit our ability to grow. For further discussion of the Omnibus Agreement, see Note 45 (“Related Party Transactions”) to our Financial Statements.

We face significant competitive pressures that may cause us to lose market share and harm our financial performance.

Our business is highly competitive and there are low barriers to entry. Our competitors may be able to ~~adapt~~ more quickly adapt to technological changes within our industry and changes in economic and market conditions as a whole, more readily take advantage of acquisitions and other opportunities and adopt more aggressive pricing policies. Our ability to renew or replace existing contracts with our customers at rates sufficient to maintain current revenue and cash flows could be adversely affected by the activities of our competitors. If our competitors substantially increase the resources they devote to the development and marketing of competitive services or substantially decrease the prices at which they offer their services, we may not be able to compete effectively.

In addition, we could face significant competition from new entrants into our industry. Some of our existing competitors or new entrants may expand or fabricate new compressor units that would create additional competition for the services we provide to our customers. In addition, our customers may purchase and operate their own compressor fleets in lieu of using our natural gas compression services. We also may not be able to take advantage of certain opportunities or make certain investments because of our debt levels and our other obligations. Any of these competitive pressures could have a material adverse effect on our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

~~We may not be able to grow our cash flows if we do not expand our business, which could limit our ability to maintain distributions to our unitholders.~~14

Our ability to grow the per-unit distribution on our units is dependent in part upon our ability to expand our business. Our future growth will depend upon a number of factors, some of which we cannot control. These factors include our ability to:

• consummate accretive acquisitions;

• enter into contracts for new services with our existing customers or new customers; and

• obtain required financing for our existing and new operations.

A deficiency in any of these factors could adversely affect our ability to achieve growth in the level of our cash flows or realize benefits from acquisitions.

Archrock continues to own and operate a contract operations business, competition from which could adversely impact our results of operations and cash available for distribution.

Archrock and its affiliates, other than us, are prohibited from competing directly or indirectly with us with respect to certain of our existing customers and certain locations where we currently conduct business, and with respect to any new contract compression services customer that approaches either Archrock or ourselves, until the earlier of December 31, 2018, a change of control of Archrock or our General Partner, or the removal or withdrawal of our General Partner. Otherwise, Archrock is not prohibited from owning assets or engaging in businesses that compete directly or indirectly with us. Archrock continues to own and operate a contract operations business, including natural gas compression, and continues to engage in aftermarket services activities. Archrock is an established participant in the contract operations business and has significant resources, including idle compression equipment, operating personnel, vendor relationships and experience, which factors may make it challenging for us to compete with it with respect to commercial activities as well as for acquisition opportunities. As a result, competition from Archrock could adversely impact our results of operations and cash available for distribution.

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Our ability to manage and grow our business effectively may be adversely affected if Archrock loses management or operational personnel.

Our officers are also officers or employees of Archrock. Additionally, we do not have any of our own employees, but rather rely on Archrock’s employees to operate our business and, following the closing of the Spin-off, certain of Archrock’s key personnel became employees of Exterran Corporation. We believe that Archrock’s ability to hire, train and retain qualified personnel will continue to be challenging and important as we grow. The supply of experienced operational and field personnel, in particular, decreases as other energy companies’ needs for the same personnel increase. Our ability to grow and to continue our current level of service to our customers will be adversely impacted if Archrock is unable to successfully hire, train and retain these important personnel.

Our operations entail inherent risks that may result in substantial liability. We do not insure against all potential losses and could be seriously harmed by unexpected liabilities.

Our operations entail inherent risks including equipment defects, malfunctions and failures and natural disasters, which could result in uncontrollable flows of natural gas or well fluids, fires and explosions. These risks may expose us, as an equipment operator, to liability for personal injury, wrongful death, property damage, pollution and other environmental damage. Archrock insures our property and operations against many of these risks; however, the insurance it carries may not be adequate to cover our claims or losses. InArchrock’s ~~addition~~insurance coverage includes property damage, general liability and commercial automobile liability and other coverage we believe is appropriate. Additionally, Archrock is substantially self-insured for workers’ compensation, ~~employer’s liability, property, auto liability, general liability~~ and employee group health claims in view of the relatively high per-incident deductibles it absorbs under its insurance arrangements for these risks. Further, insurance covering the risks we expect to face or in the amounts we desire may not be available in the future or, if available, the premiums may not be commercially justifiable. If we were to incur substantial liability and such damages were not covered by insurance or were in excess of policy limits, or if we were to incur liability at a time when we are not able to obtain liability insurance, our business, results of operations, and financial condition ~~and ability to make cash distributions to our unitholders~~ could be negatively impacted.

We indirectly depend on particular suppliers and are vulnerable to product shortages and price increases, which could have a negative impact on our results of operations.

Some of the parts and components used in our compressors are obtained by Archrock from a ~~single source or a~~ limited group of suppliers. Archrock’s reliance on these suppliers involves several risks, including price increases, inferior component quality and a potential inability to obtain an adequate supply of required components in a timely manner. Archrock does not have long-term contracts with some of these suppliers, and its partial or complete loss of certain of these suppliers could have a negative impact on our results of operations and could damage our customer relationships. As a result, a significant increase in the price of one or more of these components could have a negative impact on our results of operations.

Threats of cyber attacks or terrorism could affect our business.

We may be threatened by problems such as cyber attacks, computer viruses or terrorism that may disrupt our operations and harm our operating results. Our industry requires the continued operation of sophisticated information technology systems and network infrastructure. Despite our implementation of security measures, our technology systems are vulnerable to disability or failures due to hacking, viruses, acts of war or terrorism and other causes. If our information technology systems were to fail and we were unable to recover in a timely way, we might be unable to fulfill critical business functions, which could have a material adverse effect on our business, results of operations, ~~financial condition~~ and ~~ability~~financial ~~to make cash distributions to our unitholders~~condition.

In addition, our assets may be targets of terrorist activities that could disrupt our ability to service our customers. We may be required by our regulators or by the future terrorist threat environment to make investments in security that we cannot currently predict. The implementation of security guidelines and measures and maintenance of insurance, to the extent available, addressing such activities could increase costs. These types of events could materially adversely affect our business and results of operations. In addition, these types of events could require significant management attention and resources, and could adversely affect our reputation among customers and the public.

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From time to time, we are subject to various claims, tax audits, litigation and other proceedings that could ultimately be resolved against us, requiring material future cash payments or charges, which could impair our financial condition or results of operations.

The size, nature and complexity of our business make us susceptible to various claims, tax audits, litigation and binding arbitration proceedings. We are currently, and may in the future become, subject to various claims, which, if not resolved within amounts we have accrued, could have a material adverse effect on our financial position, results of operations or cash flows~~, including our ability to make cash distributions to our unitholders~~. Similarly, any claims, even if fully indemnified or insured, could negatively impact our reputation among our customers and the public, and make it more difficult for us to compete effectively or obtain adequate insurance in the future. See Part I, Item 3 (“Legal Proceedings”) and ~~also~~ Note 1517 (“Commitments and Contingencies”) to our Financial Statements for additional information regarding certain legal proceedings to which we are a party.

U.S. federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing as well as governmental reviews of such activities could result in increased costs and additional operating restrictions or delays in the completion of oil and natural gas wells and adversely affect demand for our contract operations services.

Hydraulic fracturing is an important and common practice that is used to stimulate production of natural gas and/or oil from dense subsurface rock formations. We do not perform hydraulic fracturing, but many of our customers do. Hydraulic fracturing involves the injection of water, sand or alternative proppant and chemicals under pressure into target geological formations to fracture the surrounding rock and stimulate production. Hydraulic fracturing is typically regulated by state agencies, but recently, there has been increased public concern regarding an alleged potential for hydraulic fracturing to adversely affect drinking water supplies, and proposals have been made to enact separate U.S. federal, state and local legislation that would increase the regulatory burden imposed on hydraulic fracturing.

For example, at the U.S. federal level, the EPA issued an Advance Notice of Proposed Rulemaking to collect data on chemicals used in hydraulic fracturing operations under Section 8 of the Toxic Substances Control Act and proposed regulations under the ~~CWA~~Clean Water Act governing wastewater discharges from hydraulic fracturing and certain other natural gas operations. On March 26, 2015, the BLM released a final rule that updates existing regulation of hydraulic fracturing activities on U.S. federal lands, including requirements for chemical disclosure, wellbore integrity and handling of flowback water. The final rule never went into effect due to pending litigation and on December 28, 2017, the BLM announced that it had rescinded the 2015 final rule, in part citing a review that found that 32 of the 32 states with federal oil and gas leases have regulations that already address hydraulic fracturing.

At the state level, several states have adopted or are considering legal requirements that could impose more stringent permitting, disclosure and well construction requirements on hydraulic fracturing activities. For example in May 2013, the Texas Railroad Commission adopted new rules governing well casing, cementing and other standards for ensuring that hydraulic fracturing operations do not contaminate nearby water resources. Local governments may also seek to adopt ordinances within their jurisdictions regulating the time, place and manner of drilling activities in general or hydraulic fracturing activities in particular or prohibit the performance of well drilling in general or hydraulic fracturing in particular. If new or more stringent U.S. federal, state or local legal restrictions relating to the hydraulic fracturing process are adopted in areas where our natural gas exploration and production customers operate, those customers could incur potentially significant added costs to comply with such requirements, experience delays or curtailment in the pursuit of exploration, development or production activities and perhaps even be precluded from drilling wells. Any such restrictions could reduce demand for our contract operations services, and as a result could have a material adverse effect on our business, financial condition, and results of operations ~~and ability to make cash distributions to our unitholders~~.

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New regulations, proposed regulations and proposed modifications to existing regulations under the CAA, if implemented, could result in increased compliance costs.

On June 3, 2016, the EPA issued final regulations amending the NSPS for the oil and natural gas source category and applying to sources of emissions of methane and VOC from certain processes, activities and equipment that is constructed, modified or reconstructed after September 18, 2015. Specifically, the regulation contains both methane and VOC standards for several emission sources not ~~currently~~previously covered by the NSPS, such as fugitive emissions from compressor stations and pneumatic pumps and methane standards for certain emission sources that are already regulated for VOC, such as equipment leaks at natural gas processing plants. The amendments also establish methane standards for a subset of equipment that the current NSPS regulates, including reciprocating compressors and pneumatic controllers, and extend the current VOC standards to the remaining unregulated equipment. In June 2017, the EPA ~~published~~proposed aand ~~proposed~~took ~~rule~~public tocomment ~~stay~~on ~~certain~~a ~~portions~~two-year stay of the ~~June~~fugitive ~~2016~~emissions ~~standards~~requirements, ~~for~~well ~~two~~site ~~years~~pneumatic standards and ~~reevaluate~~closed ~~the~~vent ~~entirety~~certification. The EPA sought additional comment in November 2017 in support of the ~~2016~~proposed ~~standards~~rule, but has not finalized the two-year stay. In October 2018, the EPA ~~has~~proposed ~~not~~targeted ~~yet~~deregulatory ~~published~~amendments ato ~~final~~the 2016 rule ~~and,~~intended asto astreamline ~~result~~implementation, ~~the~~reduce ~~June~~duplicative ~~2016~~EPA ~~rule~~and ~~remains~~state inrequirements ~~effect~~and ~~but~~decrease ~~future~~the ~~implementation~~burden of ~~the~~compliance. ~~2016~~The ~~standards~~EPA ishas ~~uncertain~~not atyet ~~this~~issued ~~time~~a final rule, but anticipates doing so in the second quarter of 2019. It is also anticipated that the EPA will attempt to make additional deregulatory changes to the NSPS going forward. The EPA has announced that it is reviewing the rule more broadly to propose amendments to address key policy issues, such as the regulation of methane, in this sector. The EPA has not announced the timing of this rule. At this time, we do not believe the rule will have a material adverse impact on our business, financial condition, and results of operations ~~or cash flows~~.

On November 18, 2016, the BLM published final rules to reduce venting and flaring on federal and tribal lands. The rules ~~required~~set forth some novel requirements regarding leak detection inspections at compressor stations and imposed requirements to reduce emissions from pneumatic controllers and pumps, among other things. OnIn ~~December~~September 82018, ~~2017,~~ the BLM, tofinalized ~~avoid imposing compliance costs on operators for requirements that may be rescinded or significantly revised in the near future, issued~~ a ~~temporary~~rule ~~suspension or delay of certain requirements of those rules to give themselves sufficient time to review and consider revising or~~ rescinding ~~its requirements. Both~~ the novel requirements inpertaining ~~the rule that had yet~~ to bewaste-minimization ~~implemented~~plans, ~~and~~gas-capture ~~certain~~percentages, ~~requirements~~well ofdrilling, ~~the~~well ~~rule~~completion ~~that were in effect at the time were postponed~~ and ~~suspended~~related ~~until~~operations, ~~January~~pneumatic 17controllers, ~~2019. The~~pneumatic ~~rule could~~diaphragm ~~have~~pumps, ~~required~~storage usvessels toand ~~incur~~leak ~~material~~detection ~~costs~~and ~~to comply~~repair. ItThe isBLM ~~unclear~~also atrevised ~~this~~other ~~time~~provisions ~~whether~~related ~~any additional changes~~ to ~~the~~venting ~~rule~~and ~~will change the cost to us~~flaring.

On October 1, 2015, the EPA issued a new NAAQS ozone standard of 70 ppb, which is a reduction from the 75 ppb standard set in 2008. This new standard became effective on December 28, 2015~~. During 2017~~, and the ~~states~~EPA ~~began~~completed ~~submitting~~designating ~~updated lists of likely~~ attainment/non-attainment regions under the revised ozone standard ~~utilizing~~in ~~air quality data collected between 2014 and 2016~~2018. In November ~~2017~~2016, the EPA proposed ~~its~~an ~~attainment/non-attainment~~implementation ~~designations~~rule ~~based~~for on the ~~states’~~2015 ~~submissions~~NAAQS ozone standard, but ~~notified~~ the ~~states~~agency inhas ~~December~~yet ~~2017~~to ~~that~~issue ita ~~will~~final ~~postpone~~implementation ~~finalizing those designations until the Spring of 2018 pending any additional public comment period and any air quality data from 2017 the states may wish to submit~~rule. State implementation of the revised NAAQS could result in stricter permitting requirements, delay or prohibit our customers’ ability to obtain such permits and result in increased expenditures for pollution control equipment, the costs of which could be significant. By law, the EPA must review each NAAQS every five years. In June 2018, the EPA announced that it has begun the process of reviewing the 2015 NAAQS ozone standard for the purposes of revising the standard. The agency has stated that it intends to keep the 70 ppb standard, but it has launched a fast-track review of the standard under new internal guidelines. The EPA has asked for information related to adverse effects that may result from various strategies for attainment and maintenance of NAAQS and is considering re-evaluating the extent to which the EPA can or should consider levels of background ozone when choosing a standard. The EPA expects to conclude the review by October 2020 as required by law. At this time, however, we cannot predict whether state implementation of the 2015 NAAQS ozone standard or the 2020 NAAQS ozone standard would have a material adverse impact on our business, financial condition and results of operations.

In January 2011, the ~~TCEQ~~Texas Commission on Environmental Quality finalized revisions to certain air permit programs that significantly increase air emissions-related requirements for new and certain existing oil and gas production and gathering sites in the Barnett Shale production area. The final rule established new emissions standards for engines, which could impact the operation of specific categories of engines by requiring the use of alternative engines, compressor packages or the installation of aftermarket emissions control equipment. The rule became effective for the Barnett Shale production area in April 2011, and the lower emissions standards will become applicable between 2020 and 2030 depending on the type of engine and the permitting requirements. A number of other states where our engines are operated have adopted or are considering adopting additional regulations that could impose new air permitting or pollution control requirements for engines, some of which could entail material costs to comply. At this ~~point~~time, however, we cannot predict whether any such rules would require us to incur material costs.

~~Finally,~~These onnew ~~June~~regulations ~~3, 2016, the EPA issued final rules under the CAA regarding criteria for aggregating multiple sites into a single source for air-quality permitting purposes applicable to the oil~~ and ~~gas industry. This rule could cause small facilities~~proposals, ~~such~~when ~~as compressor stations~~finalized, onand anany ~~aggregate~~other ~~basis,~~new toregulations berequiring ~~deemed~~the ainstallation ~~major~~of ~~source, thereby triggering~~ more ~~stringent~~sophisticated ~~air~~pollution ~~permitting~~control ~~requirements,~~equipment ~~which in turn could result in operational delays~~ or ~~require~~ the ~~installation~~adoption of ~~costly~~other ~~pollution~~environmental ~~control~~protection ~~equipment. At this time~~measures, ~~however,~~could wehave ~~cannot~~a ~~predict~~material ~~whether~~adverse ~~any~~impact ~~such~~on ~~rules~~our ~~will~~business, ~~require~~financial uscondition toand ~~incur~~results ~~material~~of ~~costs~~operations.

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We are subject to a variety of governmental regulations; failure to comply with these regulations may result in administrative, civil and criminal enforcement measures and changes in these regulations could increase our costs or liabilities.

We are subject to a variety of U.S. federal, state and local laws and regulations, including relating to the environment, health and safety and taxation. Many of these laws and regulations are complex, change frequently, are becoming increasingly stringent, and the cost of compliance with these requirements can be expected to increase over time. Failure to comply with these laws and regulations may result in a variety of administrative, civil and criminal enforcement measures, including assessment of monetary penalties, imposition of remedial requirements and issuance of injunctions as to future compliance. From time to time, as part of our operations, including newly acquired operations, we may be subject to compliance audits by regulatory authorities in the various states in which we operate.

Environmental laws and regulations may, in certain circumstances, impose strict liability for environmental contamination, which may render us liable for remediation costs, natural resource damages and other damages as a result of our conduct that was lawful at the time it occurred or the conduct of, or conditions caused by, prior owners or operators or other third parties. In addition, where contamination may be present, it is not uncommon for neighboring land owners and other third parties to file claims for personal injury, property damage and recovery of response costs. Remediation costs and other damages arising as a result of environmental laws and regulations, and costs associated with new information, changes in existing environmental laws and regulations or the adoption of new environmental laws and regulations could be substantial and could negatively impact our financial condition, profitability and results of operations. Moreover, failure to comply with these environmental laws and regulations may result in the imposition of administrative, civil and criminal penalties and the issuance of injunctions delaying or prohibiting operations.

We may need to apply for or amend facility permits or licenses from time to time with respect to storm water or wastewater discharges, waste handling, or air emissions relating to manufacturing activities or equipment operations, which subjects us to new or revised permitting conditions that may be onerous or costly to comply with. In addition, certain of our customer service arrangements may require us to operate, on behalf of a specific customer, petroleum storage units such as underground tanks or pipelines and other regulated units, all of which may impose additional compliance and permitting obligations.

We conduct operations at numerous facilities in a wide variety of locations across the continental U.S. The operations at many of these facilities require environmental permits or other authorizations. Additionally, natural gas compressors at many of our customers’ facilities require individual air permits or general authorizations to operate under various air regulatory programs established by rule or regulation. These permits and authorizations frequently contain numerous compliance requirements, including monitoring and reporting obligations and operational restrictions, such as emission limits. Given the large number of facilities in which we operate, and the numerous environmental permits and other authorizations that are applicable to our operations, we may occasionally identify or be notified of technical violations of certain requirements existing in various permits or other authorizations. Occasionally, we have been assessed penalties for our non-compliance, and we could be subject to such penalties in the future.

We routinely deal with natural gas, oil and other petroleum products. Hydrocarbons or other hazardous substances or wastes may have been disposed or released on, under or from properties used by us to provide contract operations services or inactive compression storage or on or under other locations where such substances or wastes have been taken for disposal. These properties may be subject to investigatory, remediation and monitoring requirements under environmental laws and regulations.

The modification or interpretation of existing environmental laws or regulations, the more vigorous enforcement of existing environmental laws or regulations, or the adoption of new environmental laws or regulations may also negatively impact oil and natural gas exploration and production, gathering and pipeline companies, including our customers, which in turn could have a negative impact on us.

Climate change legislation and regulatory initiatives could result in increased compliance costs.

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At the international level, the United States joined the international community at the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change in Paris, France, which resulted in the Paris Agreement that requires member countries to review and ‘‘represent a progression’’ in their intended nationally determined contributions, and set greenhouse gas emission reduction goals every five years beginning in 2020. The Paris Agreement entered into force in November 2016. Although this agreement does not create any binding obligations for nations to limit their greenhouse gas emissions, it does include pledges from the participating nations to voluntarily limit or reduce future emissions. In June 2017, President Trump stated that the United States intends to withdraw from the Paris Agreement, but may enter into a future international agreement related to greenhouse gases on different terms. The Paris Agreement provides ~~for~~an ~~a four-year~~ exit process, ~~beginning~~which ~~when~~dictates itthat ~~took~~the ~~effect~~United inStates cannot formally announce its plan to withdraw until November ~~2016~~2019, which would ~~result~~then be followed by a one-year waiting period, resulting in an effective exit date of no earlier than November 2020. The United States’ adherence to the exit process is uncertain and~~/or~~ the terms on which the United States may reenter the Paris Agreement or a separately negotiated agreement are unclear at this time.

Although it is not currently possible to predict how any proposed or future greenhouse gas legislation or regulation promulgated by Congress, the states or multi-state regions will impact our business, any regulation of greenhouse gas emissions that may be imposed in areas in which we conduct business could result in increased compliance costs or additional operating restrictions or reduced demand for our services, and could have a material adverse effect on our business, financial condition, and results of operations ~~and ability to make cash distributions to our unitholders~~.

Risks Inherent in an Investment in Our Common Units

Archrock controls our General Partner, which has sole responsibility for conducting our business and managing our operations. Archrock has conflicts of interest, which may permit it to favor its own interests to our unitholders’ detriment.

Archrock owns and controls our General Partner. Our executive officers are officers of Archrock. Therefore, conflicts of interest may arise between Archrock and its affiliates, including our General Partner, on the one hand, and us and our unitholders, on the other hand. In resolving these conflicts of interest, our General Partner may favor its own interests and the interests of its affiliates over the interests of our unitholders. These conflicts include, among others, the following situations:

• neither our Partnership Agreement nor any other agreement requires Archrock to pursue a business strategy that favors us. Archrock’s directors and officers have a fiduciary duty to make these decisions in the best interests of the owners of Archrock, which may be contrary to our interests;

• our General Partner controls the interpretation and enforcement of contractual obligations between us and our affiliates, on the one hand, and Archrock, on the other hand, including provisions governing administrative services, acquisitions and transfers of compression equipment and non-competition provisions;

• our General Partner controls whether we agree to acquire additional contract operations customers or assets from Archrock that are offered to us by Archrock and the terms of any such acquisition;

• our General Partner is allowed to take into account the interests of parties other than us, such as Archrock and its affiliates, in resolving conflicts of interest;

• other than as provided in our Omnibus Agreement with Archrock, Archrock and its affiliates are not limited in their ability to compete with us. Archrock will continue to engage in contract operations services as well as third-party sales coupled with aftermarket service contracts and may, in certain circumstances, compete with us with respect to any future acquisition opportunities;

• Archrock’s contract operations services business may compete with us for idle compression equipment and Archrock is under no obligation to offer equipment to us for purchase or use;

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• all of the officers and employees of Archrock who provide services to us also will devote significant time to the business of Archrock, and will be compensated by Archrock for the services rendered to it;

• our General Partner has limited its liability and reduced its fiduciary duties, and has also restricted the remedies available to our unitholders for actions that, without the limitations, might constitute breaches of fiduciary duty;

• our General Partner determines the amount and timing of any asset purchases and sales, borrowings, issuance of additional partnership securities and reserves, each of which can affect the amount of cash that is distributed to unitholders;

• our General Partner determines the amount and timing of any capital expenditures and whether a capital expenditure is a maintenance capital expenditure, which reduces operating surplus, or a growth capital expenditure, which does not reduce operating surplus. This determination can affect the amount of cash that is distributed to our unitholders;

• our General Partner determines which costs incurred by it and its affiliates are reimbursable by us and Archrock determines the allocation of shared overhead expenses;

• our Partnership Agreement does not restrict our General Partner from causing us to pay it or its affiliates for any services rendered to us or entering into additional contractual arrangements with any of these entities on our behalf;

• our General Partner intends to limit its liability regarding our contractual and other obligations and, in some circumstances, is entitled to be indemnified by us;

• our General Partner may exercise its limited right to call and purchase common units if it and its affiliates own more than 80% of the common units; and

• our General Partner decides whether to retain separate counsel, accountants or others to perform services for us.

Cost reimbursements due to our General Partner and its affiliates for services provided, which are determined by our General Partner, are substantial and reduce our cash available for distribution to our unitholders.

Pursuant to our Omnibus Agreement, Archrock receives reimbursement for the payment of operating expenses related to our operations and for the provision of various general and administrative services for our benefit. Payments for these services are substantial and reduce the amount of cash available for distribution to unitholders. In addition, under Delaware partnership law, our General Partner has unlimited liability for our obligations, such as our debts and environmental liabilities, except for our contractual obligations that are expressly made without recourse to our General Partner. To the extent our General Partner incurs obligations on our behalf, we are obligated to reimburse or indemnify it. If we are unable or unwilling to reimburse or indemnify our General Partner, our General Partner may take actions to cause us to make payments of these obligations and liabilities. Any such payments could reduce the amount of cash otherwise available for distribution to our unitholders.

Our Partnership Agreement limits our General Partner’s fiduciary duties to holders of our common units and restricts the remedies available to holders of our common units for actions taken by our General Partner that might otherwise constitute breaches of fiduciary duty.

Our Partnership Agreement contains provisions that reduce the fiduciary standards to which our General Partner would otherwise be held by state fiduciary duty laws. For example, our Partnership Agreement:

• permits our General Partner to make a number of decisions in its individual capacity, as opposed to in its capacity as our General Partner. This entitles our General Partner to consider only the interests and factors that it desires, and it has no duty or obligation to give any consideration to any interest of, or factors affecting, us, our affiliates or any limited partner. Examples include the exercise of its limited call right, the exercise of its rights to transfer or vote the units it owns, the exercise of its registration rights and its determination whether or not to consent to any merger or consolidation of the partnership or amendment to our Partnership Agreement;

• provides that our General Partner will not have any liability to us or our unitholders for decisions made in its capacity as the sole general partner so long as it acted in good faith, meaning it believed the decision was in the best interests of our partnership;

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• generally provides that affiliated transactions and resolutions of conflicts of interest not approved by the conflicts committee of our board of directors acting in good faith and not involving a vote of unitholders must be on terms no less favorable to us than those generally being provided to or available from unrelated third parties or must be “fair and reasonable” to us, as determined by our General Partner in good faith and that, in determining whether a transaction or resolution is “fair and reasonable,” our General Partner may consider the totality of the relationships between the parties involved, including other transactions that may be particularly advantageous or beneficial to us;

• provides that our General Partner and its officers and directors will not be liable for monetary damages to us, our limited partners or assignees for any acts or omissions unless there has been a final and non-appealable judgment entered by a court of competent jurisdiction determining that the General Partner or those other persons acted in bad faith or engaged in fraud or willful misconduct or, in the case of a criminal matter, acted with knowledge that the conduct was criminal; and

• provides that in resolving conflicts of interest, it will be presumed that in making its decision the General Partner acted in good faith, and in any proceeding brought by or on behalf of any limited partner or us, the person bringing or prosecuting such proceeding will have the burden of overcoming such presumption.

Holders of our common units have limited voting rights and are not entitled to elect our General Partner or its general partner’s directors, which could reduce the price at which the common units will trade.

Unlike the holders of common stock in a corporation, unitholders have only limited voting rights on matters affecting our business and, therefore, limited ability to influence management’s decisions regarding our business. Unitholders do not elect our General Partner or its general partner’s board of directors, and have no right to elect our General Partner or its general partner’s board of directors on an annual or other continuing basis. Our board of directors is chosen by its sole member, a subsidiary of Archrock. Furthermore, if the unitholders are dissatisfied with the performance of our General Partner, they have little ability to remove our General Partner. As a result of these limitations, the price at which the common units trade could be diminished because of the absence or reduction of a takeover premium in the trading price.

Even if holders of our common units are dissatisfied, they cannot currently remove our General Partner without its consent.

Unitholders are unable to remove our General Partner without its consent because our General Partner and its affiliates own sufficient units to be able to prevent its removal. The vote of the holders of at least 66 2/3% of all outstanding common units voting together as a single class is required to remove our General Partner. As of December 31, 2017, our General Partner and its affiliates owned 41% of our aggregate outstanding common units.

Control of our General Partner may be transferred to a third party without unitholder consent.

Our General Partner, which is indirectly wholly owned by Archrock, may transfer its general partner interest to a third party in a merger, or in a sale of all or substantially all of its assets without the consent of the unitholders. Furthermore, our Partnership Agreement does not restrict the ability of Archrock, the owner of our General Partner, from transferring all or a portion of its ownership interest in our General Partner to a third party. The new owners of our General Partner would then be in a position to replace the board of directors and officers of our General Partner’s general partner with its own choices and thereby influence the decisions taken by the board of directors and officers.

We may issue additional units without unitholder approval, which would dilute our unitholders’ existing ownership interests.

Our Partnership Agreement does not limit the number of additional limited partner interests that we may issue at any time without the approval of our unitholders. The issuance of additional common units or other equity securities of equal or senior rank by us will have the following effects:

• our unitholders’ proportionate ownership interest in us will decrease;

• the amount of cash available for distribution on each unit may decrease;

• the ratio of taxable income to distributions may increase;

• the relative voting strength of each previously outstanding unit may be diminished; and

• the market price of the common units may decline.

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Our Partnership Agreement restricts the voting rights of unitholders owning 20% or more of our common units, other than our General Partner and its affiliates, including Archrock.

Unitholders’ voting rights are further restricted by our Partnership Agreement provision providing that any units held by a person that owns 20% or more of any class of units then outstanding, other than our General Partner, its affiliates, including Archrock, their transferees and persons who acquired such units with the prior approval of our board of directors, cannot vote on any matter. Our Partnership Agreement also contains provisions limiting the ability of unitholders to call meetings or to acquire information about our operations, as well as other provisions.

Affiliates of our General Partner may sell common units in the public or private markets, which could have an adverse impact on the trading price of the common units.

At December 31, 2017, Archrock and its affiliates held 29,064,637 common units. The sale of these common units in the public or private markets could have an adverse impact on the price of the common units or on any trading market that may develop.

Our General Partner has a limited call right that may require unitholders to sell their units at an undesirable time or price.

If at any time our General Partner and its affiliates own more than 80% of the common units, our General Partner will have the right, but not the obligation, which it may assign to any of its affiliates or to us, to acquire all, but not less than all, of the common units held by unaffiliated persons at a price not less than their then-current market price. As a result, unitholders may be required to sell their common units at an undesirable time or price and may not receive any return on their investment. Unitholders may also incur a tax liability upon a sale of their units. At December 31, 2017, our General Partner and its affiliates owned 41% of our aggregate outstanding common units.

Unitholder liability may not be limited if a court finds that unitholder action constitutes control of our business.

A general partner of a partnership generally has unlimited liability for the obligations of the partnership, except for those contractual obligations of the partnership that are expressly made without recourse to the general partner. Our partnership is organized under Delaware law and we conduct business in a number of other states. The limitations on the liability of holders of limited partner interests for the obligations of a limited partnership have not been clearly established in some of the other states in which we do business. Unitholders could be liable for any and all of our obligations as if they were a general partner if:

• a court or government agency determined that we were conducting business in a state but had not complied with that particular state’s partnership statute; or

• a unitholder’s right to act with other unitholders to remove or replace our General Partner, to approve some amendments to our Partnership Agreement or to take other actions under our Partnership Agreement constitutes “control” of our business.

Unitholders may have liability to repay distributions that were wrongfully distributed to them.

Under certain circumstances, unitholders may have to repay amounts wrongfully returned or distributed to them. Under Section 17-607 of the Delaware Revised Uniform Limited Partnership Act, we may not make a distribution to our unitholders if the distribution would cause our liabilities to exceed the fair value of our assets. Delaware law provides that for a period of three years from the date of the impermissible distribution, limited partners who received the distribution and who knew at the time of the distribution that it violated Delaware law will be liable to the limited partnership for the distribution amount. Substituted limited partners are liable for the obligations of the assignor to make contributions to the partnership that are known to the substituted limited partner at the time it became a limited partner and for unknown obligations if the liabilities could be determined from our Partnership Agreement. Liabilities to partners on account of their partnership interest and liabilities that are non-recourse to the partnership are not counted for purposes of determining whether a distribution is permitted.

The market price of our common units may be influenced by many factors.

Our common units are traded publicly on the NASDAQ Global Select Market under the symbol “APLP.”

The market price of our common units may be influenced by many factors, some of which are beyond our control, including:

• our quarterly distributions;

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• our quarterly or annual earnings or those of other companies or partnerships in our industry;

• changes in commodity prices, including oil, natural gas and natural gas liquids;

• changes in demand for natural gas in the U.S.;

• loss of a large customer;

• changes in interest rates;

• announcements by us or our competitors of significant contracts or acquisitions;

• changes in accounting standards, policies, guidance, interpretations or principles;

• tax legislation;

• general economic conditions;

• the failure of securities analysts to cover our common units or changes in financial estimates by analysts;

• future sales of our common units; and

• the other factors described in these Risk Factors.

Increases in interest rates could adversely impact our unit price, our ability to issue additional equity or incur debt to make acquisitions or for other purposes, and our ability to make distributions to our unitholders.

As with other yield-oriented securities, our unit price is impacted by the level of our cash distributions and implied distribution yield. The distribution yield is often used by investors to compare and rank related yield-oriented securities for investment decision-making purposes. Therefore, changes in interest rates, either positive or negative, may affect the yield requirements of investors who invest in our units, and a rising interest rate environment could have an adverse impact on our unit price, our ability to issue additional equity or incur debt to make acquisitions or for other purposes and our ability to make distributions to our unitholders.

Tax Risks to Common Unitholders

The recently passed comprehensive tax reform bill could adversely affect our business and financial condition.

On December 22, 2017, President Trump signed into law the Tax Cuts and Jobs Act that significantly reforms the Code. The TCJA, among other things, contains significant changes to the determination of taxable income for partnerships, including a partial limitation on the deductibility of business interest expense, immediate deductions for certain new investments instead of deductions for depreciation expense over time, the cessation of like-kind exchange treatment for exchanges of tangible personal property, the cessation of technical terminations and the modification or repeal of many business deductions and credits. We continue to examine the impact of this tax reform legislation, as its overall impact is uncertain.

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Our tax treatment depends on our status as a partnership for U.S. federal income tax purposes. We could lose our status as a partnership for a number of reasons, including not having enough “qualifying income.” If the IRS were to treat us as a corporation for U.S. federal income tax purposes, our cash available for distribution would be substantially reduced.

The anticipated after-tax economic benefit of an investment in our common units depends largely on our being treated as a partnership for U.S. federal income tax purposes. The IRS has made no determination on our partnership status.

Despite the fact that we are a limited partnership under Delaware law, a publicly-traded partnership such as us will be treated as a corporation for U.S. federal income tax purposes unless 90% or more of its gross income from its business activities is “qualifying income” under Section 7704(d) of the Code. “Qualifying income” includes income and gains derived from the exploration, development, production, processing, transportation, storage and marketing of natural gas and natural gas products or other passive types of income such as interest and dividends. Although we do not believe, based upon our current operations, that we are treated as a corporation, we could be treated as a corporation for U.S. federal income tax purposes or otherwise subject to taxation as an entity if our gross income is not properly classified as qualifying income, there is a change in our business or there is a change in current law.

If we were treated as a corporation for U.S. federal income tax purposes, we would pay U.S. federal income tax on our taxable income at the corporate tax rate and would likely pay state income tax at varying rates. Further, distributions to unitholders would generally be taxed again as corporate distributions, and no income, gains, losses or deductions would flow through to our unitholders. Therefore, treatment of us as a corporation would result in a material reduction in the distributions and after-tax return to the unitholders, which would cause a substantial reduction in the value of our common units. Because a tax would be imposed upon us as a corporation, our cash available for distribution would be substantially reduced. Our Partnership Agreement provides that if a law is enacted or existing law is modified or interpreted in a manner that subjects us to taxation as a corporation or otherwise subjects us to additional entity-level taxation, the minimum quarterly distribution amount and the target distribution amounts may be adjusted to reflect the impact of that law on us.

The tax treatment of publicly-traded partnerships or an investment in our common units could be subject to potential legislative, judicial or administrative changes or differing interpretations, possibly applied on a retroactive basis.

The present U.S. federal income tax treatment of publicly-traded partnerships, including us, or an investment in our common units may be modified by administrative, legislative or judicial changes or differing interpretations at any time. From time to time, members of Congress propose and consider substantive changes to the existing U.S. federal income tax laws that affect publicly-traded partnerships. Although there is no current legislative proposal, and one was not included in the TCJA, a prior legislative proposal would have eliminated the qualifying income exception to the treatment of all publicly-traded partnerships as corporations upon which we rely for our treatment as a partnership for U.S. federal income tax purposes.

We have requested and obtained favorable private letter rulings from the IRS with respect to the characterization of certain of our income as “qualifying income.” In addition, on January 24, 2017, final regulations regarding which activities give rise to qualifying income within the meaning of Section 7704 of the Code (the “Final Regulations”) were published in the Federal Register. The Final Regulations were effective as of January 19, 2017, and apply to taxable years beginning on or after January 19, 2017. We do not believe the Final Regulations affect our ability to be treated as a partnership for U.S. federal income tax purposes. However, any modification to the U.S. federal income tax laws may be applied retroactively and could make it more difficult or impossible for us to meet the exception for certain publicly-traded partnerships to be treated as partnerships for U.S. federal income tax purposes.

We are unable to predict whether any of these changes or other proposals will ultimately be enacted. Any such legislative changes could cause us to be treated as a corporation for U.S. federal income tax purposes or otherwise subject us to taxation as an entity if our gross income is not properly classified as qualifying income and could negatively impact the value of an investment in our common units. If we were treated as a corporation for U.S. federal income tax purposes, we would pay federal income tax on our taxable income at the corporate rate. Further, distributions to unitholders would generally be taxed as corporate distributions and no income, gains, losses or deductions would flow through to our unitholders. Therefore, treatment of us as a corporation would result in a material reduction in the distributions and after-tax return to the unitholders, which would cause a substantial reduction in the value of our common units. Our Partnership Agreement provides that if a law is enacted or existing law is modified or interpreted in a manner that subjects us to taxation as a corporation or otherwise subjects us to additional entity-level taxation, the minimum quarterly distribution amount and the target distribution amounts may be adjusted to reflect the impact of that law on us.

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If we were subjected to additional entity-level taxation by individual states, it would reduce our cash available for distribution.

Changes in current state law may subject us to additional entity-level taxation by individual states. Several states are evaluating ways to subject partnerships to entity-level taxation through the imposition of state income, franchise and other forms of taxation. Currently we are subject to income and franchise taxes in several states. Imposition of such taxes on us reduces the cash available for distribution to our unitholders and may adversely affect the value of our common units. Our Partnership Agreement provides that if a law is enacted or existing law is modified or interpreted in a manner that subjects us to additional amounts of entity-level taxation, the minimum quarterly distribution amount and the target distribution amounts may be adjusted to reflect the impact of that law on us.

If the IRS contests the U.S. federal income tax positions we take, the market for our common units may be adversely affected and the costs of any IRS contest will reduce our cash available for distribution. Recently enacted legislation alters the procedures for assessing and collecting taxes due for taxable years beginning after December 31, 2017, in a manner that could substantially reduce cash available for distribution.

The IRS has made no determination with respect to our treatment as a partnership for U.S. federal income tax purposes. The IRS may adopt positions that differ from the positions we take. It may be necessary to resort to administrative or court proceedings to sustain some or all of the positions we take, and a court may not agree with some or all of those positions. Any contest with the IRS may materially and adversely impact the market for our common units and the price at which they trade. In addition, the costs of any contest with the IRS will result in a reduction in cash available for distribution and thus will be borne indirectly by our unitholders and our General Partner.

Recently enacted legislation applicable to us for taxable years beginning after December 31, 2017 alters the procedures for auditing large partnerships and also alters the procedures for assessing and collecting taxes due (including applicable penalties and interest) as a result of an audit. Unless we are eligible to (and choose to) elect to issue revised Schedules K-1 to our partners with respect to an audited and adjusted return, the IRS may assess and collect taxes (including any applicable penalties and interest) directly from us in the year in which the audit is completed under the new rules. Although our General Partner may elect to have our unitholders take such audit adjustments into account in accordance with their interests in us during the tax year under audit, there can be no assurance that such election will be practical, permissible or effective in all circumstances. As a result, our current unitholders may bear some or all of the tax liability resulting from such audit adjustment, even if such unitholders did not own units in us during the tax year under audit. If, as a result of any such audit adjustment, we are required to make payments of taxes, penalties and interest, our cash available for distribution to our unitholders might be substantially reduced.

The treatment of the new qualified business income deduction to our unitholders could be subject to differing interpretations or potential legislative, judicial or administrative changes, possibly applied on a retroactive basis.

The TCJA generally provides for a 20% deduction against “qualified business income” for taxable years beginning after December 31, 2017. Qualified business income may include a unitholder’s share of our income, gain, deduction and loss as well as certain gains recognized from the disposition of interest in us that are otherwise treated as ordinary income. Uncertainties in the interpretation of this new provision or future modifications by administrative, legislative or judicial changes could impact the applicability of this provision to our unitholders. Unitholders should consult their tax advisors when applying this new provision to their U.S. federal income tax computations.

Unitholders are required to pay taxes on their share of our income even if they do not receive any cash distributions from us.

Because our unitholders are treated as partners to whom we will allocate taxable income, which could be different in amount than the cash we distribute, they will be required to pay any U.S. federal income taxes and, in some cases, state and local income taxes on their share of our taxable income even if they receive no cash distributions from us. Unitholders may not receive cash distributions from us equal to their share of our taxable income or even equal to the actual tax liability that results from that income.

In response to current market conditions, we may engage in transactions to de-lever the Partnership and manage our liquidity that may result in income and gain to our unitholders without a corresponding cash distribution. For example, if we sell assets and use the proceeds to repay existing debt or fund capital expenditures, unitholders may be allocated taxable income and gain resulting from the sale without receiving a cash distribution. Further, taking advantage of opportunities to reduce our existing debt, such as debt exchanges, debt repurchases or modifications of our existing debt could result in “cancellation of indebtedness income” (also referred to as “COD income”) being allocated to our unitholders as taxable income. Unitholders may be allocated COD income, and income tax liabilities arising therefrom may exceed cash distributions. The ultimate effect of any such allocations will depend on the unitholder's individual tax position with respect to its units. Unitholders are encouraged to consult their tax advisors with respect to the consequences to them of COD income.

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Tax gain or loss on the disposition of our common units could be more or less than expected.

Unitholders who sell common units recognize a gain or loss equal to the difference between the amount realized and their tax basis in those common units. Because distributions in excess of their allocable share of our net taxable income decrease their tax basis in their common units, the amount, if any, of such prior excess distributions with respect to the common units they sell will, in effect, become taxable income to them if they sell such common units at a price greater than their tax basis in those common units, even if the price received is less than the original cost. In addition, because the amount realized includes a unitholder’s share of our nonrecourse liabilities, unitholders who sell their units may incur a tax liability in excess of the amount of cash they receive from the sale.

A substantial portion of the amount realized from the sale of units, whether or not representing gain, may be taxed as ordinary income due to potential recapture items, including depreciation recapture. Thus, unitholders may recognize both ordinary income and capital loss from the sale of units if the amount realized on a sale of units is less than the unitholder’s adjusted basis in the units. Net capital loss may only offset capital gains and, in the case of individuals, up to $3,000 of ordinary income per year. In the taxable period in which a unitholder sells its units, the unitholder may recognize ordinary income from our allocations of income and gain prior to the sale and from recapture items that generally cannot be offset by any capital loss recognized upon the sale of units.

Tax-exempt entities and non-U.S. persons face unique tax issues from owning our common units that may result in adverse tax consequences to them.

Investment in common units by tax-exempt entities, such as employee benefit plans and IRAs, and non-U.S. persons raises issues unique to them. For example, virtually all of our income allocated to organizations that are exempt from U.S. federal income tax, including IRAs and other retirement plans, will be unrelated business taxable income and will be taxable to them. Distributions to non-U.S. persons will be reduced by withholding taxes imposed at the highest applicable effective tax rate, and non-U.S. persons will be required to file U.S. federal tax returns and pay tax on their share of our taxable income. Tax-exempt entities and non-U.S. persons should consult their tax advisors before investing in our common units.

We treat each purchaser of our common units as having the same tax benefits without regard to the actual common units purchased. The IRS may challenge this treatment, which could adversely affect the value of the common units.

Due to a number of factors, including our inability to match transferors and transferees of common units, we have adopted depreciation and amortization positions that may not conform to all aspects of existing Treasury Regulations. A successful IRS challenge to those positions could adversely affect the amount of tax benefits available to unitholders. It also could affect the timing of these tax benefits or the amount of gain from the sale of common units and could have a negative impact on the value of our common units or result in audit adjustments to unitholders’ tax returns.

We prorate our items of income, gain, loss and deduction between transferors and transferees of our units each month based upon the ownership of our units on the first day of each month, instead of on the basis of the date a particular unit is transferred. The IRS may challenge this treatment, and, if successful, we would be required to change the allocation of items of income, gain, loss and deduction among our unitholders.

We prorate our items of income, gain, loss and deduction between transferors and transferees of our units each month based upon the ownership of our units on the first day of each month (the “Allocation Date”), instead of on the basis of the date a particular unit is transferred. Similarly, we generally allocate certain deductions for depreciation of capital additions, gain or loss realized on a sale or other disposition of our assets and, in the discretion of our General Partner, any other extraordinary item of income, gain, loss or deduction based upon ownership on the Allocation Date. Treasury Regulations allow a similar monthly simplifying convention, but such regulations do not specifically authorize all aspects of our proration method. If the IRS were to challenge our proration method, we may be required to change the allocation of items of income, gain, loss and deduction among our unitholders.

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A unitholder whose units are the subject of a securities loan (e.g., a loan to a “short seller” to cover a short sale of units) may be considered to have disposed of those units. If so, he would no longer be treated for tax purposes as a partner with respect to those units during the period of the loan and may recognize gain or loss from the disposition.

Because there are no specific rules governing the U.S. federal income consequences of loaning a partnership interest, a unitholder whose units are the subject of a securities loan may be considered to have disposed of the loaned units. In that case, the unitholder may no longer be treated as a partner for tax purposes with respect to those units and may recognize gain or loss from such disposition during the period of the loan. Moreover, during the period of such a loan to the short seller, any of our income, gain, loss or deduction with respect to those units may not be reportable by the unitholder and any cash distributions received by the unitholder for those units could be fully taxable as ordinary income. Unitholders desiring to assure their status as partners and avoid the risk of gain recognition from a securities loan are urged to modify any applicable brokerage account agreements to prohibit their brokers from borrowing their units.

We have adopted certain valuation methodologies in determining unitholders’ allocations of income, gain, loss and deduction. The IRS may challenge these methods or the resulting allocations, and such a challenge could adversely affect the value of our common units.

In determining the items of income, gain, loss and deduction allocable to our unitholders, we must routinely determine the fair market value of our respective assets. Although we may from time to time consult with professional appraisers regarding valuation matters, we make many fair market value estimates using a methodology based on the market value of our common units as a means to measure the fair market value of our respective assets. The IRS may challenge these valuation methods and the resulting allocations of income, gain, loss and deduction.

A successful IRS challenge to these methods or allocations could adversely affect the amount, character and timing of taxable income or loss being allocated to our unitholders. It also could affect the amount of gain from our unitholders’ sale of common units and could have a negative impact on the value of the common units or result in audit adjustments to our unitholders’ tax returns without the benefit of additional deductions.

Unitholders may become subject to international, state and local taxes and return filing requirements in jurisdictions where we operate, own or acquire property.

In addition to U.S. federal income taxes, unitholders will likely be subject to other taxes, including international, state and local taxes, unincorporated business taxes and estate, inheritance or intangible taxes that are imposed by the various jurisdictions in which we do business or own or acquire property now or in the future, even if they do not live in any of those jurisdictions. Unitholders will likely be required to file international, state and local income tax returns and pay state and local income taxes in some or all of these jurisdictions. Further, they may be subject to penalties for failure to comply with those requirements. We conduct business and/or own assets in the states of Alabama, Arkansas, California, Colorado, Illinois, Indiana, Kansas, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Nebraska, New Mexico, New York, North Dakota, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Utah, West Virginia and Wyoming. Each of these states, other than Tennessee, Texas and Wyoming, currently imposes a personal income tax on individuals. A majority of these states impose an income tax on corporations and other entities that may be unitholders. As we make acquisitions or expand our business, we may conduct business or own assets in additional states that impose a personal income tax or that impose entity level taxes to which certain unitholders could be subject. It is each unitholder’s responsibility to file all applicable U.S. federal, international, state and local tax returns.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

Our executive office is located at 9807 Katy Freeway, Suite 100, Houston, Texas 77024, and our telephone number is 281-836-8000. We do not own or lease any material facilities or properties. Pursuant to our Omnibus Agreement, we reimburse Archrock for the cost of our pro rata portion of the properties we utilize in connection with our business.

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Item 3. Legal Proceedings

See Note 1517 (“Commitments and Contingencies”) to our Financial Statements for a discussion of litigation related to the Heavy Equipment Statutes, which is incorporated by reference into this Item 3.

In the ordinary course of business, we are also involved in various other pending or threatened legal actions. While management is unable to predict the ultimate outcome of these actions, it believes that any ultimate liability arising from any of these other actions will not have a material adverse effect on our consolidated financial position, results of operations or cash flows~~, including our ability to make cash distributions to our unitholders~~. However, because of the inherent uncertainty of litigation and arbitration proceedings, we cannot provide assurance that the resolution of any particular claim or proceeding to which we are a party will not have a material adverse effect on our consolidated financial position, results of operations or cash flows~~, including our ability to make cash distributions to our unitholders~~.

Item 4. Mine Safety Disclosures

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

~~Our~~As ~~common~~of ~~units trade on~~ the ~~NASDAQ~~Merger ~~Global~~in ~~Select~~April ~~Market under the symbol “APLP.” On February 15,~~ 2018, ~~the~~our ~~closing price of a~~ common ~~unit~~units ~~was~~are ~~$13.03.~~no Atlonger ~~the~~publicly ~~close~~traded ~~of business on February 15, 2018 we had approximately 19 registered common unitholders. The actual number of common unitholders is greater than this number of registered holders~~ and ~~includes~~all common ~~unitholders~~units ~~who~~outstanding are ~~beneficial owners but whose common units are~~ held ~~in street name~~ by ~~banks, brokers and other nominees~~Archrock.

The following table sets forth the range of high and low sale prices for our common units and cash distributions declared per common unit for the periods indicated.

	Price Range
	High		Low
Year Ended December 31, 2016
First Quarter	$	13.12	$	5.36
Second Quarter	16.00		9.61
Third Quarter	15.64		12.79
Fourth Quarter	17.47		13.43
Year Ended December 31, 2017
First Quarter	$	18.55	$	15.66
Second Quarter	17.14		12.56
Third Quarter	15.64		12.69
Fourth Quarter	14.60		10.58

For disclosures regarding securities authorized for issuance under equity compensation plans, see Part III, Item 12 (“Security Ownership of Certain Beneficial Owners and Management and Related Unitholder Matters”) of this 2017 Form 10-K.

Cash Distribution Policy

Within 45 days after the end of each quarter, we intend to distribute all of our available cash (as defined in our Partnership Agreement) to unitholders of record on the applicable record date. However, we do not have a legal obligation to and there is no guarantee that we will pay any specific distribution level on the units in any quarter. Even if our cash distribution policy is not modified or revoked, the amount of distributions paid under our policy and the decision to make any distribution is determined by our General Partner on a quarterly basis, taking into consideration the terms of our Partnership Agreement. We will be prohibited from making any distributions to unitholders if doing so would cause an event of default, or an event of default exists, under our senior secured credit facility.

We make distributions of available cash (as defined in our Partnership Agreement) from operating surplus in the following manner:

• first, 98% to all common unitholders, pro rata, and 2% to our General Partner, until each unit has received a distribution of $0.4025;

• second, 85% to all common unitholders, pro rata, and 15% to our General Partner, until each unit has received a distribution of $0.4375;

• third, 75% to all common unitholders, pro rata, and 25% to our General Partner, until each unit has received a total of $0.5250; and

• thereafter, 50% to all common unitholders, pro rata, and 50% to our General Partner.

In order to continue to pay cash distributions at the current rate, we will require available cash of approximately $20.5 million per quarter based on the number of common and general partner units outstanding on December 31, 2017.

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The following table summarizes our cash distributions declared and paid for 2017 and 2016:

Period Covering	Payment Date	Distribution perCommon Unit		Total Distribution(in thousands) (1)
1/1/2016 — 3/31/2016	May 13, 2016	$	0.2850	$	17,513
4/1/2016 — 6/30/2016	August 15, 2016	0.2850		17,513
7/1/2016 — 9/30/2016	November 14, 2016	0.2850		17,513
10/1/2016 — 12/31/2016	February 14, 2017	0.2850		19,107
1/1/2017 — 3/31/2017	May 15, 2017	0.2850		19,124
4/1/2017 — 6/30/2017	August 14, 2017	0.2850		20,459
7/1/2017 — 9/30/2017	November 14, 2017	0.2850		20,459
10/01/2017 — 12/31/2017	February 13, 2018	0.2850		20,455

——————

(1) Cash distributions for each quarter are declared and paid in the following calendar quarter.

Unregistered Sales of Equity Securities and Use of Proceeds

None.

Repurchase of Equity Securities

The following table summarizes our repurchases of equity securities during the three months ended December 31, 2017:

Period	Total Number of Units Repurchased(1)	Average Price Paid Per Unit		Total Number of Units Purchased as Part of Publicly-Announced Plans or Programs	Maximum Number of Units yet to be Purchased Under the Publicly-Announced Plans or Programs
October 1, 2017- October 31, 2017	—	$	—	N/A	N/A
November 1, 2017 - November 30, 2017	—	—		N/A	N/A
December 1, 2017 - December 31, 2017	3,837	11.68		N/A	N/A
Total	3,837	$	11.68	N/A	N/A

——————

(1) Represents units withheld to satisfy employees’ tax withholding obligations in connection with vesting of phantom units during the period.

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Item 6. Selected Financial Data

~~The~~We ~~table~~meet ~~below shows selected financial data for~~ the ~~Partnership~~conditions ~~for~~specified ~~each of the five years~~ in ~~the~~General ~~period~~Instruction ~~ended~~I(1)(a) ~~December 31,~~and ~~2017,~~(b) ~~which~~of ~~has~~Form ~~been~~10-K ~~derived~~and ~~from~~are ~~our~~thereby ~~audited~~permitted ~~Financial~~to ~~Statements.~~use ~~The~~the ~~following~~reduced ~~information~~disclosure ~~should~~format befor ~~read~~wholly-owned ~~together~~subsidiaries ~~with Management’s Discussion and Analysis~~ of ~~Financial~~reporting ~~Condition~~companies ~~and~~specified ~~Results~~therein. ofAccordingly, ~~Operations~~we ~~and~~have ~~the~~omitted ~~Financial~~from ~~Statements contained in~~ this ~~2017~~2018 Form 10-K ~~(in~~the ~~thousands,~~information ~~except~~called ~~per~~for ~~unit~~by ~~data)~~Item 6 “Selected Financial Data.”

	2017			2016 (1)(2)			2015 (1)			2014 (3)			2013 (1)
Statement of Operations Data:
Revenue	$	557,503		$	562,360		$	656,808		$	581,036		$	466,193
Gross margin(4)	328,148			352,949			398,316			342,998			264,148
Selling, general and administrative — affiliates	82,035			79,717			85,586			80,521			61,971
Depreciation and amortization	143,848			153,741			155,786			128,196			103,711
Long-lived asset impairment (5)	19,106			46,258			38,987			12,810			5,350
Restructuring charges (6)	—			7,309			—			702			—
Goodwill impairment (7)	—			—			127,757			—			—
Interest expense	84,291			77,863			74,581			57,811			37,068
Debt extinguishment costs (8)	291			—			—			—			—
Other income, net	(4,384		)	(2,594		)	(1,391		)	(74		)	(9,481		)
Provision for income taxes	3,382			1,412			1,035			1,313			1,506
Net income (loss)	$	(421	)	$	(10,757	)	$	(84,025	)	$	61,719		$	64,023
Income (loss) per common unit:
Basic and diluted	$	(0.01	)	$	(0.18	)	$	(1.71	)	$	0.89		$	1.18
Weighted average common units outstanding:
Basic	67,237			60,450			58,539			54,107			47,651
Diluted	67,237			60,450			58,539			54,109			47,667
Distributions declared and paid per common unit	$	1.1400		$	1.4275		$	2.2600		$	2.1650		$	2.0800
Other Financial Data:
Distributable cash flow (4)	$	137,139		$	175,696		$	190,690		$	177,628		$	152,976
Cash capital expenditures:
Growth (9)	149,048			38,445			177,373			258,636			126,635
Maintenance (10)	30,271			23,900			51,829			45,316			41,401
Balance Sheet Data:
Cash	$	8,078		$	217		$	472		$	295		$	182
Working capital (11)	30,925			39,216			55,928			60,256			46,802
Total assets	1,930,202			1,903,374			1,994,653			1,995,713			1,359,460
Long-term debt	1,361,053			1,342,724			1,410,382			1,286,564			749,352
Partners’ capital	514,740			522,173			547,996			683,341			591,755

Item 7. Management’s Narrative Analysis of Results of Operations

~~——————~~We meet the conditions specified in General Instruction I(1)(a) and (b) of Form 10-K and are thereby permitted to use the reduced disclosure format for wholly-owned subsidiaries of reporting companies specified therein. Accordingly, in lieu of the information called for by Part II Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” we have included “Management’s Narrative Analysis of Results of Operations” to explain the reasons for material changes in the amount of revenue and expense items in the most recent fiscal year presented and the fiscal year immediately preceding it.

~~(1)~~The Infollowing ~~November~~analysis ~~2016, April 2015, March 2013, and March 2012, we acquired from Archrock contract operations customer service agreements and a fleet~~ of ~~compressor~~our ~~units~~results ~~used to provide compression services under those agreements. An acquisition~~ of aoperations ~~business~~should ~~from~~be anread ~~entity under common control is generally accounted for~~ in ~~accordance~~conjunction with ~~GAAP~~our byFinancial ~~the~~Statements, ~~acquirer with retroactive application as if~~ the ~~acquisition~~notes ~~date~~thereto, ~~was~~and the ~~beginning~~other ~~of the earliest period included in the~~ financial ~~statements.~~information ~~Retroactive~~appearing ~~effect~~elsewhere ~~of these acquisitions was impracticable because such retroactive application would have required significant assumptions~~ in athis ~~prior~~2018 ~~period~~Form ~~that~~10-K. ~~cannot~~The befollowing ~~substantiated.~~discussion ~~Accordingly,~~includes ~~our~~forward-looking ~~financial~~ statements ~~include~~that ~~the~~involve ~~assets~~certain ~~acquired,~~risks ~~liabilities assumed, revenue~~ and ~~direct operating expenses associated with the acquisitions beginning on the date of each acquisition~~uncertainties. See ~~Note~~“Forward-Looking 3Statements” and Part I, Item 1A (“~~Business~~Risk ~~Acquisitions~~Factors”) toin ~~our~~this ~~Financial~~2018 ~~Statements~~Form ~~for further discussion on these acquisitions~~10-K.

~~(2)~~Financial InResults ~~March~~of ~~2016,~~Operations we— ~~completed~~Year ~~the~~Ended ~~March 2016 Acquisition~~December 31, ~~whereby~~2018 weCompared ~~completed an acquisition of contract operations customer service agreements with four customers and a fleet of 19 compressor units used~~ to ~~provide~~Year ~~compression~~Ended ~~services under those agreements comprising approximately 23~~December 31,~~000~~ horsepower. The results of operations attributable to the assets acquired in the March 2016 Acquisition have been included in our consolidated financial statements since the date of acquisition. See Note 3 (“Business Acquisitions”) to our Financial Statements for further discussion on these acquisitions.2017

(3) In April and August 2014, we completed acquisitions of natural gas compression assets, including compressor units, from MidCon, L.L.C., which on a combined basis included a fleet of 499 compressor units, comprising approximately 554,000 horsepower. The results of operations attributable to the assets acquired in these acquisitions have been included in our consolidated financial statements since the date of acquisition.



	Year Ended December 31,
	2018			2017
Revenue	$	612,358		$	557,503
Cost of sales (excluding depreciation and amortization)	244,576			229,355
Selling, general and administrative	70,030			82,035
Depreciation and amortization	136,757			143,848
Long-lived asset impairment	13,727			19,106
Interest expense, net	90,313			84,291
Debt extinguishment loss	—			291
Merger-related costs	2,718			1
Other income, net	(3,521		)	(4,385		)
Provision for income taxes	475			3,382
Net income (loss)	$	57,283		$	(421	)

~~(4)~~Revenue. ~~Gross~~The ~~margin~~increase ~~and~~in ~~distributable~~revenue ~~cash~~during ~~flow~~the ~~are~~year ~~non-GAAP~~ended ~~financial~~December 31, ~~measures.~~2018 ~~They~~compared ~~are~~to ~~defined~~the year ended December 31, ~~reconciled~~2017 was primarily due to ~~net~~a ~~income~~7% ~~(loss)~~increase in average operating horsepower and ~~discussed~~an ~~further~~increase in ~~“Non-GAAP~~contract ~~Financial~~operations ~~Measures”~~rates ~~below~~driven by an increase in customer demand. The increase in revenue was partially offset by the deferral of rebillable freight revenue as a result of the adoption of the Revenue Recognition Update.

44Cost of sales (excluding depreciation and amortization). The increase in cost of sales (excluding depreciation and amortization) during the year ended December 31, 2018 compared to the year ended December 31, 2017 was primarily driven by increases in maintenance expense and lube oil expense associated with the increase in average operating horsepower. These increases were partially offset by decreases in freight expense and expense associated with the mobilization of compressor units as a result of the capitalization and amortization of the portion of these costs that were incurred prior to the transfer of service in accordance with the adoption of the Revenue Recognition Update.

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~~(5)~~Depreciation ~~For~~and amortization. The decrease in depreciation and amortization expense during the year ended December 31, 2018 compared to the year ended December 31, 2017 was primarily due to a ~~discussion~~decrease in depreciation expense resulting from certain assets reaching the end of ~~long-lived~~their depreciable lives as well as the impact of asset impairments ~~see~~during ~~Note~~2017 12and ~~(“Long-Lived~~2018, ~~Asset~~offset ~~Impairment”)~~by toan ~~our~~increase ~~Financial~~in ~~Statements~~depreciation expense associated with fixed asset additions.

~~(6)~~Long-lived ~~For~~asset aimpairment. ~~discussion~~During the years ended December 31, 2018 and 2017, we reviewed the future deployment of ~~restructuring~~our ~~charges~~idle ~~see~~compression ~~Note~~assets 13for units that were not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. In addition, we evaluated for impairment idle units that had been culled from our fleet in prior years and were available for sale. See Note 14 (“~~Restructuring~~Long-Lived ~~Charges~~Asset Impairment”) to our Financial Statements for further details.

~~(7)~~The ~~For~~following atable ~~discussion~~presents the results of ~~goodwill~~our impairment ~~see~~review ~~Note 1~~ (~~“Organization~~dollars ~~and~~in ~~Summary of Significant Accounting Policies”~~thousands) ~~to our Financial Statements.~~:

(8) For a discussion of debt extinguishment costs see Note 7 (“Long-Term Debt”) to our Financial Statements.



	Year Ended December 31,
	2018		2017
Idle compressor units retired from the active fleet	170		230
Horsepower of idle compressor units retired from the active fleet	57,000		71,000
Impairment recorded on idle compressor units retired from the active fleet	$	13,727	$	17,959

(9) Growth capital expenditures are made to expand or to replace partially or fully depreciated assets or to expand the operating capacity or revenue of existing or new assets through construction, acquisition or modification. Substantially all of our growth capital expenditures are related to the acquisition cost of new compressor units that we add to our fleet. In addition, growth capital expenditures can also include the upgrading of major components on an existing compressor unit where the current configuration of the compressor unit is no longer in demand and the compressor unit is not likely to return to an operating status without the capital expenditures. These latter expenditures substantially modify the operating parameters of the compressor unit such that it can be used in applications that it previously was not suited for.

(10) Maintenance capital expenditures are made to maintain the existing operating capacity of our assets and related cash flows further extending the useful lives of the assets. Maintenance capital expenditures are related to the major overhauls of significant components of a compressor unit, such as the engine, compressor, and cooler, that return the components to a like new condition, but do not modify the applications for which the compressor unit was designed.

(11) Working capital is defined as current assets minus current liabilities.

Non-GAAP Financial Measures

Our management uses a variety of financial and operating metrics to analyze our performance. These metrics are significant factors in assessing our operating results and profitability and include the non-GAAP financial measures of gross margin and distributable cash flow.

Gross Margin

We define gross margin as total revenue less cost of sales (excluding depreciation and amortization). Gross margin is included as a supplemental disclosure because it is a primary measure used by our management to evaluate the results of revenue and cost of sales (excluding depreciation and amortization), which are key components of our operations. We believe gross margin is important because it focuses on the current operating performance of our operations and excludes the impact of the prior historical costs of the assets acquired or constructed that are utilized in those operations, the indirect costs associated with our SG&A activities, the impact of our financing methods and income taxes. Depreciation and amortization may not accurately reflect the costs required to maintain and replenish the operational usage of our assets and therefore may not portray the costs of current operating activity. As an indicator of our operating performance, gross margin should not be considered an alternative to, or more meaningful than, net income (loss) as determined in accordance with GAAP. Our gross margin may not be comparable to a similarly titled measure of another company because other entities may not calculate gross margin in the same manner.

Gross margin has certain material limitations associated with its use as compared to net income (loss). These limitations are primarily due to the exclusion of interest expense, depreciation and amortization, SG&A, impairment charges, restructuring charges, debt extinguishment costs, provision for (benefit from) income taxes and other (income) loss, net. Because we intend to finance a portion of our operations through borrowings, interest expense is a necessary element of our costs and our ability to generate revenue. Additionally, because we use capital assets, depreciation expense is a necessary element of our costs and our ability to generate revenue and SG&A expense is necessary to support our operations and required partnership activities. To compensate for these limitations, management uses this non-GAAP measure as a supplemental measure to other GAAP results to provide a more complete understanding of our performance.

The following table reconciles net loss to gross margin (in thousands):

	Year Ended December 31,
	2017			2016			2015			2014			2013
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)	$	61,719		$	64,023
Selling, general and administrative — affiliates	82,035			79,717			85,586			80,521			61,971
Depreciation and amortization	143,848			153,741			155,786			128,196			103,711
Long-lived asset impairment	19,106			46,258			38,987			12,810			5,350
Restructuring charges	—			7,309			—			702			—
Goodwill impairment	—			—			127,757			—			—
Interest expense	84,291			77,863			74,581			57,811			37,068
Debt extinguishment costs	291			—			—			—			—
Other income, net	(4,384		)	(2,594		)	(1,391		)	(74		)	(9,481		)
Provision for income taxes	3,382			1,412			1,035			1,313			1,506
Gross margin	$	328,148		$	352,949		$	398,316		$	342,998		$	264,148

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Distributable Cash Flow

We define distributable cash flow as net income (loss) (a) plus depreciation and amortization, impairment charges, restructuring charges, non-cash SG&A costs, interest expense, expensed acquisition costs and debt extinguishment costs, (b) less cash interest expense (excluding amortization of deferred financing fees, amortization of debt discount and non-cash transactions related to interest rate swaps) and maintenance capital expenditures and (c) excluding gains or losses on asset sales and other items. Distributable cash flow is a supplemental financial measure that management and, we believe, external users of our consolidated financial statements, such as industry analysts, investors, lenders and rating agencies, may use to assess our operating performance as compared to other publicly-traded partnerships without regard to historical cost basis. We also believe distributable cash flow is an important liquidity measure because it allows management and external users of our financial statements the ability to compute the ratio of distributable cash flow to the cash distributions declared to all unitholders, including incentive distribution rights, to determine the rate at which the distributable cash flow covers the distribution. Our distributable cash flow may not be comparable to a similarly titled measure of another company because other entities may not calculate distributable cash flow in the same manner.

Distributable cash flow is not a measure of financial performance under GAAP and should not be considered in isolation or as an alternative to net income (loss), cash flows from operating activities and other measures determined in accordance with GAAP. Items excluded from distributable cash flow are significant and necessary components to the operations of our business, and, therefore, distributable cash flow should only be used as a supplemental measure of our operating performance.

The following table reconciles our net income (loss) to distributable cash flow (in thousands, except ratios):

	Year Ended December 31,
	2017			2016			2015			2014			2013
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)	$	61,719		$	64,023
Depreciation and amortization	143,848			153,741			155,786			128,196			103,711
Long-lived asset impairment	19,106			46,258			38,987			12,810			5,350
Restructuring charges	—			7,309			—			702			—
Goodwill impairment	—			—			127,757			—			—
Cap on operating and SG&A costs provided by Archrock	—			—			—			13,850			25,180
Non-cash SG&A — affiliates	1,062			1,203			1,059			1,376			1,174
Interest expense	84,291			77,863			74,581			57,811			37,068
Expensed acquisition costs	—			523			302			2,471			821
Debt extinguishment costs	291			—			—			—			—
Less: Gain on sale of property, plant and equipment	(4,262		)	(3,585		)	(1,747		)	(2,466		)	(10,140		)
Less: Loss on non-cash consideration in March 2016 Acquisition	—			635			—			—			—
Less: Cash interest expense	(76,505		)	(73,594		)	(70,181		)	(53,525		)	(32,810		)
Less: Maintenance capital expenditures	(30,271		)	(23,900		)	(51,829		)	(45,316		)	(41,401		)
Distributable cash flow	$	137,139		$	175,696		$	190,690		$	177,628		$	152,976
Distributions declared to all unitholders for the period	$	80,497		$	71,647		$	154,349		$	136,829		$	112,705
Distributable cash flow coverage(1)	1.70x			2.45x			1.24x			1.30		x	1.36		x
Distributable cash flow coverage (without the benefit of the cost caps)(2)	1.70x			2.45x			1.24x			1.20		x	1.13		x

——————

(1) Defined as distributable cash flow for the period divided by distributions declared to all unitholders for the period.

(2) Defined as distributable cash flow excluding the benefit of the cost caps divided by distributions declared to all unitholders for the period, including incentive distribution rights. The benefit received by us from the caps on operating and SG&A costs provided by Archrock was $13.9 million and $25.2 million during the years ended December 31, 2014 and 2013, respectively. The caps on operating and SG&A costs provided by Archrock terminated on January 1, 2015.

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The following table reconciles our net cash provided by operating activities to distributable cash flow (in thousands):

	Year Ended December 31,
	2017			2016			2015			2014			2013
Net cash provided by operating activities	$	179,333		$	213,029		$	241,166		$	185,764		$	158,286
(Provision for) benefit from doubtful accounts	(4,104		)	(2,672		)	(2,255		)	(1,060		)	25
Restructuring charges	—			7,309			—			702			—
Cap on operating and SG&A costs provided by Archrock	—			—			—			13,850			25,180
Expensed acquisition costs	—			523			302			2,471			821
Deferred income tax (provision) benefit	(3,384		)	(1,444		)	160			(1,402		)	(356		)
Payments for settlement of interest rate swaps that include financing elements	(1,785		)	(3,058		)	(3,728		)	(3,793		)	(2,207		)
Maintenance capital expenditures	(30,271		)	(23,900		)	(51,829		)	(45,316		)	(41,401		)
Changes in assets and liabilities	(2,650		)	(14,091		)	6,874			26,412			12,628
Distributable cash flow	$	137,139		$	175,696		$	190,690		$	177,628		$	152,976

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our Financial Statements, the notes thereto, and the other financial information appearing elsewhere in this 2017 Form 10-K. The following discussion includes forward-looking statements that involve certain risks and uncertainties. See Part I (“Disclosure Regarding Forward-Looking Statements”) and Part I, Item 1A (“Risk Factors”) in this 2017 Form 10-K.

Overview

We are a Delaware limited partnership formed in June 2006 and are the U.S. market leader in the full-service natural gas compression business. Our contract operations services primarily include designing, sourcing, owning, installing, operating, servicing, repairing and maintaining equipment. We monitor our customers’ compression services requirements over time and, as necessary, modify the level of services and related equipment we employ to address changing operating conditions. We operate in one segment.

Recent Business Developments

Proposed Merger

See Note 1 (“Organization and Summary of Significant Accounting Policies”) and Note 17 (“Proposed Merger”) to our Financial Statements for details of the Proposed Merger.

Acquisitions

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In April 2015, we completed the April 2015 Contract Operations Acquisition whereby we acquired from Archrock contract operations customer service agreements with 60 customers and a fleet of 238 compressor units used to provide compression services under those agreements, comprising approximately 148,000 horsepower, or 3% (of then-available horsepower) of the combined contract operations business of Archrock and us. The acquired assets also included 179 compressor units, comprising approximately 66,000 horsepower, previously leased from Archrock to us. Total consideration for the transaction was $102.3 million, excluding transaction costs.

See Note 3 (“Business Acquisitions”) to our Financial Statements for further details of these acquisitions.

Trends and Outlook

Our business environment and corresponding operating results are affected by the level of energy industry spending for the exploration, development and production of oil and natural gas reserves in the U.S. Spending by oil and natural gas exploration and production companies is dependent upon these companies’ forecasts regarding the expected future supply, demand and pricing of oil and natural gas products as well as their estimates of risk-adjusted costs to find, develop and produce reserves. For example, oil and natural gas exploration and development activity and the number of well completions typically decline when there is a significant reduction in oil and natural gas prices or significant instability in energy markets. Our revenue, earnings and financial position are affected by, among other things, market conditions that impact demand and pricing for natural gas compression, our customers’ decisions between using our services or our competitors’ services, our customers’ decisions regarding whether to own and operate the equipment themselves and the timing and consummation of any acquisition of additional contract operations customer service agreements and equipment from third parties. Although our contract operations business is typically less impacted by commodity prices than certain other oil and natural gas service providers, changes in oil and natural gas exploration and production spending normally result in changes in demand for our services.

Natural gas consumption in the U.S. for the twelve months ended November 30, 2017 remained flat at 27,003 Bcf compared to 27,206 Bcf for the twelve months ended November 30, 2016. The EIA forecasts that total U.S. natural gas consumption will increase 5% in 2018 compared to 2017. The EIA estimates that the U.S. natural gas consumption level will be approximately 32 Tcf in 2040, or 18% of the projected worldwide total of approximately 177 Tcf.

Natural gas marketed production in the U.S. for the twelve months ended November 30, 2017 remained flat at 28,559 Bcf compared to 28,558 Bcf for the twelve months ended November 30, 2016. The EIA forecasts that total U.S. natural gas marketed production will increase 10% in 2018 compared to 2017. The EIA estimates that the U.S. natural gas production level will be approximately 38 Tcf in 2040, or 21% of the projected worldwide total of approximately 177 Tcf.

Historically, oil and natural gas prices and the level of drilling and exploration activity in the U.S. have been volatile. For example, the average price for natural gas (per MMBtu), based on daily Henry Hub spot prices, in 2017 was 19% higher than the average price in 2016, despite the spot price at December 29, 2017 being 1% lower than the spot price at December 30, 2016. The U.S. natural gas liquid composite price was 21% higher in November 2017 than in December 2016, and the average price, based on monthly pricing, in 2017 was 36% higher than the average price in 2016. The West Texas Intermediate crude oil spot price was 12% higher at December 29, 2017 than at December 30, 2016, and the average crude oil price, based on daily spot prices, in 2017 was 17% higher than the average price in 2016.

Lower natural gas and natural gas liquids prices during 2015 and the first half of 2016 caused many companies to reduce their natural gas drilling and production activities during 2015 and further reduce those activities during 2016 in select shale plays and in more mature and predominantly dry gas areas in the U.S., where we provide a significant amount of contract operations services. In addition, lower West Texas Intermediate crude oil prices during 2015 and 2016 resulted in a continued decrease in capital investment and in the number of new oil wells drilled by exploration and production companies in 2016 compared to 2015. Because we provide a significant amount of contract operations services related to the production of associated gas from oil wells and the use of gas lift to enhance production of oil from oil wells, our operations and our levels of operating horsepower were also impacted by crude oil drilling and production activity in 2015 and 2016.

As a result of the reduction in capital spending and drilling activity by U.S. producers in 2016, our business experienced a decline in revenue and operating horsepower and an increase in pricing pressure during 2016 compared to 2015.

Increased stability of oil and natural gas prices in the second half of 2016 and throughout 2017, compared to the declines experienced in 2015 and the first half of 2016, contributed to increased new orders for our compression services in 2017 compared to 2016. Average operating horsepower increased 2% in 2017 compared to the decline of 8% that we experienced in 2016. Although new orders for compression services were strong in 2017, given the operating horsepower declines and pricing pressure experienced in 2016, our 2017 revenue declined by 1% compared to 2016. Additionally, we invested more capital in new fleet units in 2017 than we did in 2016 to take advantage of improved market conditions during 2017.

According to Barclays 2018 Global E&P Spending Outlook, North America upstream spending is expected to increase by 21% in 2018. Due to this forecasted increase in customer spending in 2018, the significant increase in new orders for compression services in 2017 and our increased investment in new fleet units in 2017, we anticipate an increase in operating horsepower during 2018 compared to 2017 as well as increased revenue.

According to Drillinginfo, natural gas production is expected to increase approximately 18% through 2022, with further increases anticipated beyond then. We believe that significantly improved quantities, accessibility and price stability of natural gas in the U.S. will continue to drive higher levels of demand for liquid natural gas export, pipeline exports to Mexico, power generation and use as a petrochemical feedstock, which will in turn lead to a significant increase in demand for compression services.

Certain Key Challenges and Uncertainties

In addition to general market conditions in the oil and natural gas industry and competition in the natural gas compression industry, we believe the following represent some of the key challenges and uncertainties we will face in the future.

Capital Requirements and the Availability of External Sources of Capital. We anticipate investing more capital, particularly in new fleet units, in 2018 than we did in 2017 to take advantage of expected continued favorable market conditions during 2018. In order to fund a significant portion of these capital expenditures, we expect to incur borrowings under our Credit Facility and we may issue additional debt or equity securities, as appropriate, given market conditions. We have a substantial amount of debt that could limit our ability to fund these capital expenditures. Current conditions could limit our ability to access these markets to raise capital on affordable terms in 2018 and beyond. If we are not successful in raising capital within the time period required or at all, we may not be able to fund these capital expenditures, which could impair our ability to grow or maintain our business.

Cost Management. In January 2016, we undertook a cost reduction program to reduce our on-going operating expenses in light of then current and expected activity levels. This cost reduction program helped to mitigate the impact of the overall decline in our business during 2016 and 2017. However, maintaining cost reductions continues to be challenging, and there is no guarantee that the results of our previous cost reduction program will continue to result in a reduction in our operating expenses. An improvement in market conditions and resulting demand for our services could also cause us to experience increased operating expenses as we hire and incur additional expenses needed to support the market demand.

Labor. We have no employees. Archrock provides all operational staff, corporate staff and support services necessary to run our business and therefore we depend on Archrock’s ability to hire, train and retain qualified personnel. Although Archrock has been able to satisfy personnel needs in these positions thus far, retaining employees in our industry is a challenge. Our ability to grow and to continue to make quarterly distributions will depend in part on Archrock’s success in hiring, training and retaining employees that provide service to us.

Later-Cycle Market Participant. Compression service providers have traditionally been a later-cycle participant as energy markets improve. As such, we anticipate that any significant increase in the demand for our contract operations services will generally lag an increase in drilling activity. Increased stability of oil and natural gas prices in 2017 contributed to increased new orders for our compression services in 2017 compared to 2016. Despite these new orders, operating horsepower declines and pricing pressure experienced in 2016 resulted in a decline in our revenue in 2017 compared to 2016. In addition, we invested more capital in new fleet units and incurred increased costs associated with the start-up of compressor units, which further decreased our gross margin in 2017 compared to 2016. Natural gas production is expected to increase approximately 18% through 2022 and we believe this production growth will lead to a significant increase in demand for compression services, though significant improvement in revenue and gross margin is expected to lag the demand increase for compression services by several quarters or more.

Operating Highlights

The following table summarizes our total available horsepower, total operating horsepower, average operating horsepower and horsepower utilization (in thousands, except percentages):

	Year Ended December 31,
	2017		2016		2015
Total Available Horsepower (at period end)(1)(2)	3,290		3,290		3,320
Total Operating Horsepower (at period end)(1)(3)	2,956		2,874		3,030
Average Operating Horsepower	2,883		2,836		3,087
Horsepower Utilization:
Spot (at period end)	90	%	87	%	91	%
Average	88	%	86	%	93	%

——————

(1) Included compressor units comprising approximately 4,000, 1,000 and 17,000 horsepower leased from Archrock as of December 31, 2017, 2016 and 2015, respectively. Excluded compressor units comprising approximately 4,000, 6,000 and 12,000 horsepower leased to Archrock as of December 31, 2017, 2016 and 2015, respectively (see Note 4 (“Related Party Transactions”) to our Financial Statements).

(2) Defined as idle and operating horsepower. New compressor units completed by a third party manufacturer that have been delivered to us are included in the fleet.

(3) Defined as horsepower that is operating under contract and horsepower that is idle but under contract and generating revenue such as standby revenue.

Financial Results of Operations

Summary of Results

Net loss. We generated net loss of $0.4 million, $10.8 million and $84.0 million during the years ended December 31, 2017, 2016 and 2015, respectively.

The decrease in net loss during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to decreases in long-lived asset impairment, depreciation and amortization and restructuring charges, partially offset by the decrease in gross margin and an increase in interest expense.

The decrease in net loss during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to goodwill impairment recorded during the year ended December 31, 2015 and a decrease in SG&A expense, partially offset by a decrease in gross margin, an increase in long-lived asset impairments and an increase in restructuring charges.

Distributable cash flow. Our distributable cash flow was $137.1 million, $175.7 million and $190.7 million and our distributable cash flow coverage (distributable cash flow for the period divided by distributions declared to all unitholders for the period) was 1.70x, 2.45x and 1.24x during the years ended December 31, 2017, 2016 and 2015, respectively.

The decrease in distributable cash flow during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to the decrease in gross margin and increases in maintenance capital expenditures, cash interest expense and cash SG&A expense. The decrease in distributable cash flow coverage was driven by the decrease in distributable cash flow mentioned above and an increase in distributions declared to all unitholders during the year ended December 31, 2017 compared to the year ended December 31, 2016.

The decrease in distributable cash flow during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to a decrease in gross margin and an increase in cash interest expense, partially offset by a decrease in maintenance capital expenditures and cash SG&A expense. The increase in distributable cash flow coverage was primarily driven by a decrease in distributions declared to all unitholders during the year ended December 31, 2016 compared to the year ended December 31, 2015, partially offset by the decrease in distributable cash flow mentioned above.

For a reconciliation of distributable cash flow to net loss and net cash provided by operating activities, its most directly comparable financial measures calculated and presented in accordance with GAAP, see Item 6 (“Selected Financial Data — Non-GAAP Financial Measures”).

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Year Ended December 31, 2017 Compared to Year Ended December 31, 2016

The following table summarizes our revenue, gross margin, gross margin percentage, expenses and net loss (dollars in thousands):

	Year Ended December 31,
	2017			2016
Revenue	$	557,503		$	562,360
Gross margin(1)	328,148			352,949
Gross margin percentage(2)	59		%	63		%
Expenses:
Selling, general and administrative — affiliates	82,035			79,717
Depreciation and amortization	143,848			153,741
Long-lived asset impairment	19,106			46,258
Restructuring charges	—			7,309
Interest expense	84,291			77,863
Debt extinguishment costs	291			—
Other income, net	(4,384		)	(2,594		)
Provision for income taxes	3,382			1,412
Net loss	$	(421	)	$	(10,757	)

——————

(1) For a reconciliation of gross margin to net loss, its most directly comparable financial measure calculated and presented in accordance with GAAP, see Item 6 (“Selected Financial Data — Non-GAAP Financial Measures”).

(2) Defined as gross margin divided by revenue.

Revenue. The decrease in revenue during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to lower rates and a decline in average operating horsepower (excluding the horsepower acquired in the November 2016 Contract Operations Acquisition) resulting from a decrease in customer demand due to 2016 market conditions, partially offset by a $26.7 million increase in revenue due to the November 2016 Contract Operations Acquisition.

Gross margin. The decrease in gross margin during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to the decrease in revenue mentioned above and an increase in cost of sales associated with the November 2016 Contract Operations Acquisition, the start-up of compressor units and increases in lube oil expense and other operating costs. The increase in cost of sales was partially offset by the decrease in costs associated with the decline in average operating horsepower mentioned above. Gross margin percentage decreased during the year ended December 31, 2017 compared to the year ended December 31, 2016 primarily due to lower rates and the increase in cost of sales mentioned above.

Depreciation and amortization. The decrease in depreciation and amortization expense during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to a decrease in depreciation expense resulting from certain assets reaching the end of their depreciable lives as well as the impact of asset impairments during 2016 and 2017, partially offset by an increase in depreciation expense associated with fixed asset additions including depreciation on compressor units acquired in connection with the November 2016 Contract Operations Acquisition.

Long-lived asset impairment. During the years ended December 31, 2017 and 2016, we reviewed the future deployment of our idle compression assets for units that were not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. In addition, we evaluated for impairment idle units that had been culled from our fleet in prior years and were available for sale. See Note 12 (“Long-Lived Asset Impairment”) to our Financial Statements for further details.

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The following table presents the results of our impairment review for the years ended December 31, 2017 and 2016 (dollars in thousands:

	Year Ended December 31,
	2017		2016
Idle compressor units retired from the active fleet	230		430
Horsepower of idle compressor units retired from the active fleet	71,000		155,000
Impairment recorded on idle compressor units retired from the active fleet	$	17,959	$	42,460
Additional impairment recorded on available-for-sale compressor units previously culled	$	—	$	3,798

In addition to the impairment discussed above, $1.1 million of property, plant and equipment, including 5,000 horsepower of idle compressor units, was impaired during the year ended December 31, 2017 as the result of physical asset observations and other events that indicated the assets’ carrying values were not recoverable.

~~Restructuring charges. In the first quarter of 2016~~Selling, ~~Archrock~~general ~~determined~~and toadministrative. ~~undertake~~SG&A ais ~~cost~~primarily ~~reduction~~comprised ~~program~~of toan ~~reduce~~allocation ~~its~~of ~~on-going operating~~ expenses, including ~~workforce~~costs ~~reductions~~for ~~and~~personnel ~~closure~~support ofand ~~certain~~related ~~make~~expenditures, ~~ready~~from ~~shops. These actions were the result of~~ Archrock’s ~~review~~to ofus ~~its~~pursuant ~~business and efforts~~ to ~~efficiently~~the ~~manage~~terms ~~cost~~of ~~and~~the ~~maintain~~Omnibus ~~its~~Agreement ~~business~~(see inNote 5 ~~line~~(“Related ~~with~~Party ~~current~~Transactions”) ~~and~~to ~~expected~~our ~~activity~~Financial ~~levels~~Statements ~~and~~for ~~anticipated~~further ~~make~~details ~~ready~~on ~~demand in~~ the ~~U.S.~~Omnibus ~~market~~Agreement). The decrease in ~~restructuring~~SG&A ~~charges~~expense ~~during~~was ~~the~~primarily ~~year~~due ~~ended~~to ~~December 31,~~an ~~2017~~$8.0 ~~compared~~million todecrease ~~the~~in ~~year~~sales ~~ended~~and ~~December 31,~~use ~~2016~~tax ~~was~~primarily ~~due~~resulting tofrom the ~~completion~~settlement of ~~Archrock’s~~audits ~~cost reduction program~~ in the fourth quarter of ~~2016.~~2018 ~~See Note 13 (“Restructuring~~ and ~~Other~~$3.0 ~~Charges”)~~million todecrease ~~our~~in ~~Financial~~bad ~~Statements~~debt ~~for further discussion of these charges~~expense.

~~SG&A~~Interest ~~— affiliates~~expense. The increase in ~~SG&A~~interest expense, net during the year ended December 31, ~~2017~~2018 compared to the year ended December 31, ~~2016~~2017 was primarily due to aincreases ~~$1.4 million increase~~ in ~~bad~~the ~~debt~~average ~~expense.~~outstanding ~~SG&A~~balance ~~expense is primarily comprised~~ of anlong-term ~~allocation~~debt ~~of expenses, including costs for personnel support~~ and ~~related expenditures, from Archrock to us pursuant to~~ the ~~terms~~weighted ofaverage ~~the~~effective ~~Omnibus~~interest ~~Agreement.~~rate, ~~Costs~~partially ~~allocated~~offset ~~to us~~ by ~~Archrock~~$1.8 ~~remained~~million ~~relatively flat as a result~~ of aninterest ~~overall~~income ~~decrease~~earned inon ~~SG&A~~the ~~expense~~loan ~~incurred~~receivable bydue from Archrock, ~~partially offset by an increase~~ in ~~costs~~2018 ~~allocated~~and toa us$0.6 asmillion awrite-off ~~result~~ of andeferred ~~increase~~financing incosts ~~our~~associated ~~available~~with ~~horsepower as compared to~~ the ~~combined~~termination ~~available horsepower~~ of ~~Archrock and us which was largely driven by~~ the ~~November~~Former ~~2016~~Credit ~~Contract~~Facility ~~Operations~~in ~~Acquisition~~2017.

~~Interest~~Debt ~~expense~~extinguishment loss. ~~The~~We ~~increase~~recorded ina ~~interest~~debt ~~expense~~extinguishment ~~during~~loss ~~the~~of ~~year~~$0.3 ~~ended~~million ~~December 31,~~during ~~2017 compared to~~ the year ended December 31, ~~2016~~2017 ~~was~~as ~~primarily due to an increase in the weighted average effective interest rate and~~ a ~~$0.6~~result ~~million write-off~~ of ~~deferred financing costs associated with~~ the termination of the Former Credit Facility,. ~~partially~~See ~~offset~~Note 9 by(“Long-Term aDebt”) ~~decrease~~to inour ~~the~~Financial ~~average~~Statements ~~outstanding~~for ~~balance~~further ~~of long-term debt~~details.

~~Other~~Merger-related ~~income, net~~costs. ~~The~~We ~~increase~~incurred ~~in other income, net during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily driven by a~~ $02.7 million ~~increase~~of inMerger-related ~~the~~costs ~~gain~~consisting ~~on sale~~ of ~~property~~financial advisory, ~~plant~~legal and ~~equipment~~other asprofessional ~~well~~fees asduring the ~~incurrence in the~~ year ended December 31, ~~2016 of a $0~~2018.6 million loss on non-cash consideration associated with the March 2016 Acquisition and a combined $0.5 million of expensed acquisition cost associated with the March 2016 Acquisition and the November 2016 Contract Operations Acquisition.

~~Provision~~Other ~~for~~ income, ~~taxes~~net. The ~~increase~~decrease in ~~provision~~other ~~for~~ income, ~~taxes~~net during the year ended December 31, ~~2017~~2018 compared to the year ended December 31, ~~2016~~2017 was primarily due to ana ~~increase~~$1.1 inmillion andecrease ~~unrecognized~~in ~~tax~~the ~~benefit~~gain ~~resulting~~on ~~from~~sale ~~appellate~~of ~~court~~property, ~~decisions~~plant inand ~~2017,~~equipment partially offset by a ~~deferred~~$0.2 ~~state~~million ~~release~~increase ~~related~~in tointerest ~~the~~income ~~increase~~earned inrelated ~~our~~to ~~unrecognized~~a tax ~~benefit~~refund.

53Provision for income taxes. The decrease in provision for income taxes during the year ended December 31, 2018 compared to the year ended December 31, 2017 was primarily due to a lower unrecognized tax benefit recorded in 2018 compared to 2017 and benefits recorded in 2018 for the settlement of a tax audit and the release of an unrecognized tax benefit due to the expiration of a statute of limitations.

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Year Ended December 31, 2016 Compared to Year Ended December 31, 2015

The following table summarizes our revenue, gross margin, gross margin percentage, expenses and net loss (dollars in thousands):

	Year Ended December 31,
	2016			2015
Revenue	$	562,360		$	656,808
Gross margin(1)	352,949			398,316
Gross margin percentage(2)	63		%	61		%
Expenses:
Selling, general and administrative — affiliates	79,717			85,586
Depreciation and amortization	153,741			155,786
Long-lived asset impairment	46,258			38,987
Restructuring charges	7,309			—
Goodwill impairment	—			127,757
Interest expense	77,863			74,581
Other income, net	(2,594		)	(1,391		)
Provision for income taxes	1,412			1,035
Net loss	$	(10,757	)	$	(84,025	)

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(2) Defined as gross margin divided by revenue.

Revenue. The decrease in revenue for the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily driven by a decline in average operating horsepower and a decrease in rates, driven by a decrease in customer demand due to market conditions partially offset by an increase in revenue due to the inclusion of the results from the April 2015 Contract Operations Acquisition. Average operating horsepower decreased by 8% from approximately 3,087,000 during the year ended December 31, 2015 to approximately 2,836,000 during the year ended December 31, 2016.

Gross margin. The decrease in gross margin during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to the decrease in revenue discussed above, partially offset by a decrease in cost of sales driven by a decrease in repair and maintenance expense and a decrease in lube oil expense. These cost decreases were primarily driven by the decrease in average operating horsepower explained above, a decrease in commodity prices and efficiency gains in lube oil consumption, and cost management initiatives. Gross margin percentage increased primarily due to a decrease in costs associated with the start-up of units, cost management initiatives, and the decrease in lube oil expense explained above.

Depreciation and amortization. The decrease in depreciation and amortization expense during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to decreased depreciation from assets fully reserved or retired, and assets impaired during the year ended December 31, 2016 and the fourth quarter of 2015, partially offset by an increase in depreciation expense from fleet additions and an increase in amortization of customer related intangible assets acquired in connection with our March 2016 Acquisition.

Long-lived asset impairment. During the years ended December 31, 2016 and 2015, we reviewed the future deployment of our idle compression assets for units that were not of the type, configuration, condition, make or model that are cost efficient to maintain and operate. In addition, we evaluated for impairment idle units that had been culled from our fleet in prior years and were available for sale. See Note 12 (“Long-Lived Asset Impairment”) to our Financial Statements for further details.

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The following table presents the results of our impairment review for the years ended December 31, 2016 and 2015 (dollars in thousands):

	Year Ended December 31,
	2016		2015
Idle compressor units retired from the active fleet	430		330
Horsepower of idle compressor units retired from the active fleet	155,000		115,000
Impairment recorded on idle compressor units retired from the active fleet	$	42,460	$	35,332
Additional impairment recorded on available-for-sale compressor units previously culled	$	3,798	$	3,655

Restructuring charges. In the first quarter of 2016, Archrock determined to undertake a cost reduction program to reduce its on-going operating expenses, including workforce reductions and closure of certain make ready shops. These actions were the result of Archrock’s review of its business and efforts to efficiently manage cost and maintain its business in line with current and expected activity levels and anticipated make ready demand in the U.S. market. During the year ended December 31, 2016, we incurred $7.3 million of restructuring charges comprised of an allocation of expenses related to severance benefits and consulting fees associated with this cost reduction plan from Archrock to us pursuant to the terms of the Omnibus Agreement based on horsepower and other factors. See Note 13 (“Restructuring Charges”) to our Financial Statements for further discussion of these charges.

Goodwill impairment. In the fourth quarter of 2015, energy markets experienced an accelerated decline oil and natural gas prices which impacted our future cash flow forecasts, our market capitalization and the market capitalization of peer companies. We identified these conditions as a triggering event and performed a two-step goodwill impairment test as of December 31, 2015, which resulted in a full impairment of our goodwill of $127.8 million.

SG&A — affiliates. SG&A expenses are primarily comprised of an allocation of expenses, including costs for personnel support and related expenditures, from Archrock to us pursuant to the terms of the Omnibus Agreement. The decrease in SG&A expense was primarily due to decreased costs allocated to us by Archrock partially offset by a $0.4 million increase in bad debt expense. SG&A expenses represented 14% and 13% of revenue during the years ended December 31, 2016 and 2015, respectively

Interest expense. The increase in interest expense during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to an increase in the average balance of long-term debt as well as an increase in the average effective interest rates period over period.

Other income, net. The increase in other income, net, during the year ended December 31, 2016 as compared to the year ended December 31, 2015 was primarily driven by an increase in gain on sale of property, plant, and equipment of $1.8 million partially offset by a $0.6 million loss on non-cash consideration in the March 2016 Acquisition.

Provision for income taxes. The increase in our provision for income taxes during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily due to an increase in deferred state taxes caused by accelerated tax depreciation and our inability to fully benefit our taxable losses subject to state level taxation.

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Liquidity and Capital Resources

Overview

Our ability to fund operations, finance capital expenditures and make distributions to our unitholders depends on the levels of our operating cash flows and access to the capital and credit markets. Our primary sources of liquidity are cash flows generated from our operations and our borrowing availability under our Credit Facility.

Our cash flow is affected by numerous factors including prices and demand for our services, volatility in commodity prices and their effect on oil and natural gas exploration and production spending, conditions in the financial markets and other factors. Although new orders for compression services were strong in 2017, given the reduction in capital spending and drilling activity by our customers, our operating horsepower declines and the pricing pressure experienced in 2016 (see “Trends and Outlook” above), our cash flow from operations decreased in 2017 as compared to 2016. Despite this decrease, we believe that our operating cash flows and borrowings under the Credit Facility will be sufficient to meet our liquidity needs through at least December 31, 2018.

We intend to distribute all of our available cash to our unitholders. Available cash is reduced by cash reserves established by our General Partner to provide for the proper conduct of our business, including future capital expenditures. To the extent we are unable to finance growth externally and we are unwilling to establish cash reserves to fund future acquisitions, our cash distribution policy will significantly impair our ability to grow. Because we distribute all of our available cash, we may not grow as quickly as businesses that reinvest their available cash to expand ongoing operations. To the extent we issue additional units in connection with any acquisitions or growth capital expenditures, the payment of distributions on those additional units may increase the risk that we will be unable to maintain our per unit distribution level, which in turn may impact the available cash that we have to distribute for each unit. There are no limitations in our Partnership Agreement or in the terms of the Credit Facility on our ability to issue additional units, including units ranking senior to our common units.

We may from time to time seek to retire or purchase our outstanding debt through cash purchases and/or exchanges for equity securities, in open market purchases, privately negotiated transactions or otherwise. Such repurchases or exchanges, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors.

Capital Requirements

The natural gas compression business is capital intensive, requiring significant investment to maintain and upgrade existing operations. Our capital spending is dependent on the demand for our services and the availability of the type of compression equipment required for us to render those services to our customers. Our capital requirements have consisted primarily of, and we anticipate will continue to consist of, the following:

• growth capital expenditures, which are made to expand or to replace partially or fully depreciated assets or to expand the operating capacity or revenue generating capabilities of existing or new assets, whether through construction, acquisition or modification; and

• maintenance capital expenditures, which are made to maintain the existing operating capacity of our assets and related cash flows further extending the useful lives of the assets.

The majority of our growth capital expenditures are related to the acquisition cost of new compressor units that we add to our fleet. In addition, growth capital expenditures can also include the upgrading of major components on an existing compressor unit where the current configuration of the compressor unit is no longer in demand and the compressor is not likely to return to an operating status without the capital expenditures. These latter expenditures substantially modify the operating parameters of the compressor unit such that it can be used in applications for which it previously was not suited. Maintenance capital expenditures are related to major overhauls of significant components of a compressor unit, such as the engine, compressor and cooler, which return the components to a like-new condition, but do not modify the applications for which the compressor unit was designed.

Growth capital expenditures were $149.0 million, $38.4 million and $177.4 million for the years ended December 31, 2017, 2016 and 2015, respectively. The increase in growth capital expenditures during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to increased investment in new compression equipment as a result of increased customer demand as a result of improved market conditions. The decrease in growth capital expenditures during the year ended December 31, 2016 compared to the year ended December 31, 2015 was primarily driven by our customers’ reduced capital spending as a result of the significant decline in oil and natural gas prices. We anticipate investing more capital in new fleet units in 2018 than we did in 2017 to take advantage of expected improvement of market conditions in 2018.

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Maintenance capital expenditures were $30.3 million, $23.9 million and $51.8 million in the years ended December 31, 2017, 2016 and 2015, respectively. The increase in maintenance capital expenditures during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to increased start-up activity as a result of the increase in operating horsepower. The decrease in maintenance capital expenditures from December 31, 2016 compared to December 31, 2015 was primarily driven by our focus on disciplined capital spending in light of market conditions coupled with a decrease in average operating horsepower from 3.1 million during the year ended December 31, 2015 to 2.8 million during the year ended December 31, 2016. We intend to grow our business both organically and through third-party acquisitions. If we are successful in growing our business in the future, we would expect our maintenance capital expenditures to increase over the long term.

Without giving effect to any equipment we may acquire pursuant to any future acquisitions, we currently plan to spend approximately $215 million to $240 million in capital expenditures during 2018, including approximately $180 million to $200 million on growth capital expenditures and approximately $35 million to $40 million on maintenance capital expenditures. Archrock manages its and our respective fleets as one pool of compression equipment from which we can each readily fulfill our respective customers’ service needs. When we or Archrock are advised of a contract operations services opportunity, Archrock reviews both our and its fleet for an available and appropriate compressor unit. If the owner of the appropriate compressor unit is not the contracting entity, the unit is leased to or exchanged for other equipment of the contracting entity. The owner of the equipment being transferred is required to pay the costs associated with making the idle equipment suitable for the proposed customer. For equipment that is leased, the maintenance capital cost is a component of the lease rate that is paid under the lease. During 2017, we increased our purchases of new compressor units as compared to 2016. If we continue to acquire more compression equipment, we expect that more of our equipment will be available to satisfy our or Archrock’s customer requirements. As a result, we expect that our maintenance capital expenditures will continue to increase and that our lease expense will decrease.

In addition, our capital requirements include funding distributions to our unitholders. Given our objective of long-term growth through acquisitions, growth capital expenditure projects and other internal growth projects, we anticipate that over time we will continue to invest capital to grow and acquire assets. We expect to actively consider a variety of assets for potential acquisitions and growth projects. We expect to fund these future capital expenditures with borrowings under our Credit Facility and the issuance of additional debt and equity securities, as appropriate, given market conditions. The timing of future capital expenditures will be based on the economic environment, including the availability of debt and equity capital.

Financial Resources

Credit Facility

The following table presents the weighted average annual interest rate and average daily debt balance of our Credit Facility for the years ended December 31, 2017 and 2016:

	Year Ended December 31,
	2017			2016
Weighted average annual interest rate (1) (2)	4.8		%	3.7		%
Average daily debt balance (in millions) (2)	$	626.6		$	723.3

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(1) Excludes the effect of interest rate swaps.

(2) The amounts for the year ended December 31, 2017 pertain to the Credit Facility. The amounts for the year ended December 31, 2016 pertain to our Former Credit Facility.

Our Credit Facility matures on March 30, 2022, except that if any portion of our 6% senior notes due April 2021 are outstanding as of December 2, 2020, then the Credit Facility will instead mature on December 2, 2020. Portions of the Credit Facility up to $25.0 million and $50.0 million are available for the issuance of letters of credit and swing line loans, respectively. Subject to certain conditions, including approval by the lenders, we are able to increase the aggregate commitments under the Credit Facility by up to an additional $250.0 million. The Credit Facility borrowing base consists of eligible accounts receivable, inventory and compressor units.

Concurrent with entering into the Credit Facility in March 2017, we terminated our Former Credit Facility. All commitments under the Former Credit Facility have been terminated.

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We must maintain the following consolidated financial ratios, as defined in the Credit Facility agreement:

EBITDA to Interest Expense	2.5 to 1.0
Senior Secured Debt to EBITDA	3.5 to 1.0
Total Debt to EBITDA
Through fiscal year 2017	5.95 to 1.0
Through fiscal year 2018	5.75 to 1.0
Through second quarter of 2019	5.50 to 1.0
Thereafter (1)	5.25 to 1.0

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(1) Subject to a temporary increase to 5.50 to 1.0 for any quarter during which an acquisition meeting certain thresholds is completed and for the following two quarters after the quarter in which the acquisition closes.

As a result of the Total Debt to EBITDA ratio limitation above, $128.4 million of the $425.7 million undrawn capacity under the Credit Facility was available for additional borrowings as of December 31, 2017.

The Credit Facility agreement also contains various additional covenants including, but not limited to, mandatory prepayments from the net cash proceeds of certain asset transfers, restrictions on the use of proceeds from borrowings and limitations on our ability to incur additional indebtedness, engage in transactions with affiliates, merge or consolidate, sell assets, make certain investments and acquisitions, make loans, grant liens, repurchase equity and pay distributions. In addition, if as of any date we have cash (other than proceeds from a debt or equity issuance received in the 30 days prior to such date reasonably expected to be used to fund an acquisition permitted under the Credit Facility agreement) in excess of $50.0 million, then such excess amount will be used to pay down outstanding borrowings of a corresponding amount under the Credit Facility. As of December 31, 2017, we were in compliance with all covenants under the Credit Facility.

The Notes

The Notes are guaranteed on a senior unsecured basis by all of our existing subsidiaries (other than APLP Finance Corp., which is a co-issuer of the Notes) and certain of our future subsidiaries. The Notes and the guarantees, respectively, are our and the guarantors’ general unsecured senior obligations, rank equally in right of payment with all of our and the guarantors’ other senior obligations, and are effectively subordinated to all of our and the guarantors’ existing and future secured debt to the extent of the value of the collateral securing such indebtedness. In addition, the Notes and guarantees are effectively subordinated to all existing and future indebtedness and other liabilities of any future non-guarantor subsidiaries. All of our subsidiaries are 100% owned, directly or indirectly, by us and guarantees by our subsidiaries are full and unconditional, subject to customary release provisions, and constitute joint and several obligations. We have no assets or operations independent of our subsidiaries and there are no significant restrictions upon our subsidiaries’ ability to distribute funds to us.

Capital Offering

In August 2017, we sold, pursuant to a public underwritten offering, 4,600,000 common units, including 600,000 common units pursuant to an over-allotment option. We received net proceeds of $60.3 million, after deducting underwriting discounts, commissions and offering expenses, which we used to repay borrowings outstanding under our Credit Facility. In connection with this sale and as permitted under our Partnership Agreement, we issued and sold 93,163 general partner units to our General Partner so it could maintain its approximate 2% general partner interest in us. We received net proceeds of $1.3 million from the General Partner contribution.

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Cash Flows

The following table summarizes our sources and uses of cash during the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017			2016
Net cash provided by (used in):
Operating activities	$	179,333		$	213,029
Investing activities	(148,309		)	(47,266		)
Financing activities	(23,163		)	(166,018		)
Net change in cash	$	7,861		$	(255	)

Operating Activities. The decrease in net cash provided by operating activities was primarily due to a decrease in gross margin and increases in cash paid for interest and SG&A expense, partially offset by a decrease in restructuring charges.

Investing Activities. The increase in net cash used in investing activities during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to a $117.0 million increase in capital expenditures, partially offset by a $13.8 million payment for the March 2016 Acquisition (as discussed in Note 3 (“Business Acquisitions”) to our Financial Statements) and a $2.2 million increase in proceeds from sale of property, plant and equipment.

Financing Activities. The decrease in net cash used in financing activities during the year ended December 31, 2017 compared to the year ended December 31, 2016 was primarily due to $14.8 million of net borrowings of long-term debt during the year ended December 31, 2017 compared to $71.0 million in net repayments of long-term debt during the year ended December 31, 2016, net proceeds of $60.3 million received from a public offering of our common units during the year ended December 31, 2017 and a $13.1 million decrease in distributions to unitholders. These changes were partially offset by a $13.1 million increase in debt issuance costs paid.

Distributions to Unitholders

Our Partnership Agreement requires us to distribute all of our “available cash” quarterly. Under our Partnership Agreement, available cash is defined generally to mean, for each fiscal quarter, (i) our cash on hand at the end of the quarter in excess of the amount of reserves our General Partner determines is necessary or appropriate to provide for the conduct of our business, to comply with applicable law, any of our debt instruments or other agreements or to provide for future distributions to our unitholders for any one or more of the upcoming four quarters, plus, (ii) if our General Partner so determines, all or a portion of our cash on hand on the date of determination of available cash for the quarter.

On January 18, 2018, our board of directors approved a cash distribution of $0.2850 per common unit, or $20.5 million. The distribution covered the period from October 1, 2017 through December 31, 2017. The record date for this distribution was February 8, 2018 and payment occurred on February 13, 2018. The amount of our cash distributions will be determined by our board of directors on a quarterly basis, taking into account a number of factors. There is no guarantee that we will continue to pay cash distributions to our unitholders at the current level, or at all.

Litigation and Claims

In 2011, the Texas Legislature enacted the Heavy Equipment Statutes, which made changes to the appraisal methodology for natural gas compressors for ad valorem tax purposes by expanding the definitions of “Heavy Equipment Dealer” and “Heavy Equipment.” Since the change in methodology became effective in 2012, we have recorded an aggregate benefit of $66.2 million as of December 31, 2017, of which $13.1 million has been agreed to by a number of appraisal review boards and county appraisal districts, and $53.1 million has been disputed and is currently in litigation. If we are unsuccessful in our litigation with the appraisal districts, or if legislation is enacted in Texas that repeals or alters the Heavy Equipment Statutes such that in the future we do not qualify as a Heavy Equipment Dealer or our compressors do not qualify as Heavy Equipment, then in the future we would likely be required to pay these ad valorem taxes under the old methodology, which would increase our quarterly cost of sales expense up to approximately the amount of our then-most recent quarterly benefit recorded. As a result, our future results of operations and cash flows, including our liquidity, our cash available for distribution and our ability to maintain our current level of distributions, could be negatively impacted. See Note 15 (“Commitments and Contingencies”) to our Financial Statements for further discussion of the Heavy Equipment Statutes.

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Contractual Obligations

The following table summarizes our cash contractual obligations as of December 31, 2017 (in thousands):

	2018		2019-2020		2021-2022		Thereafter		Total
Long-term debt(1)
Credit Facility	$	—	$	—	$	674,306	$	—	$	674,306
6% senior notes due April 2021(2)	—		—		350,000		—		350,000
6% senior notes due October 2022(3)	—		—		350,000		—		350,000
Total long-term debt	—		—		1,374,306		—		1,374,306
Interest on long-term debt(4)	77,985		155,971		86,760		—		320,716
Purchase commitments(5)	92,813		—		—		—		92,813
Total contractual obligations	$	170,798	$	155,971	$	1,461,066	$	—	$	1,787,835

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(1) For more information on our long-term debt, see Note 7 (“Long-Term Debt”) to our Financial Statements.

(2) Represents the full face value of the senior notes and are not reduced by the unamortized discount of $2.5 million and unamortized deferred financing costs of $3.3 million as of December 31, 2017.

(3) Represents the full face value of the senior notes and are not reduced by the unamortized discount of $3.4 million and unamortized deferred financing costs of $4.0 million as of December 31, 2017.

(4) Interest amounts calculated using interest rates in effect as of December 31, 2017, including the effect of our interest rate swaps.

(5) Includes commitments to purchase fleet assets.

At December 31, 2017, $6.9 million of unrecognized tax benefits have been recorded as liabilities in accordance with the accounting standard for income taxes related to uncertain tax positions, and we are uncertain as to if or when such amounts may be settled. Related to these unrecognized tax benefits, we have also recorded a liability for potential penalties and interest of $1.0 million.

Off-Balance Sheet Arrangements

For information on our obligations with respect to letters of credit see Note 7 (“Long-Term Debt”) to our Financial Statements.

Critical Accounting Estimates

This discussion and analysis of our financial condition and results of operations is based upon the Financial Statements, which have been prepared in accordance with GAAP. The preparation of the Financial Statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, expenses and related disclosure of contingent assets and liabilities. On an ongoing basis, we evaluate our estimates and accounting policies, including those related to bad debt, fixed assets, intangible assets, income taxes and contingencies and litigation. We base our estimates on historical experience and on other assumptions that we believe are reasonable under the circumstances. The results of this process form the basis of our judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions and these differences can be material to our financial condition, results of operations and liquidity. We describe our significant accounting policies more fully in Note 1 (“Organization and Summary of Significant Accounting Policies”) to our Financial Statements.

Allowances

Outstanding accounts receivable are reviewed regularly for non-payment indicators and allowances for doubtful accounts are recorded based upon management’s estimate of collectability at each balance sheet date. During the years ended December 31, 2017, 2016, and 2015, we recorded bad debt expense of $4.1 million, $2.7 million and $2.3 million, respectively. A five percent change in the allowance for doubtful accounts would have had an impact on income (loss) before income taxes of $0.1 million during the year ended December 31, 2017.

Depreciation

Property, plant and equipment are carried at cost. Depreciation is computed on the straight-line basis using estimated useful lives and salvage values. The assumptions and judgments we use in determining the estimated useful lives and salvage values of our property, plant and equipment reflect both historical experience and expectations regarding future use of our assets. The use of different estimates, assumptions and judgments in the establishment of property, plant and equipment accounting policies, especially those involving their useful lives, would likely result in significantly different net book values of our assets and results of operations.

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Business Combinations and Goodwill

Goodwill and intangible assets acquired in connection with business combinations represent the excess of consideration over the fair value of tangible net assets acquired. Certain assumptions and estimates are employed in determining the fair value of assets acquired and liabilities assumed.

We review the carrying value of our goodwill for potential impairment in the fourth quarter of every year, or whenever events or other circumstances indicate that we may not be able to recover the carrying amount. We first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as the basis for determining whether it is necessary to perform the two-step goodwill impairment test. We may elect to perform the two-step goodwill impairment test without completing a qualitative assessment.

If a two-step process goodwill impairment test is elected or required, the first step is to compare the implied fair value of our reporting unit with its carrying value (including the goodwill). If the implied fair value of the reporting unit is higher than the carrying value, no impairment was deemed to exist and no further testing is required. If, however, the implied fair value of the reporting unit is below the recorded carrying value, then a second step must be performed to determine the goodwill impairment required, if any. We calculate the implied fair value of the reporting unit goodwill by allocating the estimated fair value of the reporting unit to all of the assets and liabilities of the reporting unit as if the reporting unit had been acquired in a business combination. If the carrying value of the reporting unit’s goodwill exceeds the implied fair value of the goodwill, we recognize an impairment loss for that excess amount.

Determining the fair value of a reporting unit under the first step of the goodwill impairment test is judgmental in nature and involves the use of significant estimates and assumptions, which have a significant impact on the fair value determined. We determine the fair value of our reporting unit using both the expected present value of future cash flows and a market approach. Each approach is weighted 50% in determining our calculated fair value. The present value of future cash flows is estimated using our most recent forecast and the weighted average cost of capital. The market approach uses a market multiple on the earnings before interest expense, provision for income taxes and depreciation and amortization of comparable peer companies. Significant estimates for our reporting unit included in our impairment analysis are our cash flow forecasts, our estimate of the market’s weighted average cost of capital and market multiples.

Long-Lived Assets

We review long-lived assets, including property, plant and equipment and identifiable intangibles that are being amortized, for impairment whenever events or changes in circumstances, including the removal of compressor units from our active fleet, indicate that the carrying amount of an asset may not be recoverable. The determination that the carrying amount of an asset may not be recoverable requires us to make judgments regarding long-term forecasts of future revenue and costs related to the assets subject to review. These forecasts are uncertain as they require significant assumptions about future market conditions. Significant and unanticipated changes to these assumptions could require a provision for impairment in a future period. Given the nature of these evaluations and their application to specific assets and specific times, it is not possible to reasonably quantify the impact of changes in these assumptions. An impairment loss exists when estimated undiscounted cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. When necessary, an impairment loss is recognized and represents the excess of the asset’s carrying value as compared to its estimated fair value and is charged to the period in which the impairment occurred.

Income Taxes

Deferred income taxes arise from temporary differences between the financial statements and tax basis of assets and liabilities. Changes in tax laws and rates could affect recorded deferred tax liabilities in the future. Management is not aware of any such changes that would have a material effect on our financial position, results of operations or ability to make cash distributions to our unitholders. The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax laws and regulations in various state and local jurisdictions.

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The accounting standard for income taxes provides that a tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, on the basis of the technical merits. In addition, guidance is provided on measurement, derecognition, classification, interest and penalties, accounting in interim periods, disclosure and transition. We adjust these liabilities when our judgment changes as a result of the evaluation of new information not previously available. Because of the complexity of some of these uncertainties, the ultimate resolution may result in a payment that is materially different from our current estimate of the tax liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which new information is available.

Contingencies and Litigation

Self-Insurance

Archrock insures our property and operations and allocates certain insurance costs to us. Archrock is substantially self-insured for workers’ compensation, employer’s liability, property liability, auto liability, general liability and employee group health claims. Archrock regularly reviews estimates of reported and unreported claims and provides for losses based on claims filed and an estimate for significant claims incurred but not reported. Although we believe the insurance costs allocated to us are reasonable, it is reasonably possible that Archrock’s estimates of these liabilities will change over the near term as circumstances develop.

Litigation and Claims

In the ordinary course of business, we are involved in various pending or threatened legal actions. While we are unable to predict the ultimate outcome of these actions, the accounting standard for contingencies requires management to make judgments about future events that are inherently uncertain. We are required to record a loss during any period in which we believe a contingency is probable and can be reasonably estimated. In making determinations of likely outcomes of pending or threatened legal matters, we consider the evaluation of counsel knowledgeable about each matter.

The impact of an uncertain tax position taken or expected to be taken on an income tax return must be recognized in the financial statements at the largest amount that is more likely than not to be sustained upon examination by the relevant taxing authority. We regularly assess and, if required, establish accruals for income and non-income-based tax contingencies pursuant to the applicable accounting standards that could result from assessments of additional tax by taxing jurisdictions where we operate. Tax contingencies are subject to a significant amount of judgment and are reviewed and adjusted on a quarterly basis in light of changing facts and circumstances considering the outcome expected by management. As of December 31, 2017 and 2016, we recorded $9.5 million and $3.5 million (including penalties and interest), respectively, of accruals for tax contingencies. Of these amounts, $7.9 million and $2.0 million, respectively, were accrued for income taxes and $1.6 million and $1.5 million, respectively, were accrued for non-income based taxes. If our actual experience differs from the assumptions and estimates used for recording the liabilities, adjustments may be required and would be recorded in the period in which the difference becomes known.

Recent Accounting Developments

See Note 2 (“Recent Accounting Developments”) to our Financial Statements.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to market risk primarily associated with changes in the variable interest ~~rates~~rate ~~under~~of ~~our~~the ~~financing~~Credit ~~arrangements~~Facility. We use derivative instruments to ~~minimize~~manage ~~the~~our ~~risks~~exposure ~~and~~to ~~costs~~fluctuations ~~associated~~in ~~with~~this ~~financial~~variable ~~activities~~interest byrate ~~managing~~and ~~our~~thereby ~~exposure~~minimize tothe ~~interest~~risks ~~rate~~and ~~fluctuations~~costs onassociated awith ~~portion~~financing ~~of our debt obligations~~activities. We do not use derivative instruments for trading or other speculative purposes.

As of December 31, ~~2017~~2018, after taking into consideration interest rate swaps, we had $~~174~~339.35 million of outstanding indebtedness that was effectively subject to ~~floating~~variable interest rates. A 1% increase in the effective interest rate on our outstanding debt subject to ~~floating~~variable interest rates at December 31, ~~2017~~2018 would result in an annual increase in our interest expense of $13.74 million.

~~For~~See Note 12 (“Derivatives”) to our Financial Statements for further information regarding our use of interest rate ~~swap~~swaps ~~agreements~~in tomanaging ~~manage~~ our exposure to interest rate fluctuations ~~on a portion of our debt obligations, see Note 10 (“Derivatives”) to our Financial Statements~~.

Item 8. Financial Statements and Supplementary Data

The ~~financial statements and supplementary~~ information specified by this Item ~~are~~is presented in Part IV, Item 15 of this ~~2017~~2018 Form 10-K.

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Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Management’s Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this Annual Report on Form 10-K, our principal executive officer and principal financial officer evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) of the Exchange Act), which are designed to provide reasonable assurance that we are able to record, process, summarize and report the information required to be disclosed in our reports under the Exchange Act within the time periods specified in the rules and forms of the SEC. Based on the evaluation, as of December 31, ~~2017~~2018, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were effective to provide reasonable assurance that the information required to be disclosed in reports that we file or submit under the Exchange Act is accumulated and communicated to management, and made known to our principal executive officer and principal financial officer, on a timely basis to ensure that it is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

Management’s Annual Report on Internal Control Over Financial Reporting

As required by Exchange Act Rules 13a-15(c) and 15d-15(c), our management, including the Chief Executive Officer and Chief Financial Officer, is responsible for establishing and maintaining adequate internal control over financial reporting. Management conducted an evaluation of the effectiveness of internal control over financial reporting based on the Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness as to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. Based on the results of management’s evaluation described above, management concluded that our internal control over financial reporting was effective as of December 31, ~~2017~~2018.

The effectiveness of internal control over financial reporting as of December 31, ~~2017~~2018 was audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in its report found within this Annual Report on Form 10-K.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) during the last fiscal quarter that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Partners of Archrock Partners, L.P.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Archrock Partners, L.P. and subsidiaries (the “Partnership”) as of December 31, ~~2017~~2018, based on the criteria established in Internal Control -— Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, ~~2017~~2018, based on the criteria established in Internal Control -— Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements and financial statement schedule as of and for the year ended December 31, ~~2017~~2018, of the Partnership and our report dated February 2220, ~~2018~~2019, expressed an unqualified opinion on those financial statements and financial statement schedule and included an explanatory paragraph regarding the Partnership changed the manner in which accounts for revenue from contracts with customers due to the adoption of the new revenue standard on January 1, 2018. The Partnership adopted the new standard using the modified retrospective method.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed by, or under the supervision of, the company’s principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of ~~the~~its inherent limitations, of internal control over financial reporting, ~~including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud~~ may not beprevent ~~prevented~~ or ~~detected~~detect ~~on a timely basis~~misstatements. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

February 2220, ~~2018~~2019

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Item 9B. Other Information

None.

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PART III

We meet the conditions specified in General Instruction I(1)(a) and (b) of Form 10-K and are thereby permitted to use the reduced disclosure format for wholly-owned subsidiaries of reporting companies specified therein. Accordingly, we have omitted from this 2018 Form 10-K the information called for by the following sections:


•	Item 10 “Directors and Executive Officers of the Registrant”


•	Item 11 “Executive Compensation”


•	Item 12 “Security Ownership of Certain Beneficial Owners and Management”


•	Item 13 “Certain Relationships and Related Transactions”

Item 10. Directors, Executive Officers and Corporate Governance

~~Board~~The information called for by Item 10 is omitted pursuant to General Instruction I(2) to Form 10-K (Omission of ~~Directors~~Information by Certain Wholly-Owned Subsidiaries).

Because our General Partner is a limited partnership, its general partner, Archrock GP, conducts our business and operations. Archrock GP’s board of directors and officers, which we refer to as our board of directors and our officers, make decisions on our behalf. Our General Partner is not elected by our unitholders and is not subject to re-election on a regular basis in the future. Unitholders are not entitled to elect the directors of Archrock GP or directly or indirectly participate in our management or operation. As a result, we do not hold annual unitholder meetings. Our General Partner owes a fiduciary duty to our unitholders. Our General Partner is liable, as our sole general partner, for all of our debts (to the extent not paid from our assets), except for indebtedness or other obligations that are made expressly non-recourse to it. Our General Partner therefore may cause us to incur indebtedness or other obligations that are non-recourse to it.

NASDAQ does not require a listed limited partnership like us to have a majority of independent directors on our board of directors or to establish a compensation committee or a nominating committee. We have six directors, three of whom - James G. Crump, G. Stephen Finley and Edmund P. Segner, III - have been determined by the board to be “independent directors” within the meaning of applicable NASDAQ rules and Rule 10A-3 of the Exchange Act. In determining the independence of each director, we have adopted standards that incorporate the NASDAQ and Exchange Act standards.

Our board of directors has standing audit, compensation and conflicts committees. Each committee’s written charter is available on our website at www.archrock.com and without charge to any unitholder upon written request to Investor Relations, 9807 Katy Freeway, Suite 100, Houston, Texas 77024.

Our board of directors met six times during 2017 and took action by unanimous written consent on four occasions. During 2017, each director attended at least 75% of the aggregate number of meetings of the board of directors and any committee of the board of directors on which such director served.

Our directors hold office until the earlier of their death, resignation, removal or disqualification or until their successors have been elected and qualified. Officers serve at the discretion of the board of directors. There are no family relationships among any of our directors or executive officers, and there are no arrangements or understandings between any of the directors or executive officers and any other persons pursuant to which a director or officer was selected as such.

Audit Committee. The audit committee, which met five times during 2017, consists of Messrs. Crump, Finley (chair) and Segner. The board of directors has determined that each of Messrs. Crump, Finley and Segner is an “audit committee financial expert” as defined in Item 407(d)(5)(ii) of SEC Regulation S-K, and that each is “independent” within the meaning of the applicable NASDAQ and Exchange Act rules regulating audit committee independence. The audit committee assists our board of directors in its oversight of the integrity of our financial statements and our compliance with legal and regulatory requirements and corporate policies and controls. The audit committee has the sole authority to retain and terminate our independent registered public accounting firm, approve all auditing services and related fees and terms and pre-approve any non-audit services to be performed by our independent registered public accounting firm. The audit committee is also responsible for confirming the independence and objectivity of our independent registered public accounting firm. Our independent registered public accounting firm has unrestricted access to the audit committee.

Compensation Committee. The compensation committee, which met six times during 2017 and took action by unanimous written consent on one occasion, consists of Messrs. Crump, Finley and Segner (chair). The compensation committee discharges the board of directors’ responsibilities relating to compensation of our executives and independent directors, reviews and approves the manner in which Archrock allocates to us its compensation expense applicable to our executives and oversees the development and implementation of our compensation programs. The compensation committee also, in accordance with the SEC’s rules and regulations, produces the compensation discussion and analysis included in Item 11 (“Executive Compensation”) of this 2017 Form 10-K.

Conflicts Committee. The conflicts committee, which met six times during 2017, consists of Messrs. Crump, Finley (chair) and Segner. The purpose of the conflicts committee is to carry out the duties of the committee as set forth in our Partnership Agreement and the Omnibus Agreement, and any other duties delegated by our board of directors that may involve a conflict of interest. Any matters approved by the conflicts committee will be conclusively deemed to be fair and reasonable to us, approved by all of our partners and not a breach by our General Partner of any duties it may owe us or our unitholders.

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Section 16(a) Beneficial Ownership Reporting Compliance

Under Section 16(a) of the Exchange Act, directors, officers and beneficial owners of 10 percent or more of our common units (“Reporting Persons”) are required to report to the SEC on a timely basis the initiation of their status as a Reporting Person and any changes with respect to their beneficial ownership of our common units. Based solely on a review of Forms 3, 4 and 5 (and any amendments thereto) furnished to us and the representations made to us, we have concluded that Messrs. Crump, Finley and Segner were late in reporting the vesting of phantom units on two occasions due to an administrative error. No other Reporting Peron was delinquent with respect to their reporting obligations, as set forth in Section 16(a) of the Exchange Act.

Code of Ethics

Archrock GP has adopted a Code of Business Conduct and Ethics that applies to it and its subsidiaries and affiliates, including us, and to all of its and their respective employees, directors and officers, including its principal executive officer, principal financial officer and principal accounting officer. A copy of this code is available on our website at www.archrock.com or without charge upon written request to Investor Relations, 9807 Katy Freeway, Suite 100, Houston, Texas 77024.

Directors and Executive Officers

All of our executive officers allocate their time between managing our business and affairs and Archrock’s business and affairs. Archrock causes the executive officers to devote as much time to the management of our business and affairs as is necessary. A significant number of other employees of Archrock and its affiliates operate our business and provide us with general and administrative services.

Our current directors and executive officers are:

Name	Age	Title
D. Bradley Childers	53	President, Chief Executive Officer and Chairman of the Board
Raymond K. Guba	58	Interim Chief Financial Officer
Robert E. Rice	52	Senior Vice President, Chief Operating Officer and Director
Stephanie C. Hildebrandt	53	Senior Vice President, General Counsel and Director
Jason G. Ingersoll	47	Senior Vice President, Marketing and Sales
Donna A. Henderson	50	Vice President and Chief Accounting Officer
James G. Crump	77	Director
G. Stephen Finley	67	Director
Edmund P. Segner, III	64	Director

D. Bradley Childers Mr. Childers was elected President, Chief Executive Officer and Chairman of the Board of Archrock GP in December 2011, having served as interim Chief Executive Officer and interim Chairman of the Board since November 2011. Prior to that, Mr. Childers served as Senior Vice President and director of Archrock GP since June 2006 and May 2008, respectively. In December 2011, Mr. Childers also assumed the roles of President and Chief Executive Officer of Archrock, after serving in those roles on an interim basis since November 2011, and was elected a director of Archrock in April 2013. He was Senior Vice President of Archrock from August 2007 through November 2011. Prior to the Spin-off, he was also an officer of certain Exterran Corporation subsidiaries, including President, North America of Exterran Energy Solutions, LP. from March 2008 through November 2011. Prior to the merger of Hanover Compressor Company and Universal Compression Holdings, Inc. in August 2007, Mr. Childers joined Universal in 2002 and served in a number of management positions, including as Senior Vice President of Universal and President of the International Division of Universal Compression, Inc., Universal’s wholly-owned subsidiary. He held various positions with Occidental Petroleum Corporation (an international oil and gas exploration and production company) and its subsidiaries from 1994 to 2002, including as Vice President, Business Development at Occidental Oil and Gas Corporation. Mr. Childers is a member of the board of directors of Yellowstone Academy (a non-profit organization). Mr. Childers also serves as an officer of certain other Archrock subsidiaries. Mr. Childers holds a B.A. from Claremont McKenna College and a J.D. from the University of Southern California.

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Mr. Childers’ day to day leadership as our Chief Executive Officer and his role in forming the Partnership provide him with an intimate knowledge of our Partnership, including its strategies, operations and markets. His previous experience as President, North America of Exterran Energy Solutions, L.P. has provided him with intimate knowledge of our contract compression operations, as well as a unique understanding of market factors and operational challenges and opportunities. Mr. Childers’ business judgment, management experience and leadership skills are highly valuable in assessing our business strategies and accompanying risks. We believe this knowledge and experience make Mr. Childers well qualified to serve as a director of Archrock GP.

Raymond ("Randy") K. Guba. Mr. Guba has served since December 12, 2017 as Interim Chief Financial Officer of Archrock GP LLC and Archrock, Inc. pursuant to an interim services agreement among Archrock and Ranstad Professionals US, LLC (dba, Tatum). Mr. Guba served as the Chief Financial Officer and Senior Vice President of Global Power Equipment Group Inc. (a provider of equipment and support services for the global power generation industry) from November 2013 to September 2015. He was Executive Vice President and Chief Financial Officer of FTS International Services, LLC (a provider of hydraulic fracturing services) from September 2011 to March 2013. Previously, he served as Executive Vice President, Chief Financial and Administrative Officer of Integrated Electrical Services, Inc. ("IES", a provider of electrical and communications services) from April 2007 to April 2010 and as Principle Accounting Officer until January 2008. At IES, he led the financial restructure and integration of 27 independent divisions. Prior to that, Mr. Guba served as Chief Financial Officer and Vice President of Kraton Polymers LLC from October 2005 to October 2006. He served 19 years at General Electric ("GE") Company, culminating as Manager of Finance of GE Energy’s global installations and field services division and Chief Financial Officer of Auto Financial Services in Tokyo. Mr. Guba earned his BA in Economics and English from Rutgers University.

Robert E. Rice Mr. Rice was elected Senior Vice President and Director of Archrock GP in December 2011 and November 2015, respectively, and Chief Operating Officer in April 2016. He was also appointed Senior Vice President of Archrock in December 2011 and was appointed to the additional role of Chief Operating Officer in November 2015. Prior to the Spin-off, he was an officer of certain Exterran Corporation subsidiaries, including President, North America of Exterran Energy Solutions, L.P. from December 2011 through November 2015 and Regional Vice President for the U.S. Gulf Coast Region from August 2007 through December 2011. Prior to the merger of Hanover and Universal, Mr. Rice held the following positions at Hanover: Vice President, Gulf Coast Business Unit, from September 2003 to August 2007; Vice President, Health, Safety & Environmental, from October 2002 to September 2003; and Director, Corporate Development, January 2002 to October 2002. During his career, Mr. Rice has been based in Argentina and Australia and has developed detailed experience in analyzing, structuring and growing businesses in domestic and international energy markets. He served as a Flight Test Engineer with the United States Air Force. Mr. Rice serves as a director and as a member of the finance and audit committees of GATE, Inc. (a privately-held provider of engineering and commissioning services to the oil and gas industry) and serves as an officer of certain other Archrock subsidiaries. Mr. Rice earned a B.S. in electrical engineering from Louisiana Tech University.

Mr. Rice’s direct responsibility for our operations in his role as our Chief Operating Officer of Archrock and his previous role as President, North America of Exterran Energy Solutions, LP. has provided him with a first-hand working knowledge of our contract compression operations. Mr. Rice also possesses a thorough understanding of market factors and operational challenges and opportunities. He plays an integral role in assessing our business strategies and accompanying risks. We believe this knowledge and experience make Mr. Rice well qualified to serve as a director of Archrock GP.

Stephanie C. Hildebrandt. Ms. Hildebrandt joined Archrock GP LLC in August 2017 at which time she was also elected Senior Vice President, General Counsel and Secretary of Archrock, Inc. Ms. Hildebrandt was a partner of global business law firm Norton Rose Fulbright from February 2015 to July 2017. She previously worked as the Senior Vice President, General Counsel and Secretary of Enterprise Products Partners L.P. (“Enterprise,” a publicly traded pipeline and infrastructure company and consumer energy service provider) from May 2010 to December 2014 and held various other roles at Enterprise, including Vice President, Deputy General Counsel and Assistant Secretary from 2004 to May 2010. She served as an attorney for El Paso Corporation / GulfTerra Energy Partners from 2001 until its merger with Enterprise in 2004 and an attorney for Texaco, Inc. from 1989 to 2001. She served as a director of TRC Companies, Inc. (a provider of integrated services to the power, oil and gas, environmental and infrastructure markets) from December 2014 until its acquisition by private equity firm New Mountain Partners in June 2017, where she also served as chair of the compensation committee and member of the nominating and corporate governance committee. Ms. Hildebrandt has served as a director and a member of the audit committee of WildHorse Resource Development Corporation (an independent oil and natural gas resource company) since December 2017; as a director of Rice Midstream Management LLC, the general partner of Rice Midstream Partners LP (owner and operator of midstream natural gas assets in the Appalachian Basin) since March 2016 and as a member of the conflicts committee; as a member of the advisory council of the Kay Bailey Hutchison Center for Energy, Law & Business at the University of Texas since 2014; and as a member of the University of St. Thomas President’s Advisory Board since 2016. Ms. Hildebrandt also serves as an officer and director of certain other Archrock subsidiaries. Ms. Hildebrandt earned a BS in Foreign Service from Georgetown University and a JD from Tulane University Law School.

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Ms. Hildebrandt, having served in a leadership position with an energy provider and on the boards of two publicly-traded energy companies, brings a thorough understanding of legal and governance matters and the energy industry, and in particular, master limited partnerships. We believe this knowledge and experience make Ms. Hildebrandt well qualified to serve as a director of Archrock GP.

Jason G. Ingersoll. Mr. Ingersoll is Senior Vice President, Marketing and Sales, of Archrock GP and Archrock, positions he has held since February 2018, having served as Vice President, Marketing and Sales of Archrock GP and Archrock since April 2016 and November 2015, respectively. Prior to the Spin-off, he held positions of increasing responsibility with Exterran Energy Solutions, L.P., including Vice President, Sales from October 2013 to November 2015, Regional Vice President from January 2012 to October 2013, Business Unit Director from March 2009 to January 2012 and Sales Manager, Southern Rockies from July 2008 to March 2009. Prior to the merger of Hanover and Universal in 2007, he served Universal as Manager, Global Accounts from August 2006 to July 2008 and as Country Manager, China from July 2003 to August 2006. He serves as an officer of certain Archrock subsidiaries. Mr. Ingersoll earned a B.S. in mechanical engineering from Texas A&M University.

Donna A. Henderson Ms. Henderson is Vice President and Chief Accounting Officer of Archrock GP, positions she assumed in January 2016. Ms. Henderson has served as the Vice President, Accounting of the Company’s primary operating subsidiary since August 2015. Prior to joining Archrock, from April 2013 until June 2015, Ms. Henderson served as Vice President and Chief Accounting Officer of Southcross Energy Partners GP, LLC (a provider of natural gas gathering, processing, treating, compression and transportation services). From September 2011 to December 2012, Ms. Henderson was the Vice President and Chief Audit Executive of GenOn Energy, Inc. (a wholesale electric generator which merged into NRG Energy). Prior to that position, Ms. Henderson served as Assistant Controller of GenOn Energy, Inc. and its predecessor companies, RRI Energy, Inc. and Reliant Energy Inc., from July 2005 to September 2011, and held various other leadership roles within the accounting department of that organization since September 2000. From 1996 to 2000, Ms. Henderson held various accounting positions with Lyondell Chemical (a manufacturer of chemicals and polymers). Ms. Henderson began her career in Houston, Texas in 1989 with Deloitte & Touche LLP, where she worked until November 1993 when she joined KPMG LLP in Albuquerque, New Mexico, where she worked until 1995. Ms. Henderson holds a BBA in accounting from Eastern New Mexico University and is a member of the American Institute of Certified Public Accountants.

James G. Crump Mr. Crump was elected as a director of Archrock GP in October 2006. Mr. Crump began his career at Price Waterhouse in 1962 and became a partner in 1974. From 1977 until the merger of Price Waterhouse and Coopers Lybrand in 1998, Mr. Crump held numerous management and leadership roles. From 1998 until his retirement in 2001, Mr. Crump served as Global Energy and Mining Cluster Leader, as a member of the U.S. Management Committee and the Global Management Committee and as Houston Office Managing Partner. Mr. Crump served as chairman of the audit committee and a member of the conflicts committee of the board of directors of Copano Energy, L.L.C. (a natural gas gathering and processing company) from November 2004 until Copano was acquired by Kinder Morgan Energy Partners in May 2013. He is a director of the Lamar University Foundation and the Culinary Endowment and Scholarship, Inc. (both non-profit organizations). Mr. Crump holds a B.B.A. in accounting from Lamar University.

With a nearly 40-year career focused on providing independent public accounting services to the energy industry, Mr. Crump contributes a broad-based understanding of the oil and gas industry and of complex accounting and financial matters. We believe this knowledge and experience make Mr. Crump well qualified to serve as a director of Archrock GP.

G. Stephen Finley Mr. Finley was elected as a director of Archrock GP in November 2006. Mr. Finley served in various positions of increasing responsibility at Baker Hughes Incorporated (a provider of drilling, formation evaluation, completion and production products and services to the worldwide oil and gas industry) from 1982 until his retirement in 2006, including as Senior Vice President - Finance and Administration and Chief Financial Officer from April 1999 through April 2006. Mr. Finley currently serves as chairman of the audit committee and as a member of the compensation committee and the nominating and corporate governance committee of the board of directors of Newpark Resources, Inc. (a provider of integrated site, environmental and drilling fluid services to the oil and gas exploration and production industry). From March 2015 to February 2017, Mr. Finley served on the board of CPG GP LLC, the general partner of Columbia Pipeline Partners LP (an owner of natural gas pipelines, storage and related midstream assets); from April 2012 to December 2014, he served on the board of Microseismic, Inc. (a private oilfield services company providing real-time monitoring and mapping of hydraulic fracture operations in unconventional oil and gas plays); and from December 2006 to November 2011, he served on the board of Total Safety U.S., Inc. (a privately held company and global provider of integrated safety strategies and solutions for hazardous environments). Mr. Finley holds a B.S. from Indiana State University.

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Mr. Finley contributes extensive financial acumen and an understanding of the oil and gas services industry, including oilfield services companies, through his 24 years of service with Baker Hughes, including seven years as Chief Financial Officer, and also serves on the audit and compensation committees of the board of directors of another energy services company. We believe this knowledge and experience make Mr. Finley well qualified to serve as a director of Archrock GP.

Edmund P. Segner, III Mr. Segner was elected as a director of Archrock GP in May 2009. Mr. Segner is a Professor in the Practice of Engineering Management in the Department of Civil and Environmental Engineering at Rice University (Houston). In November 2008, Mr. Segner retired from EOG Resources, Inc. (EOG) (a publicly-traded independent oil and gas exploration and production company). Among the positions he held at EOG was President and Chief of Staff and Director from 1999 to 2007. From March 2003 through June 2007, he also served as EOG’s principal financial officer. He served as chairman of the audit committee and as a member of the finance committee of the board of Seahawk Drilling, Inc. (an owner and operator of offshore oil and gas platforms and a provider of shallow water contract drilling services to the oil and natural gas exploration industry) from August 2009 to October 2011. Mr. Segner served as a director and a member of the conflicts committee of Midcoast Holdings, LLC (a natural gas and natural gas liquids midstream company with operations primarily in Texas and Oklahoma) from February 2014 until it was acquired and taken private by Enbridge Energy Partners, L.P. in April 2017. He currently serves as chairman of the reserves and environment, health and safety committee and is a member of the audit and compensation committees of Bill Barrett Corporation (a company engaged in exploration and development of natural gas and oil reserves in the Rocky Mountain region of the U.S.). Mr. Segner also serves as lead director, audit committee chair and member of the nominating and governance committee of Laredo Petroleum, Inc. (a company focused on the exploration, development and acquisition of oil and natural gas properties in the Permian region of the U.S.). Mr. Segner is a member of the Society of Petroleum Engineers and currently serves on the board of trustees of the Nature Conservancy of Texas (a non-profit organization). Mr. Segner is a Certified Public Accountant and holds a B.S. in civil engineering from Rice University and an M.A. in economics from the University of Houston.

Mr. Segner brings technical experience and financial acumen to the board of directors. Having served in a senior management position for an oil and gas company, Mr. Segner also possesses a thorough understanding of the energy industry and operational challenges unique to this industry. In addition, as a former president of a public company and as a director of other public companies, Mr. Segner has valuable experience with other functions pertinent to our board, including compensation, financing matters and the evaluation of acquisition opportunities. We believe this knowledge and experience make Mr. Segner well qualified to serve as a director of Archrock GP.

Director Compensation

Retainers and Fees

Only the independent members of our board of directors receive compensation for their service as directors. Ms. Hildebrandt and Messrs. Childers and Rice, who also are our executive officers, and Messrs. Miller and Wayne, who separated from the Company in December and May, respectively, served on the board of directors during 2017 but received no compensation for such service. As reflected in the table below, in 2017, each non-employee director received an annual cash retainer, as well as a payment for each conflicts committee meeting attended. The chairmen of the audit committee, compensation committee and conflicts committee each received an additional retainer for their services. Through August 21, 2017, Mr. Crump served as chairman of the audit and conflicts committees and Mr. Finley served as chairman of the compensation committee. Effective August 21, Mr. Finley was appointed chairman of the audit and conflicts committees and Mr. Segner was appointed chairman of the compensation committee. All retainers are paid in arrears in equal quarterly installments.

		Applicability
Description of Remuneration	Annual Amount (except with respect to meeting fees ($))	Mr. Crump	Mr. Finley	Mr. Segner
Base Retainer	90,000	ü	ü	ü
Other Retainers:
Audit Committee Chairman	10,000		ü
Conflicts Committee Chairman	5,000		ü
Compensation Committee Chairman	5,000			ü
Attendance Fee (per Conflicts Committee attended)	1,500	ü	ü	ü

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In addition, each director is reimbursed for his reasonable out-of-pocket expenses in connection with attending meetings of the board of directors or committees. Each director will be fully indemnified by us for actions associated with serving as a director to the fullest extent permitted under Delaware law.

Equity-Based Compensation

As part of their annual compensation, non-employee directors are granted equity awards under the Partnership Plan. Following unitholder approval of the Archrock Partners, L.P. 2017 Long-Term Incentive Plan, on April 26, 2017, the Compensation Committee approved an annual grant of 5,525 shares of phantom units to each non-employee director valued at approximately $90,000 (based on the market closing price of our common units on April 26, 2017). The phantom units vested ratably on each of June 1, September 1 and December 1, 2017.

Total Compensation

The following table shows the total compensation paid to each non-employee director for service during 2017.

Name	Fees Earned in Cash ($)	Common Unit Awards ($)	Total ($)
James G. Crump	108,600	90,012	198,612
G. Stephen Finley	107,600	90,012	197,612
Edmund P. Segner, III	100,800	90,012	190,812

2018 Compensation

In consideration of the Proposed Merger, in February 2018 the Compensation Committee recommended and the Board approved the grant of up to $90,000 in cash to each non-employee director, in lieu of an annual grant of phantom units for 2018, with such cash grant to be paid in equal quarterly amounts in arrears with respect to each quarter beginning with the quarter commencing January 1, 2018, and assuming the Proposed Merger is consummated, the final quarterly payment to be prorated based on the number of days during such quarter up to the date the Proposed Merger is consummated.

Item 11. Executive Compensation

~~COMPENSATION~~The ~~DISCUSSION~~information ~~AND~~called ~~ANALYSIS~~for by Item 11 is omitted pursuant to General Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly-Owned Subsidiaries).

Overview

As is commonly the case for many publicly traded limited partnerships, we have no employees. Under the terms of our partnership agreement, we are ultimately managed by Archrock GP LLC, the general partner of Archrock General Partner, L.P., our general partner (which we may refer to as our general partner or Archrock GP LLC). We refer to Archrock GP LLC’s management and executive officers as “our management” and “our executive officers” and Archrock GP LLC’s board of directors and compensation committee as “our board of directors” and “our compensation committee.”

Our named executive officers (collectively, the “Named Executive Officers”) for 2017 were:

Named Executive Officer Title D. Bradley Childers President and Chief Executive Officer of Archrock GP LLC and Archrock Raymond K. Guba Interim Chief Financial Officer of Archrock GP LLC and Archrock Stephanie C. Hildebrandt Senior Vice President and General Counsel of Archrock GP LLC and Archrock and Secretary of Archrock Jason G. Ingersoll Vice President, Marketing and Sales of Archrock GP LLC and Archrock Robert E. Rice Senior Vice President and Chief Operating Officer of Archrock GP LLC and Archrock David S. Miller Former Senior Vice President and Chief Financial Officer of Archrock GP LLC and Archrock Donald C. Wayne Former Senior Vice President and General Counsel of Archrock GP LLC and Archrock and Secretary of Archrock

Mr. Ingersoll was appointed Senior Vice President, Marketing and Sales, in February 2018.

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Mr. Miller separated from Archrock on December 1, 2017, and Mr. Wayne resigned from his position on May 10, 2017. Following the departure of Mr. Miller on December 1, 2017, Mr. Guba has served as our Interim Chief Financial Officer pursuant to a services agreement between Archrock Services, L.P. and Tatum effective December 12, 2017. Mr. Guba is not an employee of us or Archrock and, as such, Mr. Guba is not compensated by Archrock. Archrock pays an hourly fee to Tatum for Mr. Guba's services and Mr. Guba is directly compensated by Tatum. The Tatum services agreement is described below under "Service Agreement - Raymond K. Guba."

Compensation Expense Allocations

Under the Omnibus Agreement, most costs associated with Archrock’s provision of services to us, including compensation of our Named Executive Officers, are allocated to us on a monthly basis in the manner that our general partner deems reasonable. During 2017, those allocations were generally made using a two-step process:

• First, Archrock allocated an appropriate portion of its total SG&A expenses among its business segments, including to its contract operations segment, based on headcount and estimated time spent in support of contract operations.

• Second, Archrock allocated to us a prorated portion of the SG&A expenses initially allocated to Archrock’s contract operations segment based upon the ratio of our total compression equipment horsepower to the sum of Archrock’s total compression equipment horsepower and our total compression equipment horsepower.

For 2017, there were no caps on the amount we were obligated to reimburse Archrock for SG&A expenses allocated to us, including compensation costs. See Part III, Item 13 (“Certain Relationships and Related Transactions, and Director Independence”) of this report for additional discussion of relationships and transactions we have with Archrock and the terms of the Omnibus Agreement.

During the year ended December 31, 2017, Archrock allocated to us the following percentages of Archrock compensation expenses incurred to provide the Named Executive Officers’ total compensation, including base salary, annual performance-based incentive compensation, Archrock stock awards, our phantom unit awards and other benefits:

Executive Officer		Percent of Named Executive Officer’s 2017 Total Compensation Allocated to the Partnership (%)
D. Bradley Childers		55.6
Stephanie C. Hildebrandt		63.3
Jason G. Ingersoll		63.3
Robert E. Rice		63.3
David S. Miller		55.6
Donald C. Wayne		63.3

Our Compensation Committee’s Structure and Responsibilities

Because our Named Executive Officers are also officers of Archrock, their compensation structure is established by the compensation committee of the board of directors of Archrock (the “Archrock Compensation Committee”). Our compensation committee’s primary responsibilities are to:

• Discharge the board of directors’ responsibilities relating to our executives’ compensation;

• Review and approve the manner in which Archrock allocates to us the compensation expense applicable to our Named Executive Officers;

• Oversee the Archrock Partners, L.P. 2017 Long-Term Incentive Plan (the “Partnership Plan”) and make awards thereunder;

• Review and approve compensation programs for our independent directors; and

• Produce an annual report relating to this compensation discussion and analysis for inclusion in our Annual Report on Form 10-K in accordance with the rules and regulations of the SEC.

Our compensation committee is comprised entirely of independent directors within the meaning of applicable NASDAQ rules. The current members of our compensation committee are James G. Crump, G. Stephen Finley and Edmund P. Segner, III.

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Compensation Philosophy and Objectives

The primary objectives of Archrock’s executive compensation program are to:

Pay Competitively	To attract, retain and motivate an effective management team with the level of expertise and experience needed to achieve consistent growth, profitability and return for equityholders, Named Executive Officers' total compensation should be competitive with that of comparably-sized companies within the oilfield services sector and, where applicable, across a variety of industries, as further described below in “How the Archrock Compensation Committee Determines Executive Compensation.”
Pay for Performance	Emphasis on performance-based, variable compensation is a critical component of the overall compensation philosophy. 84% of our Chief Executive Officer’s 2017 total direct compensation and approximately 68% of our other Named Executive Officers’ 2017 total direct compensation was variable, with realized value dependent upon annual financial performance or long-term Archrock stock price performance.
Equityholder Alignment	Alignment between our Named Executive Officers and equityholders is essential to long-term success. A competitive base salary ensures that Archrock can attract and retain the level of managerial talent necessary to achieve consistent growth and profitability and is, therefore, aligned with our and Archrock’s equtyholders’ interests. Emphasis on equity-based compensation and share ownership encourages executives to act strategically to drive sustainable long-term performance and enhance long-term equityholder value.

Elements of Compensation

Archrock’s executive compensation program is designed to align our Named Executive Officers’ pay with their individual performance and with Archrock’s performance in order to achieve growth, profitability and return for Archrock’s and our equityholders, and to attract and retain executives with the level of expertise and experience necessary to achieve business objectives while driving short- and long-term results. The key elements of our Named Executive Officers’ compensation and the primary objectives of each are as follows:

Key Elements of Compensation Description Pay Competitively Pay for Performance Equityholder Alignment Base salary Fixed cash incomeEstablishes a base level of compensation that is essential to attract and retain talent ü ü Annual performance-based incentive compensation Variable cash incentive award earned annuallyBased upon achievement of key annual financial, operational, safety, and individual performance goals that contribute to long-term growth in equityholder value ü ü ü Long-term incentive compensation (“LTI Awards”) Provided through a combination of restricted shares and performance units vesting over multiple yearsPromotes equityholder alignment by tying a significant portion of executive compensation directly to growth in equityholder value ü ü ü

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How the Archrock Compensation Committee Determines Executive Compensation

The Archrock Compensation Committee is responsible for establishing and overseeing compensation programs that are consistent with Archrock’s compensation philosophy. In carrying out this role, the Archrock Compensation Committee considers such factors as they deem relevant, including the following:

External Factors Internal Factors Data and analysis provided by the Archrock Compensation Committee’s independent compensation consultant Current and past total compensation, including an annual review of base salary, short-term incentive pay and the value of LTI Awards received Feedback provided from Archrock’s stockholders via its stockholder outreach and the results of Archrock’s advisory say-on-pay vote Archrock’s company performance and operating unit performance (where applicable), as well as each executive’s impact on performance The Chief Executive Officer’s recommendations (other than with respect to his own compensation) Each executive’s relative scope of responsibility and potential Individual performance and demonstrated leadership Internal pay equity considerations

Role of Compensation Consultant. For 2017, the Archrock Compensation Committee engaged Pearl Meyer, an independent third-party compensation consultant, to:

• provide data and analysis to inform the Archrock Compensation Committee in selecting an appropriate peer group;

• provide a review of market trends in executive compensation, including base salary, annual incentives, LTI Awards and total direct compensation; and

• provide information on how trends, new rules, regulations and laws impact executive and director compensation practice and administration.

For 2017, Pearl Meyer provided analysis of data derived from (i) proxy statements filed by the companies in Archrock’s peer group, as further described below, and (ii) surveys of the compensation practices of companies in the oilfield services industry, the broader energy industry and across a variety of industries, in each case with annual revenues comparable to Archrock. In performing its compensation analysis, Pearl Meyer generally placed more weight on the proxy compensation data for named executive officers at the peer companies than on the information derived from the broader compensation surveys.

Because many of Archrock’s direct competitors were not, during 2017, publicly traded or of a comparable size, its 2017 peer group included a diversity of oilfield services and related companies with primarily domestic operations and with revenues ranging from roughly $270 million to $5 billion. The Archrock Compensation Committee believes this peer group includes companies with which they may compete for technical and managerial talent and provides an appropriate reference point for assessing the competitiveness of Archrock’s compensation program. In addition, the Archrock Compensation Committee believes that the number of companies included in the peer group provides a blend of data that is useful both for determining the general positioning of executive compensation and for assessing Archrock’s performance based on total stockholder return over a multi-year period. The Archrock Compensation Committee intends to review annually the composition of the peer group, based on input from its compensation consultant, and will modify it as circumstances, including industry consolidation and other competitive forces, warrant.

Archrock’s 2017 peer group, selected by the Archrock Compensation Committee in consultation with Pearl Meyer, included:

Enlink Midstream, LLC NOW Inc. SemGroup Corporation Forum Energy Technologies, Inc. Oceaneering International, Inc. Superior Energy Services, Inc. Frank's International N.V. Oil States International, Inc. TETRA Technologies, Inc. Helmerich & Payne, Inc. Patterson-UTI Energy, Inc. USA Compression Partners, L.P. McDermott International, Inc. Pioneer Energy Services Corp. Willbros Group, Inc. Newpark Resources, Inc. RPC, Inc.

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The Archrock Compensation Committee utilized a peer group for purposes of evaluating the appropriateness of the 2017 executive compensation program for the first time since the spin-off of Archrock’s international contract operations, international aftermarket services and global fabrication businesses in November 2015 (the "Spin-off"). Due to the timing of the Spin-off, the Archrock Compensation Committee did not believe there was sufficient time to evaluate and select a peer group appropriate for Archrock in 2016.

Pearl Meyer also provided input to the Archrock Compensation Committee in their review and determination of the appropriate types and mix of long-term incentive awards and the performance factors for performance-based compensation awarded in 2017. In 2016, due to challenging market conditions, the value of our then Named Executive Officers' annual long-term incentive compensation was reduced by 10%. Based on the market data and input provided by Pearl Meyer for similar positions, the Archrock Compensation Committee determined to restore the value of long-term incentive compensation provided to our Named Executive Officers in 2017 and, in the case of Messrs. Ingersoll, Rice, Miller and Wayne, increased their long-term incentive compensation by an additional 2% to 6%. These changes placed our Named Executive Officers' long-term incentive compensation slightly below the market median on average. In addition, the data provided by Pearl Meyer supported the Archrock Compensation Committee's decision to increase the percentage of performance-based compensation as a percentage of total long-term compensation awarded to our Named Executive Officers in 2017 from 25% to 40% for Mr. Childers and from 25% to 30% for Messrs. Ingersoll, Rice, Miller and Wayne.

Following review and consultation with Pearl Meyer, the Archrock Compensation Committee has determined that Pearl Meyer is independent and that no conflict of interest, either currently or during 2017, results from this engagement. The Archrock Compensation Committee continues to monitor the independence of its compensation consultant on a periodic basis.

Role of Management. The most significant aspects of management’s, including the Chief Executive Officer’s, role in the compensation-setting process are:

• recommending compensation programs, compensation policies, compensation levels and incentive opportunities that are based on analysis provided by Archrock’s independent compensation consultant and are consistent with Archrock’s business strategies;

• preparing and distributing materials for Archrock Compensation Committee review and consideration;

• recommending corporate performance goals on which performance-based compensation will be based; and

• assisting in the evaluation of employee performance.

The Chief Executive Officer annually reviews the performance of our Named Executive Officers and recommends salary adjustments, annual cash incentives and LTI Awards for executives other than himself, which the Archrock Compensation Committee considers along with the other factors discussed above.

Base Salary

In light of challenging market conditions and efforts to reduce costs, effective August 2016, our Named Executive Officers agreed to a reduction in their base salaries by 10% pursuant to letter agreements entered into with Archrock (the "Compensation Letters"). Based on the competitive positioning of our Named Executive Officers' base salaries against companies in the peer group as well as improving market conditions, the Archrock Compensation Committee approved the termination of the Compensation Letters effective in August 2017, which resulted in the restoration of the pre-reduction base salary for each of Messrs. Childers, Ingersoll, Rice and Miller as indicated below.

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Executive Officer	Title	Base Salary Through July 2017 ($)	Base Salary Effective August 2017 ($)	Base Salary Effective Upon Date of Hire($)
D. Bradley Childers	President and Chief Executive Officer	720,000	800,000	—
Raymond K. Guba(1)	Interim Chief Financial Officer	—	—	—
Stephanie C. Hildebrandt(2)	Senior Vice President and General Counsel	—	—	390,000
Jason G. Ingersoll	Vice President, Marketing and Sales	270,000	300,000	—
Robert E. Rice	Senior Vice President and Chief Operating Officer	360,000	400,000	—
David S. Miller(3)	Former Senior Vice President and Chief Financial Officer	297,000	330,000	—
Donald C. Wayne(4)	Former Senior Vice President and General Counsel	337,500	—	—

(1) Mr. Guba serves as Interim Chief Financial Officer and is paid for his services directly by Tatum; as such, Mr. Guba is not paid a salary, bonus or granted equity by Archrock.

(2) Ms. Hildebrandt has served as Senior Vice President and General Counsel since August 7, 2017.

(3) Mr. Miller separated from Archrock on December 1, 2017.

(4) Mr. Wayne terminated his employment on May 10, 2017.

Annual Performance-Based Incentive Compensation

During the first quarter of each year, the Archrock Compensation Committee adopts a program to provide the short-term cash incentive element of our Named Executive Officers’ compensation for that year. In February 2017, the Archrock Compensation Committee adopted the short-term incentive program for 2017 (the “2017 Incentive Program”). Each Named Executive Officer’s cash incentive target was a specified percentage of his or her base salary in effect prior to the termination of the Compensation Letters in August 2017. The table below presents each Named Executive Officer's 2017 cash incentive target as a specified percentage of his or her base salary, as well as a potential payout assuming achievement of the Archrock performance factor at 100%.

Executive Officer	2017 CashIncentive Target(% of base salary)	2017 CashIncentive Target($)(1)
D. Bradley Childers	110	880,000
Raymond K. Guba (2)	—	—
Stephanie C. Hildebrandt	65	98,000
Jason G. Ingersoll	65	195,000
Robert E. Rice	70	280,000
David S. Miller (3)	70	231,000
Donald C. Wayne (4)	65	219,375

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(1) Assumes Archrock company and operating unit results and individual results (as discussed below) are achieved at 100%.

(2) Mr. Guba serves as Interim Chief Financial Officer and is paid for his services directly by Tatum; as such, Mr. Guba is not a participant in the 2017 Incentive Program.

(3) Mr. Miller, who separated from Archrock on December 1, 2017, did not receive payment under the 2017 Incentive Program as he was not employed by Archrock as of the payment date. Instead, as part of the cash severance payment made to Mr. Miller in connection with his separation, Mr. Miller received payment of his 2017 cash incentive award at target pursuant to his severance benefit agreement. Mr. Miller’s severance payments are described in more detail in the section below entitled "Potential Payments upon Termination or Change of Control - Payments to Mr. Miller Upon Separation."

(4) Mr. Wayne terminated his employment on May 10, 2017 and, therefore, he was ineligible for a payout under the 2017 Incentive Program.

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Each Named Executive Officer’s potential cash payout under the 2017 Incentive Program ranged from 0% to 200% of his or her incentive target. No payouts would be made unless Archrock company results, as shown below, exceeded 50% of target performance. Under the 2017 Incentive Program, the Archrock Compensation Committee determined payouts to the Named Executive Officers using the following formula:

Archrock Company Results. As shown in the table below, Archrock company results were achieved at a performance payout factor of 95%.

Performance Factor	TargetAchievement(100%)	Performance Achieved$	Payout Factor
Archrock’s Consolidated Operating Cash Flow ($ in millions)(1)calculated as Archrock’s consolidated EBITDA, as adjusted,(2) minus capital expenditures, cash taxes and cash interest, plus non-cash LTI, plus/minus the decrease/increase in working capital	$158	$155	95%

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(1) Certain benefits achieved from working capital reductions were excluded from the calculation of Archrock’s Consolidated Operating Cash Flow.

(2) Archrock’s EBITDA, as adjusted, a non-GAAP measure, is defined as net income (loss) excluding income (loss) from discontinued operations (net of tax), income taxes, interest expense, depreciation and amortization, long-lived asset impairment, restructuring and other charges, corporate office relocation costs, expensed acquisition and merger-related costs, indemnification (income) expense, net, restatement and other charges, debt extinguishment costs, and other items.

Archrock Operating Unit Results. Under the 2017 Incentive Program, Archrock’s Operating Unit results are set forth in the table below.

	Sales Unit				Services Unit				Non-Operational Functional Support Unit
	Applicable to Ingersoll				Applicable to Rice				Applicable to Hildebrandt and Wayne
Performance Factor	Weight		Payout Achieved		Weight		Payout Achieved		Weight		Payout Achieved
Safety - TRIR	10	%	10	%	10	%	10	%	10	%	10	%
Year-end horsepower	20	%	30	%
Contract compression bookings	35	%	53	%
AMS revenue	35	%	34	%
Business unit results					65	%	55	%
Make-ready shops results					25	%	21	%
Operating results									30	%	25	%
Sales results									30	%	39	%
SG&A target									30	%	30	%
Aggregate Operating Unit Results			127	%			86	%			104	%

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Archrock has not disclosed target levels with respect to the achievement of these operating unit performance factors because they are derived from internal analyses reflecting Archrock’s business strategy and will not otherwise be publicly disclosed. Archrock believes their disclosure would provide its competitors, customers and other third parties with significant insights regarding Archrock’s confidential business strategies that could cause Archrock substantial competitive harm.

Individual Performance. In early 2017, the Archrock Compensation Committee approved individual performance objectives for Mr. Childers related to Archrock’s financial and operational performance, strategic initiatives and company culture, as well as his demonstrated leadership ability.

Upon conclusion of fiscal 2017, the Archrock Compensation Committee considered Mr. Childers’ performance relative to the approved individual objectives. The Archrock Compensation Committee then reviewed its assessment of Mr. Childers' performance with him and with the full Archrock Board of Directors.

With input from Mr. Childers, the Archrock Compensation Committee also considered each Named Executive Officer's individual contribution toward Archrock company and/or Archrock operating unit performance during 2017 including, as individually applicable, implementation of operational improvements, contribution toward Archrock’s performance goals and initiatives and demonstrated leadership ability. In addition, the Archrock Compensation Committee considered the significant efforts of each of Ms. Hildebrandt and Messrs. Ingersoll and Rice to continue to achieve a high level of operating performance during a year of improving market conditions that challenges capital spending discipline, and creates pressure on selling, general and administrative expenses.

Following such assessments, the Archrock Compensation Committee determined that each of Ms. Hildebrandt and Messrs. Childers, Ingersoll and Rice met or exceeded expectations and, accordingly, achieved 100% of their respective individual performance levels for 2017. The Archrock Compensation Committee did not assess the performance of Mr. Guba, who joined Archrock in December 2017 and was not eligible to participate in the 2017 Incentive Program, or of Messrs. Miller and Wayne, who terminated their employment with Archrock prior to year-end.

2017 Incentive Program Payments. Following the end of fiscal year 2017, the Archrock Compensation Committee calculated the individual cash payments under the 2017 Incentive Program by multiplying the Named Executive Officers’ target cash incentives by the achievement percentages for the applicable Archrock company, operating unit and individual performance factors described above. The Archrock Compensation Committee, in its discretion, increased Ms. Hildebrandt’s payout from $96,525 to $98,000 based on her individual performance.

Executive Officer	2017 Cash Incentive Target1	x	Company Performance Factor Achieved	x	Operating Unit Performance Factor Achieved	x	Individual Performance Factor Achieved	=	Payout Earned(%)	=	Payout Earned ($)
D. Bradley Childers	880,000		95%		N/A		100%		95%		836,000
Stephanie C. Hildebrandt(1)	98,000		95%		104%		100%		99%		100,000
Jason G. Ingersoll	195,000		95%		127%		100%		120%		234,897
Robert E. Rice	280,000		95%		86%		100%		82%		229,026

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(1) For Ms. Hildebrandt, represents 2017 eligible earnings since her August 7, 2017 date of hire.

As previously indicated, Mr. Guba, who joined Archrock in December 2017 and was not eligible to participate in the 2017 Incentive Program, and Messrs. Miller and Wayne, who terminated their employment in December and May 2017, respectively, were not eligible for a payment under the 2017 Incentive Program. However, pursuant to his severance benefit agreement (described in more detail below under "Potential Payments upon Termination or Change in Control - Payments to Mr. Miller Upon Separation"), Mr. Miller received a payment of his 2017 cash incentive at target.

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Long-Term Incentive Compensation

During 2017, Archrock’s long-term incentive program consisted of the following LTI Awards:

Archrock Restricted Stock	Ÿ Time-vested awards that vest one-third per year Ÿ Encourages retention and incentivizes employees to work toward long-term performance goals by aligning their interests with stockholder interestsŸ Dividends are paid on unvested shares as and when they are paid to Archrock’s stockholders
Archrock Performance Units	Ÿ Performance-based awards that are earned based upon achievement of specific performance goals intended to drive long-term growth in stockholder value◦DCF Performance Units (as defined below) are earned based on Archrock’s distributable cash flow performance during 2017 and earned units vest one-third per year ◦TSR Performance Units (as defined below) are earned based on Archrock’s total stockholder return performance relative to its peers over a three-year period and earned units cliff-vest following conclusion of the performance periodŸ Payment Method◦DCF Performance Units are denominated in Archrock common stock but settled in cash based on the Archrock common stock price at each vesting date in order to help control dilution ◦TSR Performance Units are denominated in Archrock common stock and settled in such shares, complimentary to the underlying performance criteria and the value creation aspect of the awardŸ Dividends on performance-based awards are accrued during the applicable performance period and paid at vesting based on the actual number of units earned
Partnership Phantom Units	Ÿ Time-vested awards that vest one-third per year Ÿ Encourages a focus on growth objectives with respect to the PartnershipŸ Phantom units are settled in Partnership common unitsŸ Distributions are paid on unvested units as and when they are paid to Partnership unitholders

Long-Term Incentive Plans. Grants of Archrock restricted stock and performance awards during calendar year 2017 were made under the Archrock, Inc. 2013 Stock Incentive Plan (as amended, the “2013 Stock Incentive Plan”), which was approved by Archrock’s stockholders in April 2013. The 2013 Stock Incentive Plan is administered by the Archrock Compensation Committee. Awards of Partnership phantom units were made from the Archrock Partners, L.P. 2017 Long-Term Incentive Plan (the “Partnership Plan”), which is administered by our compensation committee.

Timing of Awards. Our compensation committee and Archrock’s Compensation Committee generally establish their schedules for making annual LTI Awards several months in advance, and does not make such awards based on knowledge of material nonpublic information. This practice results in awards typically being granted on a regular, predictable cycle, after earnings information has been disseminated to the marketplace. Equity-based awards are occasionally granted at other times during the year, such as upon the hiring of a new employee or following the promotion of an employee. In some instances, the respective compensation committees may be aware, at the time grants are made, of matters or potential developments that are not ripe for public disclosure at that time but that may result in public announcement of material information at a later date. LTI Awards are granted and valued based on the market closing price of Archrock’s common stock or our common units on the date of approval by the applicable compensation committee.

Named Executive Officers' 2017 LTI Awards. In considering the grant of 2017 LTI Awards, the Archrock Compensation Committee considered the factors discussed above under “How the Archrock Compensation Committee Determines Executive Compensation,” and also reviewed share utilization with respect to the 2013 Stock Incentive Plan, potential overhang and burn rate under various award scenarios. The Archrock Compensation Committee also considered the retention aspect of awards as well as performance metrics that balance short-term and long-term objectives. The following chart provides the total value of each Named Executive Officer's 2017 LTI Award and the number of shares and units awarded (in the case of performance-based units, listed at target payout).

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Executive	Target Long-Term Incentive Grant Value($)	Archrock Restricted Shares(#)	Archrock DCF Performance Units(#)	Archrock TSR Performance Units(#)	Partnership Units(#)
D. Bradley Childers	3,299,968	96,350	60,218	36,131	40,540
Raymond K. Guba	—	—	—	—	—
Stephanie C. Hildebrandt	549,998	54,187	—	—	—
Jason G. Ingersoll	349,961	12,773	5,109	2,554	4,299
Robert E. Rice	674,993	24,635	9,854	4,927	8,292
David S. Miller	574,977	20,985	8,394	4,197	7,063
Donald C. Wayne	459,991	20,985	8,394	4,197	—

2017 Performance-based Long-Term Incentive Awards

DCF Performance Units. DCF Performance Units may be earned based upon Archrock’s distributable cash flow during 2017 (the "DCF Performance Units"), with payout ranging from 0% to 200% of the total units granted. The percentage of each award of DCF Performance Units that was earned at the conclusion of fiscal year 2017 was based on the achievement of the performance factor as indicated in the chart below.

Performance Factor	Target Achievement(100%)	Performance Achieved	Payout Factor
Archrock’s 2017 Distributable Cash Flow Archrock’s EBITDA, as adjusted,(1) minus maintenance and other capital expenditures, minus cash taxes, minus cash interest, plus non-cash LTI	$164 million	$152 million	83%

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(1) Archrock’s EBITDA, as adjusted, a non-GAAP measure, is defined as net income (loss) excluding income (loss) from discontinued operations (net of tax), income taxes, interest expense, depreciation and amortization, long-lived asset impairment, restructuring and other charges, corporate office relocation costs, expensed acquisition and merger-related costs, indemnification (income) expense, net, restatement and other charges, debt extinguishment costs, and other items.

Following the conclusion of fiscal year 2017, earned DCF Performance Units are subject to a time-based vesting schedule pursuant to which one-third of the earned DCF Performance Units subject to the award will vest on each of August 20, 2018, August 20, 2019 and August 20, 2020, subject to continued employment through the applicable vesting date. In addition, the award is subject to accelerated vesting as described below under “Potential Payments upon Termination or Change of Control”. Earned DCF Performance Units are payable in cash based on the market closing price of Archrock’s common stock on the applicable vesting date.

TSR Performance Units. TSR Performance Units may be earned based upon Archrock’s three-year total stockholder return (the "TSR Performance Units"), with payout ranging between 0% and 200% of the units granted. The percentage of each award of TSR Performance Units that will be earned will be determined following the three-year performance period of January 1, 2017 through December 31, 2019, based on Archrock’s TSR performance rank relative to the seventeen companies in its 2017 peer group (the "Comparator Group").

Performance Factor	Threshold(30%)	Target (100%)	Maximum(200%)
Archrock Total Stockholder Return The Average Fair Market Value(1) at the beginning of the period plus dividends paid over the performance period divided by the Average Fair Market Value at the end of the performance period	TSR rank = 16th	TSR rank = 9th(2)	TSR rank = 1st

_______________

(1) Average Fair Market Value as of any given date is the average fair market value of a share of Archrock common stock during the 20 consecutive trading dates ending on and including such date.

(2) Payout at target assumes no changes in the Comparator Group. In the event a company in the Comparator Group becomes insolvent or liquidates, that company shall remain in the Comparator Group, but will be moved to the lowest rank in the Comparator Group. In the event a company is acquired or merged into another company and is not the surviving company, or as a result of any other corporate transaction, such company shall be removed from the Comparator Group and the percentile payouts shall be ratably adjusted.

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As discussed above, based on Archrock’s ordinal rank in the Comparator Group at the conclusion of the three-year performance period, a number of TSR Performance Units ranging from 0% to 200% of the total number of TSR Performance Units granted will become earned. If Archrock’s TSR rank falls between the levels specified in the chart, the percentage of TSR Performance Units that will be earned will be determined using straight-line interpolation between such levels. No payout will be earned if Archrock’s TSR rank is below threshold level. The earned TSR Performance Units are also subject to three-year cliff vesting on August 20, 2020, subject to continued employment through the vesting date. In addition, the award is subject to accelerated vesting as described below under “Potential Payments upon Termination or Change of Control”. Each earned TSR Performance Unit is payable as a share of Archrock common stock upon vesting.

Partnership Phantom Units. During 2017, Messrs. Childers, Ingersoll, Rice and Miller received an award of Partnership phantom units with DERs, granted by our compensation committee. The Partnership phantom units are subject to a time-based vesting schedule pursuant to which one-third of the award will vest on each of August 20, 2018, August 20, 2019 and August 20, 2020, subject to continued service through each vest date. In addition, the award is subject to accelerated vesting as described below under “Potential Payments upon Termination or Change of Control”, subject to the approval of our compensation committee. Each earned Partnership Phantom Unit is payable as a Partnership common unit upon vesting.

Inducement Restricted Stock Award. In connection with the commencement of her employment with Archrock on August 7, 2017, Ms. Hildebrandt was granted a one-time restricted stock award with a grant-date value of $550,000. The terms and conditions of this restricted stock award are described in more detail below under "Executive Employment Letters" and as set forth in the Grants of Plan-Based Awards Table for 2017.

Retirement Savings, Health and Welfare Benefits

Our Named Executive Officers (other than Mr. Guba) participate in Archrock’s company-sponsored benefit programs on generally the same basis as Archrock’s other salaried employees. These benefits are designed to provide retirement income and protection against the financial hardship that can result from illness, disability or death.

Retirement Savings Plan. The Archrock 401(k) Plan allows certain Archrock employees who are U.S. citizens, including our Named Executive Officers (other than Mr. Guba), to defer a portion of their eligible salary, up to the Code maximum deferral amount, on a pre-tax basis or on a post-tax (Roth) basis. Participants make contributions to an account maintained by an independent trustee and direct how those contributions are invested. Archrock matches 100% of a participant’s contribution up to a maximum of 5% of his or her annual eligible compensation. Participants vest in Archrock’s matching contributions after two years of employment.

Deferred Compensation Plan. The Archrock Deferred Compensation Plan (the “Deferred Compensation Plan”) allows certain key Archrock employees who are U.S. citizens, including our Named Executive Officers (other than Mr. Guba), to defer receipt of their compensation, including up to 100% of their salaries and bonuses, and be credited with Archrock contributions designed to serve as a make-up for the portion of the employer-matching contribution that cannot be made under the Archrock 401(k) Plan due to Code limits. Participants generally must make elections relating to compensation deferrals and plan distributions in the year preceding that in which the compensation is earned. Contributions to the Deferred Compensation Plan are self-directed investments in the various funds available under the plan. There are thus no interest calculations or earnings measures other than the performance of the investment funds selected by the participant. Participants direct how their contributions are invested and may change these elections at any time, provided that such changes in elections comply with Section 409A of the Code.

Health and Welfare Benefit Plans. Archrock maintains a standard complement of health and welfare benefit plans for its employees, including our Named Executive Officers (other than Mr. Guba), which provide medical, dental and vision benefits, health savings and flexible spending accounts, short-term and long-term disability insurance, accidental death and dismemberment insurance and life insurance coverage. These benefits are provided to our Named Executive Officers on the same terms and conditions as they are provided to Archrock’s other employees.

Perquisites. As in prior years, the only perquisite provided by Archrock to our Named Executive Officers (other than Mr. Guba) was tax preparation and planning services, a taxable benefit. Archrock’s policy prohibits tax gross-ups on perquisites.

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Executive Employment Letters

Employment Letters. On November 3, 2015, each of Messrs. Childers, Ingersoll, Rice, Miller and Wayne, who then served as our Named Executive Officers, and on August 7, 2017, Ms. Hildebrandt, entered into employment letters with Archrock which set forth the applicable executive’s title and reporting relationship, base salary, annual target incentive and eligibility for annual equity awards (the “Employment Letters”). Under the Employment Letters, each such Named Executive Officer is eligible for an annual base salary, annual short-term incentive target and annual equity award value, which annual short-term incentive and annual equity award value are subject to annual review in the discretion of Archrock’s Compensation Committee. In addition, each Employment Letter provides that the applicable executive is eligible to participate in all employee benefit plans maintained by Archrock for the benefit of its executives generally. Pursuant to their respective Employment Letters, (i) Mr. Ingersoll received a cash retention payment of $76,160 in 2017, which was designed to encourage the continued service of Mr. Ingersoll up to and following the Spin-off, and (ii) Ms. Hildebrandt received a one-time grant of restricted stock with a grant date value of $550,000 as an inducement to her commencement of employment with Archrock, which is subject to three-year ratable vesting.

Severance Benefit Agreements and Change of Control Arrangements

Severance Benefit and Change of Control Agreements. Archrock has entered into severance benefit agreements and change of control agreements with each of our Named Executive Officers (other than Mr. Guba). Archrock’s Compensation Committee believes that severance and change of control agreements are necessary to attract and retain executive talent and are, therefore, a customary part of executive compensation. The change of control agreements are structured as “double trigger” agreements. In other words, the change of control alone does not trigger benefits; rather, benefits are paid only if the executive incurs a qualifying termination of employment within six months before or 18 months following a change of control. See “Potential Payments upon Termination or Change of Control,” below, for a description of the terms of the change of control agreements and the severance benefit agreements with our Named Executive Officers during 2017, as well as estimates of the potential payouts under those agreements.

Equity Plans. All outstanding awards granted to Archrock employees, including our Named Executive Officers, under the 2013 Stock Incentive Plan and the Partnership Plan are structured as “double trigger” arrangements - that is, the grantee is only entitled to accelerated vesting in connection with a change in control if the grantee incurs a qualifying termination of employment within 18 months following the change in control. See “Potential Payments upon Termination or Change of Control,” below, for more information about equity vesting under various circumstances.

Service Agreement - Raymond K. Guba

Archrock entered into an interim services agreement (the "Service Agreement") with Tatum pursuant to which Mr. Guba has provided services as Interim Chief Financial Officer since December 12, 2017. As such, Mr. Guba does not receive a salary, is not currently eligible for bonuses or equity and does not have an employment agreement, severance agreement or change of control agreement with Archrock. Under the terms of the Service Agreement, Archrock pays Tatum an hourly rate of $345 for Mr. Guba's services. In addition, the Service Agreement provides for the reimbursement of Mr. Guba's reasonable and customary business expenses. The amount of professional fees paid by Archrock to Tatum corresponding to Mr. Guba's service as Interim Chief Financial Officer in fiscal 2017 was $28,290 plus a security deposit of $41,400, and the amount of expenses covered or reimbursed during this time period was $274. We nor Archrock have any prior relationships with Tatum.

Other Policies and Considerations

Unit Ownership Requirements. We do not have any policy or guidelines that require specified ownership of our common units by our directors or executive officers or any unit retention guidelines applicable to equity-based awards granted to directors or executive officers. As of February 15, 2018, our independent directors collectively held 102,321 common units, and our current Named Executive Officers collectively held 100,324 common units and 146,626 unvested phantom units with DERs.

Prohibition on Hedging and Pledging. Archrock’s policy prohibits all employees and directors from entering into any transaction designed to hedge or offset any decrease in the market value of Archrock’s or our equity securities, including purchasing financial instruments (such as variable forward contracts, equity swaps, collars or exchange funds), or otherwise trading in market options (such as puts or calls), warrants, or other derivative instruments of our equity securities. In addition, our Named Executive Officers and directors may not pledge, hypothecate or otherwise encumber Archrock’s or our equity securities as collateral for indebtedness.

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Tax and Accounting Considerations

Section 162(m) of the Code. As we are a partnership and not a corporation taxable as such for U.S. federal income tax purposes, we are not subject to the executive compensation tax deductible limitations of Section 162(m) of the Code. However, as Archrock has an ownership interest in our equity securities, our compensation committee has historically been mindful of the impact that Section 162(m) may have on compensatory deductions passed through to Archrock. In light of the repeal of the performance-based compensation exception to Section 162(m) of the Code for tax years beginning after December 31, 2017, the Archrock Compensation Committee expects in the future to approve compensation that is non-deductible for income tax purposes.

Section 409A of the Code. Section 409A of the Code requires that “nonqualified deferred compensation” be deferred and paid under plans or arrangements that satisfy the requirements of the statute with respect to the timing of deferral elections, timing of payments and certain other matters. Failure to satisfy these requirements can expose employees and directors to accelerated income tax liabilities, substantial additional taxes and interest on their vested compensation under such plans. Accordingly, as a general matter, it is Archrock’s intention to design and administer its compensation and benefit plans and arrangements for all of its employees and directors, including our Named Executive Officers, so that they are either exempt from, or satisfy the requirements of, Section 409A of the Code.

Accounting for Stock-Based and Unit-Based Compensation. We and Archrock have followed Financial Accounting Standards Board Accounting Standards Codification 718, “Stock Compensation” (“ASC 718”) in accounting for stock-based and unit-based compensation awards. ASC 718 requires companies to calculate the grant date “fair value” of their stock-based and unit-based awards using a variety of assumptions. ASC 718 also requires companies to recognize the compensation cost of their stock-based and unit-based awards in their income statements over the period that an employee is required to render service in exchange for the award. Archrock expects that it will regularly consider the accounting implications of significant compensation decisions, especially in connection with decisions that relate to its and our equity incentive award plans and programs. As accounting standards change, Archrock may revise certain programs to appropriately align accounting expenses of its and our equity awards with Archrock’s overall executive compensation philosophy and objectives.

Compensation Committee Report

The compensation committee of the board of directors of Archrock GP LLC has reviewed and discussed the Compensation Discussion and Analysis required by Item 402(b) of Regulation S-K with management. Based on such review and discussions, the compensation committee recommended to the board of directors that the Compensation Discussion and Analysis be included in our Annual Report on Form 10-K.

Submitted by the Compensation Committee

G. Stephen Finley

James G. Crump

Edmund P. Segner, III, Chair

COMPENSATION TABLES

Summary Compensation Table for 2017

The following table shows the compensation paid during the years shown to our Named Executive Officers. The numbers presented below are the full amounts received by each Named Executive Officer and have not been adjusted to reflect the amount allocated to us.

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Name and Title	Year	Salary ($)(1)	Bonus ($)(2)	Stock Awards ($)(3)	Option Awards ($)	Non-Equity Incentive Plan Compensation ($)(4)		All Other Compensation ($)(5)	Total ($)
D. Bradley Childers,	2017	750,769	—	3,299,968	—	836,000		395,452	5,282,189
President and Chief	2016	769,231	—	2,999,997	—	753,000	(6)	383,376	4,905,604
Executive Officer	2015	800,000	—	5,300,002	—	500,000		205,409	6,805,411
Raymond K. Guba, (7)	2017	—	—	—	—	—		—	—
Interim Chief Financial Officer
Stephanie C. Hildebrandt, (8)	2017	150,000	—	549,998	—	100,000		21,005	821,003
Senior Vice President and
General Counsel
Jason G. Ingersoll,	2017	281,539	76,160	349,961	—	234,897		53,224	995,781
Senior Vice President, Marketing	2016	288,462	73,920	299,999	—	130,000		40,260	832,641
and Sales
Robert E. Rice,	2017	375,385	—	674,993	—	229,026		104,639	1,384,043
Senior Vice President	2016	384,616	—	600,005	—	225,000		104,523	1,314,144
and Chief Operating Officer	2015	400,001	396,039	1,453,969	—	181,000		57,257	2,488,266
David S. Miller,	2017	290,654	—	574,977	—	—		861,092	1,726,723
Former Senior Vice President and	2016	317,309	—	499,999	—	210,000		79,004	1,106,312
Chief Financial Officer	2015	330,000	132,027	817,985	—	325,000		44,809	1,649,821
Donald C. Wayne,	2017	133,702	—	459,991	—	—		100,818	694,511
Former Senior Vice President	2016	360,577	—	499,999	—	200,000		74,428	1,135,004
and General Counsel	2015	375,001	132,030	817,984	—	350,000		44,822	1,719,837

(1) Amounts reported in this column reflect base salaries earned on a fiscal year basis.

(2) The amount in this column for 2017 represents a cash retention payment awarded in 2015, pursuant to Mr. Ingersoll’s Employment Letter, and was designed to encourage continued service of Mr. Ingersoll up to and following the Spin-off.

(3) The amounts in this column for 2017 represent the grant date fair value of (i) restricted shares of Archrock common stock, (ii) DCF Performance Units at target level, (iii) TSR Performance Units at target level, and (iv) Partnership phantom units, awarded and recognized by the Partnership. The grant date fair values of the 2017 Performance Units at maximum level were as follows:

Named Executive Officer	DCF Performance Units($)	TSR Performance Units($)
D. Bradley Childers	1,649,973	989,989
Raymond K. Guba	—	—
Stephanie C. Hildebrandt	—	—
Jason G. Ingersoll	139,987	69,980
Robert E. Rice	270,000	135,000
David S. Miller	229,996	114,998
Donald C. Wayne	229,996	114,998

The grant date fair value of these awards was calculated in accordance with ASC 718. For a discussion of valuation assumptions, see Note 16 and Note 9, respectively, to the consolidated financial statements in Archrock’s and the Partnership's Annual Report on Form 10-K for the year ended December 31, 2017.

(4) For Ms. Hildebrandt and Messrs. Childers, Ingersoll and Rice, the amounts in this column for 2017 represent cash payments under the 2017 Incentive Program, which covered the compensation measurement and performance year ended December 31, 2017, and were paid during the first quarter of 2018.

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(5) The amounts in this column for 2017 include the following:

Name	401(k) PlanCompanyContribution($)(a)	DeferredCompensation PlanCompany Contribution($)(b)	DERs /Dividends($)(c)	Other($)(d)(e)(f)	Total($)
D. Bradley Childers	9,450	5,549	374,053	6,400	395,452
Raymond K. Guba	—	—	—	—	—
Stephanie C. Hildebrandt	6,750	750	13,005	500	21,005
Jason G. Ingersoll	9,236	6,351	34,281	3,356	53,224
Robert E. Rice	9,658	7,523	82,608	4,850	104,639
David S. Miller	9,621	—	61,691	789,780	861,092
Donald C. Wayne	9,450	—	26,868	64,500	100,818

(a) The amounts shown represent Archrock’s matching contributions for 2017.

(b) Our Named Executive Officers could contribute up to 100% of their base pay and bonus to the Archrock Deferred Compensation Plan, and Archrock made certain matching contributions designed to serve as a make-up for the portion of the employer matching contributions that cannot be made under its 401(k) plan due to Code limits.

(c) Represents cash payments pursuant to (i) dividends on unvested restricted shares of Archrock’s common stock awarded under the 2013 Stock Incentive Plan, as amended, (ii) dividend equivalents accrued in 2017 which were paid in March 2018 on unvested DCF Performance Units awarded under the 2013 Stock Incentive Plan as finally determined by the Archrock Compensation Committee following conclusion of the 2017 performance period, (iii) dividend equivalents accrued on unvested TSR Performance Units during 2017 based on target performance, the payment of which will be dependent on the number of such units earned during the three-year performance period ending on December 31, 2019, subject also to vesting on August 20, 2020; and (iv) DERs on unvested Partnership phantom units awarded under the Partnership Plan.

(d) Represents taxable reimbursement of tax preparation and financial planning services and a payment by Archrock ($1,000 for Messrs. Ingersoll, Rice and Miller and $500 for Ms. Hildebrandt) to their individual health savings accounts, provided to all Archrock employees who elected to open such an account.

(e) For Mr. Miller, also represents the severance payment and benefits payable to him by Archrock upon his December 1, 2017 separation consisting of (i) a lump-sum cash payment of $773,014, and (ii) reimbursement for Archrock’s portion of health and welfare premiums under COBRA for period of twelve months valued at $14,674.

(f) For Mr. Wayne, also represents the payment by Archrock of consulting fees totaling $60,000 for services provided from his date of termination, May 10, 2017 through December 31, 2017.

(6) The amount in this column for 2016 represents the payment Mr. Childers would have received had he not voluntarily waived payment. Mr. Childers received no payment for the compensation measurement and performance period ended December 31, 2016.

(7) Mr. Guba serves as Interim Chief Financial Officer pursuant to the terms of the Services Agreement between Archrock and Tatum and is compensated for his services by Tatum; as such, Mr. Guba is not paid a salary or bonus or granted equity by Archrock.

(8) Ms. Hildebrandt has served as Senior Vice President and General Counsel since August 7, 2017.

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Grants of Plan-Based Awards for 2017

The following table shows the short- and long-term incentive plan awards granted to our Named Executive Officers in 2017. The numbers presented below are the full amounts granted to each Named Executive Officer and have not been adjusted to reflect the amount allocated to us.

		Estimated Possible PayoutsUnder Non-EquityIncentive Plan Awards(1)			Estimated Possible PayoutsUnder EquityIncentive Plan Awards(2)			All OtherStockAwards:Number ofShares ofStock or Units (#)	All OtherOptionAwards:Number ofSecuritiesUnderlying Options(#)	Exerciseor BasePrice ofOption Awards($/SH)	Grant DateFairValue ofStock andOption Awards($)(3)
Name	GrantDate	Threshold($)	Target($)	Maximum($)	Threshold(#)	Target(#)	Maximum(#)
D. Bradley Childers	3/3/2017	—	880,000	1,760,000	—	60,218	120,436		—	—	824,987
	3/3/2017				—	36,131	72,262		—	—	494,995
	3/3/2017							96,350(4)			1,319,995
	4/26/2017							40,540(5)			659,991
Raymond K. Guba		—	—	—	—	—	—	—	—	—	—
Stephanie C. Hildebrandt	8/7/2017	—	98,000	196,000	—	—	—	54,187(4)	—	—	549,998
Jason G. Ingersoll	3/3/2017	—	195,000	390,000	—	5,109	10,218		—	—	69,993
	3/3/2017				—	2,554	5,108		—	—	34,990
	3/3/2017							12,773(4)			174,990
	3/3/2017							4,299(5)			69,988
Robert E. Rice	3/3/2017	—	280,000	560,000	—	9,854	19,708		—	—	135,000
	3/3/2017				—	4,927	9,854		—	—	67,500
	3/3/2017							24,635(4)			337,500
	4/26/2017							8,292(5)			134,994
David S. Miller	3/3/2017	—	231,000	462,000	—	8,394	16,788		—	—	114,998
	3/3/2017				—	4,197	8,394		—	—	57,499
	3/3/2017							20,985(4)			287,495
	4/26/2017							7,063(5)			114,986
Donald C. Wayne	3/3/2017	—	219,375	438,750	—	8,394	16,788		—	—	114,998
	3/3/2017				—	4,197	8,394		—	—	57,499
	3/3/2017							20,985(4)			287,495

(1) The amounts in these columns show the range of potential payouts under the 2017 Incentive Program. The actual payouts under the plan were determined in February 2018 and will be paid in March 2018, as shown in the Summary Compensation Table for 2017, above.

(2) The amounts in these columns show the range of potential payouts of performance units awarded as part of the 2017 LTI Award. “Target” is 100% of the number of 2017 Performance Units awarded. “Threshold” is the lowest possible payout (0% of the grant), and “Maximum” is the highest possible payout (200% of the grant). See also “Long-Term Incentive Compensation - DCF Performance Units” and "Long-Term Incentive Compensation - TSR Performance Units" for more information regarding these awards.

(3) The grant date fair value of performance units, restricted stock, and Partnership phantom units is calculated in accordance with ASC 718. For a discussion of valuation assumptions, see Note16 and Note 9 (Stock-Based Compensation and Awards), respectively, to the consolidated financial statements in Archrock’s and our Annual Report on Form 10-K for the year ended December 31, 2017.

(4) Shares of restricted stock awarded under the 2013 Stock Incentive Plan that vest one-third per year over a three-year period, subject to continued service through each vesting date.

(5) Partnership phantom units awarded under the Partnership Plan that vest one-third per year over a three-year period, subject to continued service through each vesting date.

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Outstanding Equity Awards at Fiscal Year-End for 2017

The following table shows our Named Executive Officers’ equity awards and equity-based awards denominated in Archrock common stock and Partnership common units outstanding at December 31, 2017. The numbers presented below are the full amounts received by each Named Executive Officer and have not been adjusted to reflect the amount allocated to us.

	Option Awards				Stock Awards
Name	Number ofSecuritiesUnderlyingUnexercisedOptions(#)Exercisable	Number ofSecuritiesUnderlyingUnexercisedOptions(#)Unexercisable	OptionExercisePrice($)	OptionExpirationDate	Number ofShares orUnits ofStock ThatHave NotVested(#)	MarketValue of Shares orUnits ofStockThatHave NotVested($)	EquityIncentive PlanAwards: Number ofUnearnedShares, Units orOther RightsThat Have NotYet Vested(#)	EquityIncentive PlanAwards:Market or Payout Valueof UnearnedShares, Unitsor Other RightsThat Have NotYet Vested($)
D. Bradley Childers	33,772		13.96	3/4/2018	294,358(1)	3,090,759(2)	11,268(3)	118,314(2)
	219,258		6.25	12/12/2018	113,161(4)	1,347,748(5)	99,359(6)	1,043,270(2)
	90,404		15.32	3/4/2020			49,980(7)	524,790(2)
	63,891		25.18	3/4/2021			36,131(8)	379,376(2)
Raymond K. Guba
Stephanie C. Hildebrandt					54,187(1)	568,964(2)
Jason G. Ingersoll					32,403(1)	340,232(2)	802(3)	8,421(2)
					10,676(4)	127,151(5)	9,935(6)	104,318(2)
							4,240(7)	44,520(2)
							2,554(8)	26,817(2)
Robert E. Rice	3,996		13.96	3/4/2018	64,133(1)	673,397(2)	2,219(3)	23,300(2)
	29,855		8.79	3/4/2019	22,789(4)	271,417(5)	19,872(6)	208,656(2)
	18,734		15.32	3/4/2020			8,178(7)	85,869(2)
	13,835		25.18	3/4/2021			4,927(8)	51,734(2)
David S. Miller	13,162		13.96	3/1/2018
Donald C. Wayne

(1) Includes shares of Archrock restricted stock awarded under the 2013 Stock Incentive Plan that vest at the rate of one-third per year beginning on the initial vesting date shown below. All awards are subject to the applicable individual’s continued service through each vesting date.

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Name	Unvested Shares	Initial Vesting Date
D. Bradley Childers	33,805	3/4/2016
	164,203	3/4/2017
	96,350	8/20/2018
Stephanie C. Hildebrandt	54,187	8/20/2018
Jason G. Ingersoll	3,210	3/4/2016
	16,420	3/4/2017
	12,773	8/20/2018
Robert E. Rice	6,658	3/4/2016
	32,840	3/4/2017
	24,635	8/20/2018

(2) Based on the market closing price of Archrock’s common stock on December 29, 2017: $10.50.

(3) Archrock performance units awarded under the 2013 Stock Incentive Plan that vest at the rate of one-third per year beginning on March 4, 2016, subject to continued service through each vesting date. Amounts shown are the actual number of units earned, as determined by the Archrock Compensation Committee following the conclusion of the applicable performance period.

(4) Phantom units awarded under the Partnership Plan that vest at the rate of one-third per year beginning on the initial vesting date shown below, subject to continued service through each vesting date.

Name	Unvested Units	Initial Vesting Date
D. Bradley Childers	8,846	3/4/2016
	63,775	3/4/2017
	40,540	8/20/2018
Jason G. Ingersoll	6,377	3/4/2017
	4,299	8/20/2018
Robert E. Rice	1,742	3/4/2016
	12,755	3/4/2017
	8,292	8/20/2018

(5) Based on the market closing price of the Partnership’s common units on December 29, 2017: $11.91.

(6) Archrock performance units awarded under the 2013 Stock Incentive Plan that vest at the rate of one-third per year beginning on March 4, 2017, subject to continued service through each vesting date. Amounts shown are the actual number of units earned, as determined by the Archrock Compensation Committee following the conclusion of the applicable performance period.

(7) Archrock DCF Performance Units awarded under the 2013 Stock Incentive Plan that vest at the rate of one-third per year beginning on August 20, 2018, subject to continued service through each vesting date. Amounts shown are the actual number of units earned, as determined by the Archrock Compensation Committee following the conclusion of the 2017 performance period.

(8) Archrock TSR Performance Units awarded under the 2013 Stock Incentive Plan that cliff vest on August 20, 2020, subject to continued service through the vest date. Amounts shown are the number of units awarded at target performance. The number of actual units paid will be determined by the Archrock Compensation Committee following the conclusion of the three-year performance period, January 1, 2017 through December 31, 2019.

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Option Exercises and Stock Vested for 2017

The following table shows the value realized by the Named Executive Officers upon stock option exercises and vesting of equity awards covering Archrock common stock and Partnership common units during 2017. The value realized upon vesting represents the total value to each Named Executive Officer and does not represent the amount allocated to us.

	Option Awards		Stock Awards
Name	Number of Shares Acquired on Exercise (#)	Value Realized on Exercise ($)	Number of Shares and Units Acquired on Vesting (#)(1)	Value Realized on Vesting ($)(2)
D. Bradley Childers	—	—	292,996	4,053,261
Raymond K. Guba	—	—	—	—
Stephanie C. Hildebrandt	—	—	—	—
Jason G. Ingersoll	—	—	22,262	317,363
Robert E. Rice	—	—	79,482	1,036,371
David S. Miller	—	—	103,397	1,221,019
Donald C. Wayne	—	—	41,232	587,832

(1) Includes Archrock restricted stock and cash-settled performance units and Partnership phantom units that vested during 2017.

(2) The value realized for vested awards was determined by multiplying the fair market value of Archrock’s common stock (the market closing price of Archrock common stock on the vesting date) or Partnership phantom units (the market closing price of the Partnership’s common units on the vesting date) by the number of shares or units that vested. Shares and units vested on various dates throughout the year; therefore, the value listed represents the aggregate value of all shares and units that vested for each Named Executive Officer in 2017.

Nonqualified Deferred Compensation for 2017

The following table shows the Named Executive Officers’ compensation for 2017 under Archrock’s nonqualified deferred compensation plan.

Name	Executive Contributions in Last Fiscal Year ($)	Company Contributions in Last Fiscal Year ($)(1)	Aggregate Earnings (Losses) in Last Fiscal Year ($)	Aggregate Withdrawals/ Distributions ($)	Aggregate Balance at Last Fiscal Year End ($)
D. Bradley Childers	244	5,549	42,317	—	309,071
Raymond K. Guba	—	—	—	—	—
Stephanie C. Hildebrandt	—	750	—	—	—
Jason G. Ingersoll	—	6,351	1,210	—	23,416
Robert E. Rice	—	7,523	273	—	16,802
David S. Miller	681	—	180	—	11,232
Donald C. Wayne	744	—	4,515	70,689	—

(1) The amounts in this column represent Archrock’s contributions to each of Messrs. Childers, Ingersoll, Miller, Rice and Wayne's Deferred Compensation Plan account earned in 2017 but paid in the first quarter of 2018. These amounts are included in “All Other Compensation” in the Summary Compensation Table for 2017, above, but are not included in “Aggregate Balance at Last Fiscal Year End.”

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Under the Archrock Deferred Compensation Plan, eligible Archrock employees are permitted to defer receipt of up to 100% of their base salary, annual bonus and, if designated by the plan administrator, regular commissions. Archrock also makes certain employer matching contributions designed to serve as a make-up for the portion of the employer matching contributions that cannot be made under the 401(k) plan due to Code limits. The amounts deferred under each participant’s Archrock Deferred Compensation Plan account are deemed to be invested in investment alternatives chosen by the participant from a range of choices established by the plan administrator. The balances of participant accounts are adjusted to reflect the gains or losses that would have been obtained if the participant contributions had actually been invested in the applicable investment alternatives.

Participants may elect to defer the distribution of their account balances until the occurrence of a specified future date or event, including: (i) a future date while the participant is employed by Archrock, as specified by the participant, (ii) the participant’s separation from service (within the meaning of Section 409A of the Code), including due to death, or (iii) the participant’s disability. Participants may also elect whether to receive distributions of their account balances in a single lump-sum amount or in annual installments to be paid over a period of two to ten years.

Payment of a participant’s account will be made or commence, as applicable, as follows:

Ÿ for lump sum payments, on the earlier of: (x) in the case of a specified in-service date, January 1 of such year and (y) in the case of a separation from service or disability, the date of the participant’s separation of service or, if earlier, disability and

Ÿ for installment payments, the earlier of: (x) in the case of a specified in-service date, January 1 of such year and (y) in the case of a separation from service or disability, January 1 of the calendar year immediately following the date of the participant’s separation of service or, if earlier, disability.

The Archrock Deferred Compensation Plan is administered by Archrock’s Compensation Committee. The Archrock Deferred Compensation Plan is an unfunded plan for tax purposes and for purposes of Title I of the Employee Retirement Income Security Act of 1974, as amended. Archrock has also established a “rabbi trust” to satisfy its obligations under the Deferred Compensation Plan.

Potential Payments upon Termination or Change of Control

Severance Benefit Agreements. Archrock has entered into a severance benefit agreement with each of our Named Executive Officers (other than Mr. Guba). Each such agreement provides that if the executive’s employment is terminated by Archrock without cause or by the executive with good reason at any time through the term of the agreement (one year, to be automatically renewed for successive one-year periods until notice of non-renewal is given by either party), he or she will receive a lump sum payment in cash on the 35th day after the termination date equal to the sum of:

• his or her annual base salary then in effect;

• his or her target annual incentive bonus opportunity for the termination year;

• a pro-rated portion of his or her target annual incentive bonus opportunity for the termination year based on the length of time during which he or she was employed during such year; and

• any earned but unpaid annual incentive award for the fiscal year ending prior to the termination date.

In addition, the executive would be entitled to:

• the accelerated vesting as of the termination date of that portion of his or her outstanding unvested (i) Archrock equity, equity-based or cash awards, and (ii) Partnership phantom units (subject to the consent of our compensation committee), in each case, that was scheduled to vest on the next vesting date immediately following the termination date. In the case of outstanding performance shares or units which are based in common stock of Archrock and subject to time-based cliff vesting at the end of a three-year performance period (including the TSR Performance Units), such shares or units shall vest with respect to one-third (if the termination date occurs in the first year of the performance period), two-thirds (if the termination date occurs in the second year of the performance period) or 100% (if the termination date occurs in the third year of the performance period) of the underlying performance shares or units; and

• continued coverage under Archrock’s medical benefit plans for the executive and his or her eligible dependents for up to one year following the termination date.

Each executive’s entitlement to the payments and benefits under his or her severance benefit agreement is subject to his or her execution of a waiver and release for Archrock’s benefit. In addition, each executive is subject to non-disparagement restrictions following termination.

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Change of Control Agreements. Archrock has entered into a change of control agreement with each of our Named Executive Officers (other than Mr. Guba). Each such agreement provides that if the executive’s employment is terminated by Archrock other than for cause, death or disability, or by the executive for good reason (in each case, a “Qualifying Termination”), within six months before or 18 months following a change of control (as defined in the change of control agreements), he or she would receive a cash payment within 60 days after the termination date equal to:

• two times (three times in the case of Mr. Childers) his or her current annual base salary plus two times (three times in the case of Mr. Childers) his or her target annual incentive bonus opportunity for that year;

• a pro-rated portion of the target annual incentive bonus opportunity for the termination year based on the length of time during which the executive was employed during such year;

• any earned but unpaid annual incentive award for the fiscal year ending prior to the termination date; and

• two times the total of Archrock’s contributions that would have been credited to him or her under the Archrock 401(k) Plan and any other deferred compensation plan had he or she made the required amount of elective deferrals or contributions during the 12 months immediately preceding the termination month.

In addition, the executive would be entitled to:

• any amount previously deferred, or earned but not paid, by him or her under Archrock’s incentive and nonqualified deferred compensation plans or programs as of the termination date;

• continued coverage under Archrock’s medical benefit plans for the executive and his or her eligible dependents for up to two years following the termination date; and

• the accelerated vesting of all his or her Archrock unvested stock options, restricted stock, restricted stock units or other stock-based awards and all Partnership phantom units, unit appreciation rights, unit awards or other unit-based awards and all cash-based incentive awards.

The change of control agreements do not provide for tax gross-ups. Instead, the agreements include a Section 280G “best pay” provision pursuant to which in the event any payments or benefits received by the executive would be subject to an excise tax under Section 4999 of the Code, the executive will receive either the full amount of his or her payments or a reduced amount such that no portion of the payments is subject to the excise tax (whichever results in the greater after-tax benefit to the executive).

Each executive’s entitlement to the payments and benefits under his or her change of control agreement is also subject to his or her execution of a waiver and release for Archrock’s benefit. In addition, in the event an executive receives payments from Archrock under his or her change of control agreement, such executive will be subject to confidentiality, non-disclosure, non-solicitation and non-competition restrictions for two years following a termination of his or her employment.

Vesting of Equity-Based Incentives

Upon a Change of Control. The award agreements for all outstanding equity awards provide that no portion of the award shall be subject to accelerated vesting solely upon a change of control. Instead, such awards will be subject to accelerated vesting only if a termination of the applicable executive’s employment by Archrock without cause or by the executive for good reason occurs within eighteen months following a change of control.

Upon a Termination Due to Death or Disability. The award agreements for all outstanding equity awards provide that, upon a termination due to death or disability, the award will accelerate in full. Performance units will accelerate in full based on (i) the achievement of the applicable performance goals if such goals have been determined as of the date of termination or (ii) achievement at the target performance level if the applicable performance goals have not been determined as of the date of termination.

Payments to Mr. Miller Upon Separation. In connection with Mr. Miller's separation from Archrock on December 1, 2017, he became eligible to receive certain payments and benefits pursuant to his severance benefit agreement, as described above under "Severance Benefit Agreements." These payments and benefits consisted of (i) a lump-sum cash payment equal to $789,475, consisting of the sum of (a) Mr. Miller's annual salary, (b) Mr. Miller's target annual incentive bonus opportunity, (c) a pro-rated target incentive for the year of termination, (d) payment of Archrock’s portion of health and welfare premiums under COBRA for a twelve-month period, plus (e) accrued dividend equivalents for the DCF Performance Units based upon actual performance as determined by the Archrock Compensation Committee, and (ii) accelerated vesting of Mr. Miller's Archrock and Partnership equity awards that would have otherwise vested on the next vesting date immediately following his separation (valued, in the aggregate, at $504,701).

Payments to Mr. Wayne Upon Separation. In order to ensure an effective transition and to continue to obtain the advice and counsel of Mr. Wayne regarding certain pending matters, Archrock entered into a consulting agreement with Mr. Wayne, effective upon his termination on May 10, 2017 and through December 31, 2017. Pursuant to the consulting agreement, Mr. Wayne was paid by Archrock $10,000 per full month for his services as a consultant (for a total of $60,000).

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Potential Payments. The following tables show the potential payments to the Named Executive Officers upon a theoretical termination of employment or change of control (as applicable) occurring on December 31, 2017. The amounts shown assume an Archrock common stock value of $10.50 per share and a Partnership common unit value of $11.91 per unit (the December 29, 2017 market closing prices, respectively). The actual amount paid out to an executive upon an actual termination or change of control can only be determined at the time of such event. Messrs. Wayne and Miller, whose employment terminated on May 10, 2017 and December 1, 2017, respectively, are not included in the tables below; however, the payments and benefits that Mr. Miller received in connection with his termination are described above under “Payments to Mr. Miller Upon Separation” and the payments that Mr. Wayne received in connection with certain post-termination consulting services provided to Archrock are described above under “Payments to Mr. Wayne Upon Separation”.

Potential Payments upon Termination or Change of Control

Name	Termination Due to Death or Disability ($)(1)		Termination Without Cause or Resignation with Good Reason ($)(2)		Change of Control Without a Qualifying Termination ($)	Change of Control with a Qualifying Termination ($)
D. Bradley Childers
Cash Severance	—		2,560,000	(3)	—	5,920,000	(4)
Stock Options	—		—		—	—
Restricted Stock (5)	3,178,544		1,177,196		—	3,178,544
Phantom Units (6)	1,347,748		466,808		—	1,347,748
Performance Awards (7)	2,233,906		1,084,053		—	2,233,906
Other Benefits (8)	—		10,890		—	86,057
Total Pre-Tax Benefit	6,760,198		5,298,947		—	12,766,255
Raymond K. Guba
Cash Severance	—	0	—	(3)	—	—	(4)
Stock Options	—		—		—	—
Restricted Stock (5)	—		—		—	—
Phantom Units (6)	—		—		—	—
Performance Awards (7)	—		—		—	—
Other Benefits (8)	—		—		—	—
Total Pre-Tax Benefit	—		—		—	—
Stephanie C. Hildebrandt
Cash Severance	—		897,000	(3)	—	1,540,500	(4)
Stock Options	—		—		—	—
Restricted Stock (5)	568,964		568,964		—	568,964
Phantom Units (6)	—		—		—	—
Performance Awards (7)	—		—		—	—
Other Benefits (8)	—		5,275		—	25,551
Total Pre-Tax Benefit	568,964		1,471,239		—	2,135,015
Jason G. Ingersoll
Cash Severance	—		690,000	(3)	—	1,185,000	(4)
Stock Options	—		—		—	—
Restricted Stock (5)	378,510		157,306		—	378,510
Phantom Units (6)	127,151		42,384		—	127,151
Performance Awards (7)	202,291		101,222		—	202,291
Other Benefits (8)	—		14,382		—	69,583
Total Pre-Tax Benefit	707,952		1,005,294		—	1,962,535
Robert E. Rice
Cash Severance	—		960,002	(3)	—	1,640,004	(4)
Stock Options	—		—		—	—
Restricted Stock (5)	709,801		315,632		—	709,801
Phantom Units (6)	271,417		93,930		—	271,417
Performance Awards (7)	412,306		158,085		—	412,306
Other Benefits (8)	—		7,198		—	47,462
Total Pre-Tax Benefit	1,393,524		1,534,847		—	3,080,990

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(1) “Disability” is defined in the Partnership’s form of award agreement for phantom units and in the 2013 Stock Incentive Plan for all other equity awards.

(2) “Cause” and “Good Reason” are defined in the severance benefit agreements.

(3) If the executive had been terminated without Cause or resigned with Good Reason on December 31, 2017, under the executive’s severance benefit agreement, his or her cash severance would consist of (i) the sum of base salary and target annual incentive bonus (calculated as a percentage of annual base salary for 2017), plus (ii) the executive’s target annual incentive bonus (calculated as a percentage of annual base salary for 2017).

(4) If the executive had been subject to a Change of Control followed by a Qualifying Termination (as defined in the executive’s change of control agreement) on December 31, 2017, under the executive’s change of control agreement his or her cash severance would consist of (i) two times (three times for Mr. Childers) the sum of base salary and target annual incentive bonus (calculated as a percentage of annual base salary for 2017), plus (ii) the executive’s target annual incentive bonus (calculated as a percentage of his or her annual base salary for 2017).

(5) The amounts in this row represent the value of the accelerated vesting of the executive’s unvested restricted stock of Archrock based on the December 29, 2017 market closing prices of Archrock’s common stock.

(6) The amounts in this row represent the value of the accelerated vesting of the executive’s unvested Partnership phantom units, based on the December 29, 2017 market closing price of the Partnership’s common units.

(7) The amounts in this row represent the value of the accelerated vesting of the executive’s unvested performance awards of Archrock based on the December 29, 2017 market closing price of Archrock’s common stock.

(8) The amounts in this row represent each Named Executive Officer’s right to the payment, as applicable, of (i) in the event of a termination without Cause or voluntary resignation for Good Reason, medical benefit premiums for a one-year period, or (ii) in the event of a Qualifying Termination in connection with a change in control, medical benefit premiums for a two-year period and two times Archrock’s contributions for the preceding 12 months under the 401(k) Plan and deferred compensation plan.

CEO Pay Ratio

As required by Section 953(b) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, and Item 402(u) of Regulation S-K, we are providing the following information regarding the relationship of the annual total compensation of Archrock’s employees and the annual total compensation of Mr. Childers, our Chief Executive Officer. Archrock considers the pay ratio specified below to be a reasonable estimate, calculated in a manner that is intended to be consistent with Item 402(u) of Regulation S-K.

Mr. Childers had an annual total compensation of $5,282,189 for 2017 as reflected in the “Total” column of our Summary Compensation Table included in this Proxy Statement. With respect to the annual total compensation of the median employee, Archrock identified and calculated the elements of such employee’s compensation for 2017 in accordance with the requirements of Item 402(c)(2)(x) of Regulation S-K, resulting in annual total compensation for 2017 of $68,638. As a result, Archrock estimates that Mr. Childers' 2017 annual total compensation was approximately 77 times that of the median of the annual total compensation of all of its employees (other than the CEO).

In determining the median employee, Archrock prepared a listing of all employees (including full-time, part-time, seasonal and temporary employees) as of December 31, 2017 and the total compensation of each such employee for fiscal year 2017. The median employee was selected from this list.

This pay ratio is a reasonable estimate calculated in a manner consistent with SEC rules based on Archrock’s payroll and employment records and the methodology described above. Because the SEC rules for identifying the median compensated employee and calculating the pay ratio based on that employee’s annual total compensation allow companies to adopt a variety of methodologies, to apply certain exclusions, and to make reasonable estimates and assumptions that reflect their compensation practices, the pay ratio reported by other companies may not be comparable to the pay ratio reported above, as other companies may have different employment and compensation practices and may utilize different methodologies, exclusions, estimates and assumptions in calculating their own pay ratios.

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Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Unitholder Matters

~~Securities~~The ~~Authorized~~information called for ~~Issuance~~by ~~Under~~Item ~~Equity~~12 ~~Compensation~~is ~~Plans~~omitted pursuant to General Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly-Owned Subsidiaries).

The following table sets forth information as of December 31, 2017 with respect to the compensation plans under which our common units are authorized for issuance:

Plan Category	(a)Number of Securities to beIssued Upon Exercise ofOutstanding Options,Warrants and Rights(#)	(b)Weighted-AverageExercise Price ofOutstanding Options,Warrants and Rights($)		(c)Number of SecuritiesRemaining Available forFuture Issuance UnderEquity CompensationPlans (ExcludingSecurities Reflected inColumn (a))(#)
Equity compensation plans approved by security holders (1)	153,029	—	(2)	1,923,629
Equity compensation plans not approved by security holders	—	—		—
Total	153,029	—		1,923,629

——————

(1) Includes phantom units granted under the 2006 LTIP, which expired in October 2016, and the 2017 LTIP. For more information about these plans, see Note 9 (“Unit-Based Compensation”) to our Financial Statements.

(2) Phantom units do not have an exercise price.

Security Ownership of Certain Beneficial Owners

The following table sets forth information as of February 15, 2018, with respect to persons known to us to be the beneficial owners of more than five percent of our outstanding common units. Beneficial ownership is determined in accordance with Rule 13d-3 under the Exchange Act.

Name and Address of Beneficial Owner	Common UnitsBeneficially Owned	Percent of CommonUnits BeneficiallyOwned(1)
Harvest Funds Advisors LLC (2)100 West Lancaster Avenue Wayne, PA 19087	5,896,108	8	%
Goldman Sachs Assets Management(3)200 West StreetNew York, NY 10282	4,499,572	6	%
OppenheimerFunds, Inc.(4)Two World Financial Center225 Liberty StreetNew York, NY 10281	8,358,342	12	%
Archrock, Inc.9807 Katy Freeway, Suite 100Houston, TX 77024	29,064,637	41	%

——————

(1) As a percentage of the total limited partner interest. When taking into consideration the 2% general partner interest, the percentages reflected in this column are 8%, 6%, 12% and 43% (including the general partner interest), respectively.

(2) Based solely on a review of the Schedule 13D jointly filed by Harvest Funds Advisors LLC, Harvest Fund Holdco L.P., Blackstone Harvest Holdco L.L.C., Blackstone Intermediary Holdco L.LC., Blackstone Advisory Partners, L.P., Blackstone Advisory Services L.L.C., Blackstone Holdings I L.P., Blackstone Holdings I/II GP Inc., The Blackstone Group L.P., Blackstone Group Management L.L.C. and Stephen A. Schwarzman on October 26, 2017.

(3) Based solely on a review of the Schedule 13G jointly filed by Goldman Sachs Asset Management, L.P. and GS Investment Strategies, LLC (collectively, “Goldman Sachs Asset Management”) on January 30, 2018.

(4) Based solely on a review of the Schedule 13G/A filed by OppenheimerFunds, Inc. on February 6, 2018.

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Security Ownership of Management

The following table sets forth information as of February 15, 2018, with respect to our common units beneficially owned by Archrock GP’s directors, Named Executive Officers and all of our current directors and executive officers as a group. Each beneficial owner has sole voting and investment power with respect to all the units attributed to him.

Name of Beneficial Owner	Units Owned Directly	PhantomUnits(1)	TotalOwnership	Percent ofClass
Named Executive Officers
D. Bradley Childers	80,022	40,733	120,755	*
Raymond K. Guba	—	—	—	*
Stephanie C. Hildebrandt	—	—	—	*
Jason G. Ingersoll	2,828	3,188	6,016	*
Robert E. Rice	17,474	8,119	25,593	*
David S. Miller	26,635	—	26,635	*
Donald C. Wayne	10,969	—	10,969	*
Directors	—
James G. Crump	35,039	—	35,039	*
G. Stephen Finley	37,646	—	37,646	*
Edmund P. Segner, III	29,636	—	29,636	*
All directors, Named Executive Officers and current executive officers as a group (11 persons)	240,249	52,040	292,289	*

——————

* Less than 1%

(1) Only includes phantom units that vest within 60 days of February 15, 2018.

Item 13. Certain Relationships and Related Transactions and Director Independence

~~Transactions~~The ~~with~~information ~~Related~~called ~~Persons~~for by Item 13 is omitted pursuant to General Instruction I(2) to Form 10-K (Omission of Information by Certain Wholly-Owned Subsidiaries).

Distributions and Payments to Our General Partner and its Affiliates

As of December 31, 2017, Archrock and its subsidiaries owned 29,064,637 common units, which constitutes 41% of the limited partner interest in us, and 1,421,768 general partner units, which constitute the entire 2% general partner interest in us. Archrock is, therefore, a “related person” relative to us under SEC regulations, and we believe that Archrock has and will continue to have a direct and indirect material interest in its various transactions with us.

The following summarizes the distributions and payments made or to be made by us to our General Partner and its affiliates in connection with the ongoing operation of Archrock Partners, L.P.

Distributions of available cash to our General Partner and its affiliates		We generally make cash distributions of 98% to our unitholders on a pro rata basis, including our General Partner and its affiliates, as the holders of 29,064,637 common units, and 2% to our General Partner. In addition, if distributions exceed the minimum quarterly distribution and other higher target distribution levels, then our General Partner is entitled to increasing percentages of the distributions, up to 50% of the distributions above the highest target distribution level.
		During the year ended December 31, 2017, our General Partner and its affiliates received aggregate distributions of $1.6 million on their general partner units and $33.1 million on their common units. On February 13, 2018, our General Partner and its affiliates received a quarterly distribution with respect to the period from October 1, 2017 to December 31, 2017, of $0.4 million on their general partner units and $8.3 million on their common units.
Payments to our General Partner and its affiliates		We reimburse Archrock and its affiliates for the payment of all direct and indirect expenses incurred on our behalf. For further information regarding the reimbursement of these expenses, see “— Omnibus Agreement” below.

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Pursuant to the terms of our Omnibus Agreement (as described below), we reimburse Archrock for (1) allocated expenses of operational personnel who perform services for our benefit, (2) direct costs incurred in operating and maintaining our business and (3) allocated SG&A expenses. Our General Partner does not receive any compensation for managing our business. Our General Partner and its affiliates are reimbursed for all expenses incurred on our behalf, including the compensation of Archrock employees who perform services on our behalf. These expenses include all expenses necessary or appropriate to provide for the conduct of our business and that are allocable to us. Our Partnership Agreement provides that our General Partner will determine in good faith the expenses that are allocable to us.

Omnibus Agreement with Archrock

We are party to an Omnibus Agreement with Archrock, our General Partner, and others, which is described below. The Omnibus Agreement (other than the indemnification obligations described below under “— Indemnification for Environmental and Related Liabilities”) will terminate upon a change of control of our General Partner or the removal or withdrawal of our General Partner, and certain provisions will terminate upon a change of control of Archrock.

Non-competition

Archrock also has agreed that new customers for contract compression services are for our account unless the new customer is unwilling to contract with us under our form of compression services agreement. In that case, Archrock may provide compression services to the new customer. If we or Archrock enter into a compression services contract with a new customer, either we or Archrock, as applicable, will receive the protection of the applicable non-competition arrangements described above in the same manner as if such new customer had been a compression services customer of either us or Archrock on the date of the Omnibus Agreement.

The non-competition arrangements described above do not apply to:

• our provision of contract compression services to a particular Archrock customer or customers, with the approval of Archrock;

• Archrock’s provision of contract compression services to a particular customer or customers of ours, with the approval of the conflicts committee of our board of directors;

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• Archrock’s ownership of us;

Indemnification for Environmental and Other Liabilities

Additionally, Archrock will indemnify us for losses attributable to title defects, retained assets and income taxes attributable to pre-closing operations. We will indemnify Archrock for all losses attributable to the post-closing operations of the assets contributed to us, to the extent not subject to Archrock indemnification obligations. For the year ended December 31, 2017, there were no requests for indemnification by either party.

Transfer, Exchange or Lease of Compression Equipment with Archrock

If Archrock determines in good faith that we or Archrock’s contract operations services business need to transfer, exchange or lease compression equipment between Archrock and us, the Omnibus Agreement permits such equipment to be transferred, exchanged or leased if it will not cause us to breach any existing contracts, suffer a loss of revenue under an existing compression services contract or incur any unreimbursed costs. In consideration for such transfer, exchange or lease of compression equipment, the transferee will either (i) transfer to the transferor compression equipment equal in value to the appraised value of the compression equipment transferred to it, (ii) agree to lease such compression equipment from the transferor or (iii) pay the transferor an amount in cash equal to the appraised value of the compression equipment transferred to it. These provisions will terminate on December 31, 2018 unless terminated earlier as discussed above.

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During the year ended December 31, 2017, we transferred ownership of 249 compressor units, totaling approximately 156,600 horsepower with a net book value of $78.9 million, to Archrock. In exchange, Archrock transferred ownership of 251 compressor units, totaling approximately 145,000 horsepower with a net book value of $74.9 million, to us. During the year ended December 31, 2017, we recorded capital distributions of $4.0 million related to the differences in net book value on the exchanged compression equipment. No customer contracts were included in the transfers.

At December 31, 2017, we had equipment on lease to Archrock with an aggregate cost and accumulated depreciation of $3.6 million and $0.3 million, respectively. During the year ended December 31, 2017, we had revenue of $0.7 million from Archrock related to the lease of our compression equipment and cost of sales of $1.0 million with Archrock related to the lease of Archrock compression equipment.

Reimbursement of Operating and SG&A Expense

Archrock provides all operational staff, corporate staff and support services reasonably necessary to run our business. These services may include, without limitation, operations, marketing, maintenance and repair, periodic overhauls of compression equipment, inventory management, legal, accounting, treasury, insurance administration and claims processing, risk management, health, safety and environmental, information technology, human resources, credit, payroll, internal audit, taxes, facilities management, investor relations, enterprise resource planning system, training, executive, sales, business development and engineering.

Archrock charges us for costs that are directly attributable to us. Costs that are indirectly attributable to us and Archrock’s other operations are allocated among Archrock’s other operations and us. The allocation methodologies vary based on the nature of the charge and have included, among other things, headcount and horsepower. We believe that the allocation methodologies used to allocate indirect costs to us are reasonable. Included in our cost of sales during the year ended December 31, 2017 was $17.3 million of indirect costs incurred by Archrock. Included in our SG&A expense during the year ended December 31, 2017 was $68.7 million of indirect costs incurred by Archrock.

Indemnification of Directors and Officers

Under our Partnership Agreement, in most circumstances, we will indemnify the following persons, to the fullest extent permitted by law, from and against all losses, claims, damages or similar events:

• our General Partner;

• any departing general partner;

• any person who is or was an affiliate of a general partner or any departing general partner;

• any person who is or was a director, officer, member, partner, fiduciary or trustee of any entity set forth in the preceding three bullet points;

• any person who is or was serving as director, officer, member, partner, fiduciary or trustee of another person at the request of our General Partner or any departing general partner; and

• any person designated by our General Partner.

Any indemnification under these provisions will only be made out of our assets. Unless it otherwise agrees, our General Partner will not be personally liable for, or have any obligation to contribute or lend funds or assets to us to enable us to effectuate, indemnification. We may purchase insurance against liabilities asserted against and expenses incurred by persons for our activities, regardless of whether we would have the power to indemnify the person against liabilities under our Partnership Agreement.

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Review, Approval or Ratification of Transactions with Related Persons

Our Code of Business Conduct requires all employees, officers and directors of our General Partner, its subsidiaries and affiliates, including Archrock Partners and Archrock (collectively, the “Archrock Group”), to avoid situations involving a “conflict of interest.” A conflict of interest occurs when an individual’s private interest interferes or appears to interfere with the interests of the Archrock Group. A conflict of interest can arise when a person takes actions or has interests that make it difficult to perform his or her work objectively and effectively. Any current or potential conflict of interest must be disclosed to our chief compliance officer. Employment with or service to Archrock as an employee, officer or director, and any compensation or benefits received from such employment or service, or any individual’s ownership interest in Archrock do not constitute conflicts of interest under our Code of Business Conduct.

Our Code of Business Conduct provides that directors and executive officers (and, to the extent not executive officers, our principal financial officer and principal accounting officer) must obtain authorization from the audit committee for any conflict of interest. When deciding whether to authorize such a transaction, the audit committee may consider, among other things, the nature of the transaction and the relationship, the dollar amount involved and the availability of reasonable alternatives.

Our board of directors has established a conflicts committee to carry out certain duties set forth in our Partnership Agreement and the Omnibus Agreement, and to carry out any other duties delegated by the board of directors that involve or relate to conflicts of interests between us and Archrock, including its operating subsidiaries. The related party transactions in which we engaged in 2017 were typically of a recurring, ordinary course nature with Archrock. The conflicts committee reviews on a quarterly basis these recurring, ordinary course transactions with Archrock.

The conflicts committee is charged with acting on an informed basis, in good faith and with an honest belief that any action it takes is in our best interests. In taking any such action, including the resolution of any conflict of interest, the conflicts committee is authorized to consider any factors it determines in its sole discretion to be relevant, reasonable or appropriate under the circumstances.

Director Independence

See Part III, Item 10 (“Directors, Executive Officers and Corporate Governance — Board of Directors”) of this 2017 Form 10-K for a discussion of director independence matters.

Item 14. Principal Accountant Fees and Services

During the years ended December 31, ~~2017~~2018 and ~~2016~~2017, fees for professional services rendered by our independent registered public accounting firm, Deloitte & Touche LLP, were billed to Archrock and then charged to us. The services rendered during the years ended December 31, ~~2017~~2018 and ~~2016~~2017 were for the audit of our annual financial statements and work related to registration statements and ~~cost~~totaled ~~approximately~~ $0.8 million ~~and~~for each year. During the year ended December 31, 2018, we incurred $0.97 million, ~~respectively~~in “Audit Fees” and $0.1 ~~All~~million ofin “Audit-Related Fees” as such terms are defined by the ~~fees~~SEC. ~~during~~All ~~each~~fees ofincurred during the ~~years~~year ended December 31, 2017 ~~and 2016~~ were “Audit Fees,.” ~~and~~No ~~none~~fees ofincurred ~~those~~in ~~fees~~2018 ~~constituted~~or ~~“Audit-Related~~2017 ~~Fees,”~~constituted “Tax Fees” or “All Other Fees” as such terms are defined by the SEC.

In considering the nature of the services provided by Deloitte & Touche LLP, our audit committee determined that such services are compatible with the provision of independent audit services. The audit committee discussed these services with the independent auditor and our management to determine that they are permitted under the rules and regulations concerning auditor independence promulgated by the SEC to implement the Sarbanes-Oxley Act of 2002, as well as the American Institute of Certified Public Accountants.

All services performed by the independent registered public accounting firm during ~~2017~~2018 and ~~2016~~2017 were approved in advance by our audit committee. Any requests for audit, audit-related, tax and other services to be performed by Deloitte & Touche LLP must be submitted to our audit committee for pre-approval. Normally, pre-approval is provided at regularly scheduled meetings. However, the authority to grant pre-approval between meetings, as necessary, has been delegated to the audit committee chair, or, in the absence or unavailability of the chair, one of the other members. Any such pre-approval must be reviewed at the next regularly scheduled audit committee meeting.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) Documents filed as a part of this ~~2017~~2018 Form 10-K

1. Financial Statements. The following financial statements are filed as a part of this ~~2017~~2018 Form 10-K.:

Report of Independent Registered Public Accounting Firm	F-1
Consolidated Balance Sheets	F-2
Consolidated Statements of Operations	F-3
Consolidated Statements of Comprehensive Income	F-4
Consolidated Statements of Comprehensive Income (Loss)	F-4
Consolidated Statements of Partners’ Capital	F-5
Consolidated Statements of Cash Flows	F-6
Notes to Consolidated Financial Statements	F-78


2.	Financial Statement Schedule



Schedule II — Valuation and Qualifying Accounts	S-1

All other schedules have been omitted as they are not required under the relevant instructions.

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3.	Exhibits

Exhibit No.		Description
2.1		~~Purchase~~Agreement and ~~Sale~~Plan ~~Agreement~~of Merger, dated ~~February~~as 27of January 1, ~~2014~~2018, ~~between~~by ~~EXLP~~and ~~Operating~~among Archrock, Inc., Archrock GP LLC, ~~and~~Archrock ~~MidCon~~General ~~Compression~~Partner, L.P. and Archrock Partners, L.CP., incorporated by reference to Exhibit 2.1 toof ~~the~~Archrock ~~Registrant~~Partners’s Current Report on Form 8-K filed on ~~March~~January 52, ~~2014~~2018
2.2		~~Closing~~Amendment ~~Agreement~~No. ~~and~~1 ~~First Amendment~~ to ~~Purchase~~Agreement and ~~Sale~~Plan ~~Agreement~~of Merger, dated ~~April~~as 10of January 11, ~~2014~~2018, ~~between~~by ~~EXLP~~and ~~Operating~~among Archrock, Inc., Archrock GP LLC, ~~and~~Archrock ~~MidCon~~General ~~Compression~~Partner, L.P., Archrock Partners, L.CP. and Amethyst Merger Sub LLC, incorporated by reference to Exhibit 2.12 toof ~~the~~Archrock ~~Registrant~~Partners’s Current Report on Form 8-K filed on ~~April~~January 1516, ~~2014~~2018
2.3		Second Amendment to Purchase and Sale Agreement, dated April 22, 2014, between EXLP Operating LLC and MidCon Compression, L.L.C., incorporated by reference to Exhibit 2.4 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014
3.1		Composite Certificate of Limited Partnership of Archrock Partners, L.P., incorporated by reference to Exhibit 3.4 to the Registrant’s Annual Report on Form 10-K for the year ended on December 31, 2015
2.4		Purchase and Sale Agreement, dated July 11, 2014, between EXLP Operating LLC and MidCon Compression, L.L.C., incorporated by reference to Exhibit 2.1 to the Registrant’s Current Report on Form 8-K filed on July 14, 2014
3.2		First Amended and Restated Agreement of Limited Partnership of Exterran Partners, L.P. (now Archrock Partners, L.P.), as amended, incorporated by reference to Exhibit 3.3 to the Registrant’s Quarterly Report on form 10-Q for the quarter ended March 31, 2008
2.5		Agreement and Plan of Merger, dated as of January 1, 2018, by and among Archrock, Inc., Archrock GP LLC, Archrock General Partner, L.P. and Archrock Partners, L.P., incorporated by reference to Exhibit 2.1 of Archrock Partners’ Current Report on Form 8-K filed on January 2, 2018
3.3		Amendment No. 2 to the First Amended and Restated Agreement of Limited Partnership of Archrock Partners, L.P., dated December 22, 2017, incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on December 22, 2017
2.6		Amendment No. 1 to Agreement and Plan of Merger, dated as of January 11, 2018, by and among Archrock, Inc., Archrock GP LLC, Archrock General Partner, L.P., Archrock Partners, L.P. and Amethyst Merger Sub LLC, incorporated by reference to Exhibit 2.2 of Archrock Partners’ Current Report on Form 8-K filed on January 16, 2018
3.4		Certificate of Limited Partnership of UCO General Partner, LP (now Archrock General Partner, L.P.), incorporated by reference to Exhibit 3.3 to the Registrant’s Registration Statement on Form S-1 filed on June 27, 2006
3.1		Certificate of Limited Partnership of Universal Compression Partners, L.P. (now Archrock Partners, L.P.), incorporated by reference to Exhibit 3.1 to the Registrant’s Registration Statement on Form S-1 filed on June 27, 2006
3.5		Amended and Restated Limited Partnership Agreement of UCO General Partner, LP (now Archrock General Partner, L.P.), incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed on October 26, 2006
3.2		Certificate of Amendment to Certificate of Limited Partnership of Universal Compression Partners, L.P. (now Archrock Partners, L.P.), dated as of August 20, 2007, incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on August 24, 2007
3.6		Certificate of Formation of UCO GP, LLC (now Archrock GP LLC), incorporated by reference to Exhibit 3.5 to the Registrant’s Registration Statement on Form S-1 filed June 27, 2006
3.3		Certificate of Amendment of Certificate of Limited Partnership of Exterran Partners, L.P. (now Archrock Partners, L.P.), incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on November 5, 2015
3.7		Amended and Restated Limited Liability Company Agreement of UCO GP, LLC (now Archrock GP LLC), incorporated by reference to Exhibit 3.3 to the Registrant’s Current Report on Form 8-K filed on October 26, 2006
3.4		Composite Certificate of Limited Partnership of Archrock Partners, L.P., incorporated by reference to Exhibit 3.4 to the Registrant’s Annual Report on Form 10-K for the year ended on December 31, 2015
3.5		First Amended and Restated Agreement of Limited Partnership of Exterran Partners, L.P. (now Archrock Partners, L.P.), as amended, incorporated by reference to Exhibit 3.3 to the Registrant’s Quarterly Report on form 10-Q for the quarter ended March 31, 2008
3.6		Certificate of Limited Partnership of UCO General Partner, LP (now Archrock General Partner, L.P.), incorporated by reference to Exhibit 3.3 to the Registrant’s Registration Statement on Form S-1 filed on June 27, 2006
3.7		Amended and Restated Limited Partnership Agreement of UCO General Partner, LP (now Archrock General Partner, L.P.), incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K filed on October 26, 2006
3.8		Certificate of Formation of UCO GP, LLC (now Archrock GP LLC), incorporated by reference to Exhibit 3.5 to the Registrant’s Registration Statement on Form S-1 filed June 27, 2006
3.9		Amended and Restated Limited Liability Company Agreement of UCO GP, LLC (now Archrock GP LLC), incorporated by reference to Exhibit 3.3 to the Registrant’s Current Report on Form 8-K filed on October 26, 2006
3.10		Amendment No. 2 to the First Amended and Restated Agreement of Limited Partnership of Archrock Partners, L.P., dated December 22, 2017, incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K filed on December 22, 2017
4.1		Indenture, dated as of March 27, 2013, by and among Exterran Partners, L.P., EXLP Finance Corp., the Guarantors named therein and Wells Fargo Bank, National Association, incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed on March 28, 2013
4.2		Registration Rights Agreement, dated as of March 27, 2013, by and among Exterran Partners, L.P., EXLP Finance Corp., the Guarantors named therein and Wells Fargo Securities, LLC, as representative of the Initial Purchasers, incorporated by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K filed on March 28, 2013
4.3		Indenture, dated as of April 7, 2014, by and among Exterran Partners, L.P., EXLP Finance Corp., the Guarantors named therein and Wells Fargo Bank, National Association, incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed on April 11, 2014

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4.3		Indenture, dated as of April 7, 2014, by and among Exterran Partners, L.P., EXLP Finance Corp., the Guarantors named therein and Wells Fargo Bank, National Association, incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8-K filed on April 11, 2014
4.4		Registration Rights Agreement, dated as of April 7, 2014, by and among Exterran Partners, L.P., EXLP Finance Corp., the Guarantors named therein and Wells Fargo Securities, LLC, as representative of the Initial Purchasers, incorporated by reference to Exhibit 4.2 to the Registrant’s Current Report on Form 8-K filed on April 7, 2014
10.1		Fourth Amended and Restated Omnibus Agreement, dated November 3, 2015, by and among Archrock, Inc., formerly named Exterran Holdings, Inc., Archrock Services, L.P., formerly named Exterran US Services OpCo, L.P., Archrock GP LLC, formerly named Exterran GP LLC, Archrock General Partner, L.P., formerly named Exterran General Partner, L.P., Archrock Partners, L.P., formerly named Exterran Partners, L.P., and Archrock Partners Operating LLC, incorporated by reference to Exhibit 10.8 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2015 (portions of this exhibit have been omitted by redacting a portion of the text (indicated by asterisks in the text) and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment)
10.2		First Amendment to Fourth Amended and Restated Omnibus Agreement, dated November 19, 2016, by and among Archrock, Inc., Archrock Services, L.P., Archrock GP LLC, Archrock General Partner, L.P., Archrock Partners, L.P., and Archrock Partners Operating LLC, incorporated by reference to the Registrant’s Current Report on Form 8-K filed on November 23, 2016 (portions of this exhibit have been omitted by redacting a portion of the text (indicated by asterisks in the text) and filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment)
10.3		Amended and Restated Senior Secured Credit Agreement, dated as of November 3, 2010, by and among EXLP Operating LLC, as Borrower, Exterran Partners, L.P., as Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, Bank of America, N.A. and JPMorgan Chase Bank, N.A., as Co-Syndication Agents, Barclays Bank plc and The Royal Bank of Scotland plc, as Co-Documentation Agents, and the lenders signatory thereto, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on November 9, 2010
10.4		Amended and Restated Guaranty Agreement, dated as of November 3, 2010, made by Exterran Partners, L.P. and EXLP Leasing LLC in favor of Wells Fargo Bank, National Association, as Administrative Agent, incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on November 9, 2010
10.5		Amended and Restated Collateral Agreement, dated as of November 3, 2010, made by EXLP Operating LLC, Exterran Partners, L.P. and EXLP Leasing LLC in favor of Wells Fargo Bank, National Association, as Administrative Agent, incorporated by reference to Exhibit 10.3 to the Registrant’s Current Report on Form 8-K filed on November 9, 2010
10.6		First Amendment to Amended and Restated Senior Secured Credit Agreement, dated March 7, 2012, among EXLP Operating LLC, as Borrower, Exterran Partners, L.P., as Guarantor, Wells Fargo Bank, National Association, as Administrative Agent and Swingline Lender, and the other lenders signatory thereto, incorporated by reference to Exhibit 10.1 of the Registrant’s Current Report on Form 8-K filed on March 13, 2012
10.7		Third Amendment to Amended and Restated Senior Secured Credit Agreement, dated March 27, 2013, among EXLP Operating LLC, as Borrower, Exterran Partners, L.P., as Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders signatory thereto, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on March 28, 2013
10.8		Fourth Amendment to Amended and Restated Senior Secured Credit Agreement, dated February 4, 2015, among EXLP Operating LLC, as Borrower, Exterran Partners, L.P., as Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders signatory thereto, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on February 5, 2015
10.9		Fifth Amendment to Amended and Restated Senior Secured Credit Agreement and First Amendment to Amended and Restated Collateral Agreement, dated May 2, 2016, among Archrock Partners Operating LLC, as Borrower, Archrock Partners, L.P., as Guarantor, Wells Fargo Bank, National Association, as Administrative Agent, and the other lenders party thereto, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on May 6, 2016
10.10		Second Amendment to Amended and Restated Collateral Agreement, dated June 17, 2016, among Archrock Partners Operating LLC, as Borrower, Archrock Partners, L.P., the other grantors party thereto, the lenders party thereto and Wells Fargo Bank, National Association, as Administrative Agent, incorporated by reference to Exhibit 10.2 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2016
10.11†		Universal Compression Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.2 to Amendment No. 3 to the Registrant’s Registration Statement on Form S-1 filed October 4, 2006
10.12†		First Amendment to Exterran Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed February 29, 2008
10.13†		Second Amendment to Exterran Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed October 30, 2008
10.14†		Third Amendment to Exterran Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.15 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008

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10.14†		Third Amendment to Exterran Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.15 to the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2008
10.15†		Fourth Amendment to the Exterran Partners, L.P. (now Archrock Partners, L.P.) Long-Term Incentive Plan, incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on November 5, 2015
10.16†		Form of Exterran Partners, L.P. (now Archrock Partners, L.P.) Award Notice and Agreement for Phantom Units with DERs, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on March 10, 2014
10.17†		Form of Exterran Partners, L.P. (now Archrock Partners, L.P.) First Amendment to Award Notice and Agreement for Phantom Units with DERs, incorporated by reference to Exhibit 10.4 to the Registrant’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2014
10.18		Supply Agreement, dated November 3, 2015, by and among Archrock Services, L.P., EXLP Operating LLC, and Exterran Energy Solutions, L.P., incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on November 5, 2015
10.19		Credit Agreement, dated as of March 30, 2017, among Archrock Partners Operating LLC, as Borrower, the other Loan Parties party thereto, the Lenders party thereto, and JPMorgan Chase Bank, N.A., as Administrative Agent for the Lenders, as an Issuing Bank and as Swingline Lender, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on April 5, 2017
10.20		Pledge and Security Agreement, dated as of March 30, 2017, among Archrock Partners Operating LLC and the other Grantors party thereto in favor or JPMorgan Chase Bank, N.A., as Administrative Agent, incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on April 5, 2017
10.21†		Archrock Partners, L.P. 2017 Long-Term Incentive Plan, incorporated by reference to Exhibit A to the Partnership’s Definitive Proxy Statement filed March 20, 2017
10.22†		Form of Archrock Partners, L.P. Award Notice and Agreement for Unit Award with DERs for Non-Employee Directors, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on May 2, 2017
10.23†		Form of Archrock Partners, L.P. Award Notice and Agreement for Phantom Units with DERs, incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K filed on May 2, 2017
10.24		Amendment No.1 to Credit Agreement, dated as of February 23, 2018, by and among Archrock Partners L.P., the other Loan Parties thereto, the Lenders thereto, and JPMorgan Chase Bank, N.A., as the Administrative Agent, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on February 28, 2018
10.25†		Form of Letter Agreement, dated as of March 19, 2018, incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K filed on March 21, 2018
21.1*		List of Subsidiaries of Archrock Partners, L.P.
23.1*		Consent of Deloitte & Touche LLP
31.1*		Certification of the Principal Executive Officer of Archrock GP LLC (as general partner of the general partner of Archrock Partners, L.P.) pursuant to Rule 13a-14 under the Securities Exchange Act of 1934
31.2*		Certification of the Principal Financial Officer of Archrock GP LLC (as general partner of the general partner of Archrock Partners, L.P.) pursuant to Rule 13a-14 under the Securities Exchange Act of 1934
32.1**		Certification of the Chief Executive Officer of Archrock GP LLC (as general partner of the general partner of Archrock Partners, L.P.) pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2**		Certification of the Chief Financial Officer of Archrock GP LLC (as general partner of the general partner of Archrock Partners, L.P.) pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.1*		Interactive data files pursuant to Rule 405 of Regulation S-T

† Management contract or compensatory plan or arrangement.

* Filed herewith.

** Furnished, not filed.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this ~~Annual~~report ~~Report on Form 10-K~~ to be signed on its behalf by the undersigned, thereunto duly authorized.

	ARCHROCK PARTNERS, L.P.
	Archrock Partners, L.P.
	By:	ARCHROCK GENERAL PARTNER, L.P.
		its General Partner
	By:	ARCHROCK GP LLC
		its General Partner
	By:	/s/ D. BRADLEY CHILDERS
		D. Bradley Childers
		Chief Executive Officer
	February 22, 2018
		February 20, 2019

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POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints D. Bradley Childers, ~~Raymond~~Douglas KS. ~~Guba~~Aron and Stephanie C. Hildebrandt, and each of them, his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution for him and in his name, place and stead, in any and all capacities, to sign any and all amendments to this Annual Report on Form 10-K, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission granting unto said attorneys-in-fact and agents full power and authority to do and perform each and every act and thing requisite and necessary to be done as fully to all said attorneys-in-fact and agents, or any of them, may lawfully do or cause to be done by virtue thereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this Annual Report on Form 10-K has been signed below by the following persons on behalf of the registrant and in the capacities indicated on February 2220, ~~2018~~2019.

Signature Title /s/ D. BRADLEY CHILDERS President, and Chief Executive Officer ~~and Chairman of the Board~~, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. (Principal Executive Officer) D. Bradley Childers /s/ ~~RAYMOND~~DOUGLAS KS. ~~GUBA~~ARON ~~Interim~~Senior Vice President and Chief Financial Officer, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. (Principal Financial Officer) ~~Raymond~~Douglas ~~Guba~~S. Aron /s/ DONNA A. HENDERSON Vice President and Chief Accounting Officer, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. (Principal Accounting Officer) Donna A. Henderson /s/ JAMES G. CRUMP Director, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. James G. Crump /s/ G. STEPHEN FINLEY Director, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. G. Stephen Finley /s/ STEPHANIE C. HILDEBRANDT Senior Vice President, General Counsel and Secretary of Archrock GP, LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. Stephanie ~~Hildebrandt /s/ ROBERT E~~C. RICE Senior Vice President and Director, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. (Principal Operating Officer) Robert E. Rice /s/ EDMUND P. SEGNER III Director, Archrock GP LLC, as General Partner of Archrock General Partner, L.P., as General Partner of Archrock Partners, L.P. Edmund P. Segner, IIIHildebrandt

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Partners of Archrock Partners, L.P.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Archrock Partners, L.P. and subsidiaries (the “Partnership”) as of December 31, ~~2017~~2018 and ~~2016~~2017, the related consolidated statements of operations, comprehensive income (loss), partners’ capital, and cash flows for each of the three years in the period ended December 31, ~~2017~~2018, and the related notes and the schedule listed in the Index at Item 15 (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Partnership as of December 31, ~~2017~~2018 and ~~2016~~2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, ~~2017~~2018, in conformity with accounting principles generally accepted in the United States of America.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Partnership’s internal control over financial reporting as of December 31, ~~2017~~2018, based on criteria established in Internal Control -— Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 2220, ~~2018~~2019, expressed an unqualified opinion on the Partnership’s internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on the Partnership’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Change in Accounting Principle

As discussed in Note 2 to the consolidated financial statements, on January 1, 2018, the Partnership changed the manner in which it accounts for revenue from contracts with customers due to the adoption of the new revenue standard. The Company adopted the new standard using the modified retrospective method.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

February 2220, ~~2018~~2019

We have served as the Partnership’s auditor since 2007.

F-1

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ARCHROCK PARTNERS, L.P.

CONSOLIDATED BALANCE SHEETS

(Inin thousands, except unit amounts)

	December 31,
	2017			2016
	2018			2017
ASSETS
Current assets:
Cash	$	~~8,078~~264		$	~~217~~8,078
Accounts receivable, trade, net of allowance of $1,296 and $1,398, respectively	67,714			69,974
Accounts receivable, trade, net of allowance of $1,253 and $1,296, respectively	80,606			67,714
Current portion of interest rate swaps	186			—
Tax refund receivable	14,000			—
Total current assets	75,978			70,191
Derivative asset - current	3,185			186
Property, plant and equipment	2,727,401			2,655,780
Accrued interest on loan receivable due from Archrock	123			—
Accumulated depreciation	(953,325		)	(903,556		)
Total current assets	98,178			75,978
Property, plant and equipment, net	1,774,076			1,752,224
Property, plant and equipment	2,933,568			2,727,401
Intangible assets, net	60,747			76,663
Accumulated depreciation	(1,042,182		)	(953,325		)
Other long-term assets	19,401			4,296
Property, plant and equipment, net	1,891,386			1,774,076
Total assets	$	1,930,202		$	1,903,374
Intangible assets, net	45,839			60,747
Contract costs	32,220			—
Loan receivable due from Archrock	20,000			—
Other long-term assets	17,801			19,401
Total assets	$	2,105,424		$	1,930,202
LIABILITIES AND PARTNERS’ CAPITAL
Current liabilities:
Accounts payable, trade	$	1810,~~368~~646		$	218,~~948~~368
Accrued liabilities	810,~~896~~129			47,~~452~~597
Accrued interest	12,972			12,337
Deferred revenue	9,577			1,299
Due to affiliates, net	4,683			8,012
Accrued interest	11,999			12,972
Current portion of interest rate swaps	134			3,226
Due to Archrock, net	17,251			4,683
Total current liabilities	45,053			30,975
Derivative liability - current	—			134
Long-term debt	1,361,053			1,342,724
Total current liabilities	59,602			45,053
Deferred income taxes	—			2,500
Long-term debt	1,529,501			1,361,053
Other long-term liabilities	9,~~356~~175			59,~~002~~356
Total liabilities	1,~~415~~598,~~462~~278			1,~~381~~415,~~201~~462
Commitments and Contingencies (Note 15)
Commitments and contingencies (Note 17)
Partners’ capital:
Common units, 70,310,590 and 65,606,655 issued, respectively	501,023			516,208
Common units: 70,231,036 and 70,310,590 issued, respectively	488,209			501,023
General partner units, 2% interest with 1,421,768 and 1,326,965 equivalent units issued and outstanding, respectively	11,582			12,027
General partner units: 1,422,458 and 1,421,768 issued and outstanding, respectively	11,630			11,582
Accumulated other comprehensive income (loss)	4,476			(4,170		)
Accumulated other comprehensive income	7,307			4,476
Treasury units, 113,609 and 86,795 common units, respectively	(2,341		)	(1,892		)
Treasury units: 113,609 common units at December 31, 2017	—			(2,341		)
Total partners’ capital	~~514~~507,~~740~~146			~~522~~514,~~173~~740
Total liabilities and partners’ capital	$	12,~~930~~105,~~202~~424		$	1,~~903~~930,~~374~~202

The accompanying notes are an integral part of these consolidated financial statements.

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ARCHROCK PARTNERS, L.P.

CONSOLIDATED STATEMENTS OF OPERATIONS

(Inin thousands~~, except per unit amounts~~)

	Year Ended December 31,
	2017			2016			2015
	2018			2017			2016
Revenue	$	~~557~~612,~~503~~358		$	~~562~~557,~~360~~503		$	~~656~~562,~~808~~360
Costs and expenses:
Cost of sales (excluding depreciation and amortization)	244,576			229,355			209,411
Cost of sales (excluding depreciation and amortization) — affiliates	229,355			209,411			258,492
Selling, general and administrative	70,030			82,035			79,717
Selling, general and administrative — affiliates	82,035			79,717			85,586
Depreciation and amortization	136,757			143,848			153,741
Depreciation and amortization	143,848			153,741			155,786
Long-lived asset impairment	13,727			19,106			46,258
Long-lived asset impairment	19,106			46,258			38,987
Restructuring charges	—			—			7,309
Restructuring charges	—			7,309			—
Interest expense, net	90,313			84,291			77,863
Goodwill impairment	—			—			127,757
Debt extinguishment loss	—			291			—
Interest expense	84,291			77,863			74,581
Merger-related costs	2,718			1			—
Debt extinguishment costs	291			—			—
Other income, net	(3,521		)	(4,385		)	(2,594		)
Other income, net	(4,384		)	(2,594		)	(1,391		)
Income (loss) before income taxes	57,758			2,961			(9,345		)
Total costs and expenses	554,542			571,705			739,798
Provision for income taxes	475			3,382			1,412
Income (loss) before income taxes	2,961			(9,345		)	(82,990		)
Net income (loss)	$	57,283		$	(421	)	$	(10,757	)
Provision for income taxes	3,382			1,412			1,035
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)
General partner interest in net loss	$	(9	)	$	(213	)	$	15,832
Common unitholder interest in net loss	$	(412	)	$	(10,544	)	$	(99,857	)
Loss per common unit:
Basic and diluted	$	(0.01	)	$	(0.18	)	$	(1.71	)
Weighted average common units outstanding used in loss per common unit:
Basic and diluted	67,237			60,450			58,539
Distributions declared and paid per common unit	$	1.1400		$	1.4275		$	2.2600

The accompanying notes are an integral part of these consolidated financial statements.

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ARCHROCK PARTNERS, L.P.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Inin thousands)

	Year Ended December 31,
	2017			2016			2015
	2018			2017			2016
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)
Net income (loss)	$	57,283		$	(421	)	$	(10,757	)
Other comprehensive income (loss):
Other comprehensive income:
Interest rate swap gain (loss), net of reclassifications to earnings	8,207			1,388			(4,705		)
Interest rate swap gain, net of reclassifications to earnings	2,604			8,207			1,388
Amortization of terminated interest rate swaps	~~439~~227			—439			~~2,585~~—
Total other comprehensive income (loss)	8,646			1,388			(2,120		)
Total other comprehensive income	2,831			8,646			1,388
Comprehensive income (loss)	$	860,~~225~~114		$	(98,~~369~~225	)	$	(869,~~145~~369	)

The accompanying notes are an integral part of these consolidated financial statements.

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ARCHROCK PARTNERS, L.P.

CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL

(Inin thousands, except for unit amounts)

															AccumulatedOther Comprehensive Income (loss)
	Partners’ Capital									Treasury Units					AccumulatedOther Comprehensive Income (Loss)
	Partners’ Capital									Treasury Units
	Common Units					General Partner Units
	$			Units		$			Units	$			Units					Total
Balance, January 1, 2015	$	668,714		55,724,022		$	19,542		1,129,221	$	(1,477	)	(61,665	)	$	(3,438	)	$	683,341
Balance at January 1, 2016	$	538,197		59,796,514		$	17,151		1,209,562	$	(1,794	)	(74,888	)	$	(5,558	)	$	547,996
Issuance of common units for vesting of phantom units				5970,~~580~~560														—
Treasury units purchased										(317		)	(13,223	)				(317		)
Acquisition of a portion of Archrock's contract operations business	107,710			3,963,138		2,198			80,341									109,908
Issuance of common units	1,164			49,774														1,164
Contribution (distribution) of capital, net	2,040					(422		)										1,618
Excess of purchase price of equipment over Archrock's cost of equipment	(11,996		)			(646		)										(12,642		)
Cash distributions	(130,637		)			(19,353		)										(149,990		)
Unit-based compensation expense	1,059																	1,059
Comprehensive income (loss)	(99,857		)			15,832									(2,120		)	(86,145		)
Balance, December 31, 2015	$	538,197		59,796,514		$	17,151		1,209,562	$	(1,794	)	(74,888	)	$	(5,558	)	$	547,996
Issuance of common units for vesting of phantom units				70,560														—
Treasury units purchased										(98		)	(11,907	)				(98		)
March 2016 Acquisition	1,799			257,000		37			5,205									1,836
Acquisition of a portion of Archrock's contract operations business	66,364			5,482,581		1,344			111,040									67,708
Issuance of general partner units						8			1,158									8
Contribution (distribution) of capital, net	4,924					184												5,108
Contribution of capital, net	4,924					184												5,108
Cash distributions	(85,736		)			(6,484		)										(92,220		)
Cash distributions ($1.4275 per common unit)	(85,736		)			(6,484		)										(92,220		)
Unit-based compensation expense	1,204																	1,204
Comprehensive income (loss)	(10,544		)			(213		)							1,388			(9,369		)
Comprehensive loss
Balance, December 31, 2016	$	516,208		65,606,655		$	12,027		1,326,965	$	(1,892	)	(86,795	)	$	(4,170	)	$	522,173
Net loss	(10,544		)			(213		)										(10,757		)
Issuance of common units for vesting of phantom units				103,935														—
Interest rate swap gain, net of reclassifications to earnings															1,388			1,388
Balance at December 31, 2016	$	516,208		65,606,655		$	12,027		1,326,965	$	(1,892	)	(86,795	)	$	(4,170	)	$	522,173
Issuance of common units for vesting of phantom units				103,935
Treasury units purchased										(449		)	(26,814	)				(449		)
Issuance of common units	60,291			4,600,000														60,291
Issuance of general partner units						1,307			94,803									1,307
Contribution (distribution) of capital, net	1,456					(176		)										1,280
Cash distributions	(77,582		)			(1,567		)										(79,149		)
Cash distributions ($1.1400 per common unit)	(77,582		)			(1,567		)										(79,149		)
Unit-based compensation expense	1,062																	1,062
Comprehensive income (loss)	(412		)			(9		)							8,646			8,225
Comprehensive income
Balance, December 31, 2017	$	501,023		70,310,590		$	11,582		1,421,768	$	(2,341	)	(113,609	)	$	4,476		$	514,740
Net loss	(412		)			(9		)										(421		)
Interest rate swap gain, net of reclassifications to earnings															8,207			8,207
Amortization of terminated interest rate swaps															439			439
Balance at December 31, 2017	$	501,023		70,310,590		$	11,582		1,421,768	$	(2,341	)	(113,609	)	$	4,476		$	514,740
Issuance of common units for vesting of phantom units				53,091
Treasury units purchased										(250		)	(19,036	)				(250		)
Issuance of general partner units						9			690									9
Contribution of capital, net	4,162					54												4,216
Distribution of capital - excess of fair market value of equipment purchased from Archrock over equipment sold to Archrock	(13,951		)															(13,951		)
Cash distributions ($0.9924 per common unit)	(69,731		)			(1,412		)										(71,143		)
Unit-based compensation expense	314																	314
Impact of adoption of Revenue Recognition Update	12,462					252												12,714
Impact of adoption of ASU 2017-12	375					8												383
Merger-related adjustments	(2,591		)	(132,645	)					2,591			132,645					—
Comprehensive income
Net income	56,146					1,137												57,283
Interest rate swap gain, net of reclassifications to earnings															2,604			2,604
Amortization of terminated interest rate swaps															227			227
Balance at December 31, 2018	$	488,209		70,231,036		$	11,630		1,422,458	$	—		—		$	7,307		$	507,146

The accompanying notes are an integral part of these consolidated financial statements.

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ARCHROCK PARTNERS, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2017			2016			2015
	2018			2017			2016
Cash flows from operating activities:
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)
Net income (loss)	$	57,283		$	(421	)	$	(10,757	)
Adjustments to reconcile net loss to cash provided by operating activities:
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	~~143~~136,~~848~~757			~~153~~143,~~741~~848			~~155~~153,~~786~~741
Long-lived asset impairment	1913,~~106~~727			4619,~~258~~106			3846,~~987~~258
Goodwill impairment	—			—			127,757
Amortization of deferred financing costs	5,881			5,624			4,492
Amortization of deferred financing costs	5,624			4,492			3,770
Amortization of debt discount	1,410			1,325			1,245
Amortization of debt discount	1,325			1,245			1,170
Amortization of terminated interest rate swaps	227			439			—
Amortization of terminated interest rate swaps	439			—			2,585
Debt extinguishment loss	—			291			—
Debt extinguishment costs	291			—			—
Interest rate swaps	(131		)	2,183			1,590
Interest rate swaps	2,183			1,590			603
Unit-based compensation expense	314			1,062			1,203
Unit-based compensation expense	1,062			1,203			1,059
Provision for doubtful accounts	1,105			4,104			2,672
Provision for doubtful accounts	4,104			2,672			2,255
Gain on sale of property, plant and equipment	(3,200		)	(4,262		)	(3,585		)
Gain on sale of property, plant and equipment	(4,262		)	(3,585		)	(1,747		)
Loss on non-cash consideration in March 2016 Acquisition	—			—			635
Loss on non-cash consideration in March 2016 Acquisition	—			635			—
Deferred income tax provision (benefit)	(29		)	3,384			1,444
Deferred income tax provision (benefit)	3,384			1,444			(160		)
Amortization of contract costs	11,709			—			—
Deferred revenue recognized in earnings	(13,672		)	—			—
Changes in assets and liabilities, net of acquisitions:
Accounts receivable, trade	(120,~~667~~371		)	12(1,~~537~~919		)	(712,~~986~~537		)
Other assets and liabilities	4,317			1,554			1,112
Contract costs	(27,612		)	—			—
Net cash provided by operating activities	179,333			213,029			241,166
Other assets and liabilities	2,335			4,263			554
Deferred revenue	17,973			54			1,000
Net cash provided by operating activities	183,706			179,081			213,029
Cash flows from investing activities:
Capital expenditures	(~~179~~287,~~319~~349		)	(62179,~~345~~319		)	(~~229~~62,~~202~~345		)
Proceeds from sale of property, plant and equipment	3126,~~010~~291			2831,~~858~~010			1328,~~593~~858
Payment for March 2016 Acquisition	—			(13,779		)	—
Proceeds from insurance	252			252			—
Decrease in amounts due from affiliates, net	—			—			2,322
Payment for March 2016 Acquisition	—			—			(13,779		)
Net cash used in investing activities	(148,309		)	(47,266		)	(213,287		)
(Borrowings to) repayments from Archrock, net	(20,000		)	—			—
Net cash used in investing activities	(280,806		)	(148,057		)	(47,266		)
Cash flows from financing activities:
Proceeds from borrowings of long-term debt	~~919~~603,~~000~~830			~~257~~919,~~500~~000			~~430~~257,500
Repayments of long-term debt	(~~904~~438,~~194~~636		)	(~~328~~904,~~500~~194		)	(~~310~~328,~~000~~500		)
Payments for debt issuance costs	(143,~~855~~332		)	(114,~~719~~855		)	(1,~~311~~719		)
Payments for settlement of interest rate swaps that include financing elements	(1,785		)	(3,058		)	(3,728		)
(Payments for) proceeds from settlement of interest rate swaps that include financing elements	190			(1,785		)	(3,058		)
Distributions to unitholders	(7971,~~149~~143		)	(9279,~~220~~149		)	(~~149~~92,~~990~~220		)
Net proceeds from issuance of common units	~~60,291~~—			—60,291			~~1,164~~—
Net proceeds from sale of general partner units	1,307			45			—
Net proceeds from issuance of general partner units	9			1,307			45
Purchases of treasury units	(~~449~~250		)	(98449		)	(~~317~~98		)
Increase (decrease) in amounts due to affiliates, net	(3,329		)	2,032			5,980
Increase (decrease) in amounts due to Archrock, net	(1,382		)	(3,329		)	2,032
Net cash used in financing activities	(23,163		)	(166,018		)	(27,702		)
Net cash provided by (used in) financing activities	89,286			(23,163		)	(166,018		)
Net increase (decrease) in cash	(7,~~861~~814		)	~~(255~~7,861		)	~~177~~(255		)
Cash at beginning of period	~~217~~8,078			~~472~~217			~~295~~472
Cash at end of period	$	~~8,078~~264		$	~~217~~8,078		$	~~472~~217
Supplemental disclosure of cash flow information:
Cash paid for interest	$	7685,~~002~~677		$	7376,~~738~~002		$	6973,~~280~~738
Income taxes paid (refunded), net	(141		)	(71		)	1,124
Income taxes refunded, net	(469		)	(141		)	(71		)
Supplemental disclosure of non-cash transactions:
Accrued capital expenditures	$	1810,~~368~~646		$	218,~~934~~368		$	2,~~110~~934
Non-cash capital contribution from limited and general partner	52,~~247~~720			15,~~163~~247			91,~~977~~163
Contract operations equipment acquired/exchanged, net	(3,967		)	70,310			99,560
Non-cash capital distribution to Archrock	(13,951		)	—			—
Non-cash consideration in March 2016 Acquisition	—			3,165			—
Contract operations equipment acquired/exchanged, net	1,496			(3,967		)	70,310
Common units issued in March 2016 Acquisition	—			1,799			—
Intangible assets allocated in contract operations acquisitions	—			1,147			1,055
Non-cash capital contribution (distribution) due to contract operations acquisitions	—			(17,292		)	7,608
Common units issued in contract operations acquisitions	—			85,112			100,267
General partner units issued in contract operations acquisitions	—			1,687			2,033

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Non-cash consideration in March 2016 Acquisition	—	—	3,165
Common units issued in March 2016 Acquisition	—	—	1,799
Intangible assets allocated in contract operations acquisitions	—	—	1,147
Non-cash capital distribution due to contract operations acquisitions	—	—	(17,292	)
Common units issued in contract operations acquisitions	—	—	85,112
General partner units issued in contract operations acquisitions	—	—	1,687

The accompanying notes are an integral part of these consolidated financial statements.

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ARCHROCK PARTNERS, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. Organization and Summary of Significant Accounting Policies

Organization

We are a ~~publicly-held~~ Delaware limited partnership formed in June 2006. toOn ~~provide~~April ~~natural~~26, ~~gas~~2018, ~~contract~~Archrock ~~operations~~completed ~~services~~the toacquisition ~~customers~~of ~~throughout~~all of our outstanding common units that it did not already own and, as a result, we became its wholly-owned subsidiary. See Note 10 (“Partners’ Capital”) for further details of the UMerger.S.

InWe ~~November~~are ~~2015,~~a ~~Exterran~~leading ~~Holdings,~~provider ~~Inc.~~of ~~completed~~natural ~~the~~gas ~~Spin-off~~compression ~~through~~services ~~the~~to ~~distribution~~customers ofin ~~all of~~ the ~~outstanding~~oil ~~shares~~and ofnatural ~~common~~gas ~~stock~~industry ofthroughout ~~Exterran~~the ~~Corporation~~U.S. ~~Upon~~Our ~~the~~business ~~completion~~supports ofa ~~the Spin~~must-~~off,~~run ~~Exterran~~service ~~Holdings,~~that ~~Inc.~~is ~~was~~essential ~~renamed~~to ~~“Archrock, Inc.” and~~ the ~~ticker~~production, ~~symbol~~processing, ~~for~~transportation ~~Archrock’s~~and ~~common~~storage ~~stock~~of onnatural ~~the~~gas. ~~New~~Our ~~York~~geographic ~~Stock~~diversity ~~Exchange~~and ~~was~~large ~~changed~~fleet toof ~~“AROC.”~~natural ~~Also~~gas ~~effective~~compression inequipment ~~November~~enable ~~2015,~~us weto ~~were~~provide ~~renamed~~reliable ~~“Archrock~~contract ~~Partners,~~operations ~~L.P.”~~services ~~and~~to ~~the ticker symbol for~~ our ~~common~~customers ~~units~~throughout on the ~~Nasdaq Global Select Market was changed to “APLP~~U.”S.

~~Our~~We ~~General~~operate ~~Partner~~in isone ansegment ~~indirect~~solely ~~wholly-owned~~within ~~subsidiary of Archrock. Our General Partner is a limited partnership, its general partner, Archrock GP, conducts our business and operations and~~ the ~~board of directors and officers of Archrock GP, which we refer to herein as our board of directors and our officers, make decisions on our behalf~~U.S.

AsSignificant ofAccounting December 31, 2017, public unitholders held a 57% ownership interest in us and Archrock owned our remaining equity interests, including the general partner interests and all of the incentive distribution rights.Policies

~~Proposed~~Principles ~~Merger~~of Consolidation and Use of Estimates

See Note 17 (“Proposed Merger”) for details of the Proposed Merger.

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Nature of Operations

We consider and report all of our operations as one segment and operate solely within the U.S.

Principles of Consolidation

The accompanying consolidated financial statements include us and our subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Certain prior year amounts have been reclassified to conform to the current year presentation.

~~Use~~The preparation of ~~Estimates~~financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the ~~Financial~~reported ~~Statements~~amount of assets, liabilities, revenues, expenses and disclosures of contingent assets and liabilities. Because of the inherent uncertainties in this process, actual future results could differ from those expected as of the reporting date. Management believes that the estimates and assumptions used are reasonable.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amount of assets, liabilities, revenues, expenses and disclosures of contingent assets and liabilities. Because of the inherent uncertainties in this process, actual future results could differ from those expected at the reporting date. Management believes that the estimates and assumptions used are reasonable.

Revenue Recognition

~~Contract~~As ~~operations~~a result of the Revenue Recognition Update adopted January 1, 2018, revenue is recognized when ~~earned,~~control ~~which~~of ~~generally~~the ~~occurs~~promised ~~monthly~~goods ~~when~~or ~~service~~services is ~~provided~~transferred ~~under~~to our customers, in an amount that reflects the consideration we are entitled to receive in exchange for those goods or services. Sales and usage-based taxes that are collected from the customer ~~contracts~~are excluded from revenue.

In our contract operations business, natural gas compression service revenue is recognized over time and revenue associated with billable maintenance on our natural gas compression equipment is recognized at a point in time. The timing of revenue recognition is impacted by contractual provisions for service availability guarantees of our compressor assets and re-billable costs associated with moving our compressor assets to a customer site. Under previous guidance, contract operations revenue was recognized when earned, which generally occurs monthly when the service is provided under our customer contracts.

Concentrations of Credit Risk

Financial instruments that potentially subject us to concentrations of credit risk consist of trade accounts receivable. Trade accounts receivable are due from companies of varying size engaged principally in oil and natural gas activities throughout the U.S. We review the financial condition of customers prior to extending credit and generally do not obtain collateral for trade receivables. Payment terms are on a short-term basis and in accordance with industry practice. We consider this credit risk to be limited due to these companies’ financial resources, the nature of services we provide and the terms of our contract operations customer service agreements.

During the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, Williams Partners accounted for approximately 1614%, 1716% and 1617% of our revenue, respectively. Additionally, during ~~each of~~ the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, Anadarko accounted for 9%, 10% and 10%, respectively, of our revenue. No other single customer accounted for ~~more than~~ 10% or more of our revenue during these years. As of December 31, ~~2017~~2018, trade receivables outstanding from ~~Williams~~Anadarko ~~Partners~~ and ~~Anadarko~~Williams Partners were 2220% and 1316%, respectively, of our total trade accounts receivable balance. As of December 31, ~~2016~~2017, trade receivables outstanding from ~~Williams~~Anadarko ~~Partners~~ and ~~Anadarko~~Williams Partners were 2013% and 1522%, respectively, of our total trade accounts receivable balance.

Property, Plant and Equipment

Property, plant and equipment includes compression equipment that is recorded at cost and depreciated using the straight-line method over their estimated useful lives. For compression equipment, depreciation begins with the first compression service. The estimated useful life for compression equipment is 15 to 30 years. Repairs and maintenance are expensed as incurred. Major improvements that extend the useful life of compressor units are capitalized and depreciated over the estimated useful life, up to 7 years. When property, plant and equipment is sold, retired or otherwise disposed of, the gain or loss is recorded in other (income) loss, net.

Depreciation expense during the years ended December 31, 2017, 2016 and 2015 was $127.9 million, $138.0 million and $141.2 million, respectively.

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Property, Plant and Equipment

Property, plant and equipment includes compression equipment that is recorded at cost and depreciated using the straight-line method over their estimated useful lives. For compression equipment, depreciation begins with the first compression service. The estimated useful life for compression equipment is 15 to 30 years. Major improvements that extend the useful life of a compressor unit are capitalized and depreciated over the estimated useful life of the major improvement, up to seven years. Repairs and maintenance are expensed as incurred. When property, plant and equipment is sold, retired or otherwise disposed of, the gain or loss is recorded in other (income) loss, net.

Depreciation expense during the years ended December 31, 2018, 2017 and 2016 was $121.9 million, $127.9 million and $138.0 million, respectively.

Long-Lived Assets

We review long-lived assets, including property, plant and equipment and identifiable intangibles that are being amortized, for impairment whenever events or changes in circumstances, including the removal of compressor units from our active fleet, indicate that the carrying amount of an asset may not be recoverable. An impairment loss exists when estimated undiscounted cash flows expected ~~to result~~ from the use of the asset and its eventual disposition are less than its carrying amount. ~~When~~Impairment ~~necessary,~~losses anare ~~impairment~~recognized ~~loss~~in isthe ~~recognized~~period in which the impairment occurs and ~~represents~~represent the excess of the asset’s carrying value asover ~~compared to~~ its ~~estimated~~ fair value ~~and is charged to the period in which the impairment occurred~~. Identifiable intangibles are amortized over the ~~assets’~~ estimated useful ~~lives~~life of the asset.

Goodwill

Goodwill acquired in connection with business combinations represent the excess of consideration over the fair value of tangible and identifiable intangible net assets acquired. Certain assumptions and estimates were employed in determining the fair value of assets acquired and liabilities assumed.

We reviewed the carrying value of our goodwill for potential impairment in the fourth quarter of every year, or whenever events or other circumstances indicated that we may not be able to recover the carrying amount. We first assessed qualitative factors to evaluate whether it was more likely than not that the fair value of a reporting unit was less than its carrying amount as the basis for determining whether it was necessary to perform the two-step goodwill impairment test.

If a two-step goodwill impairment test is elected or required, the first step is to compare the implied fair value of our reporting unit with its carrying value (including the goodwill). If the implied fair value of the reporting unit is higher than the carrying value, no impairment is deemed to exist and no further testing was required. If the implied fair value of the reporting unit is below the recorded carrying value, then a second step must be performed to determine the goodwill impairment required, if any. We calculate the implied fair value of the reporting unit goodwill by allocating the estimated fair value of the reporting unit to all of the assets and liabilities of the reporting unit as if the reporting unit had been acquired in a business combination. If the carrying value of the reporting unit’s goodwill exceeds the implied fair value of the goodwill, we recognize an impairment loss for that excess amount.

In the fourth quarter of 2015, energy markets experienced an accelerated decline in oil and natural gas prices which impacted our future cash flow forecasts, our market capitalization and the market capitalization of peer companies. We identified these conditions as a triggering event and performed a two-step goodwill impairment test as of December 31, 2015, which resulted in a full impairment of our remaining goodwill of $127.8 million.

Due To/From Affiliates, Net

We have receivables and payables with Archrock. A valid right of offset exists related to the receivables and payables with our affiliates and as a result, we present such amounts on a net basis in our consolidated balance sheets.

The transactions reflected in due to/from affiliates, net, primarily consist of centralized cash management activities between us and Archrock. Because these balances are treated as short-term borrowings between us and Archrock, serve as a financing and cash management tool to meet our short-term operating needs, are large, turn over quickly and are payable on demand, we present borrowings and repayments with our affiliates on a net basis within the consolidated statements of cash flows. Net receivables from our affiliates are considered advances and changes are presented as investing activities in the consolidated statements of cash flows. Net payables due to our affiliates are considered borrowings and changes are presented as financing activities in the consolidated statements of cash flows.

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Income Taxes

As a partnership, all income, gains, losses, expenses, deductions and tax credits we generate generally flow through to our unitholders. However, some states impose an entity-level income tax on partnerships, including us. We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events included in the financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial statements and the tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax ~~rates~~rate on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.

We record uncertain tax positions in accordance with the accounting standard on income taxes under a two-step process whereby (1) we determine whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is greater than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

~~Comprehensive Income (Loss)~~F-9

Components of comprehensive income (loss) are net income (loss) and all changes in equity during a period except those resulting from transactions with our limited partners or General Partner. Our accumulated other comprehensive income (loss) consists only of derivative instruments. Changes in accumulated other comprehensive income (loss) represent changes in the fair value of derivative instruments that are designated as cash flow hedges to the extent the hedge is effective and amortization of terminated interest rate swaps. See Note 10 (“Derivatives”) for additional disclosures related to comprehensive income (loss).

Hedging and Use of Derivative Instruments

We use derivative instruments to minimize the risks and costs associated with financial activities by managing our exposure to interest rate fluctuations on a portion of our debt obligations. We do not use derivative instruments for trading or other speculative purposes. We record interest rate swaps on the balance sheet as either derivative assets or derivative liabilities measured at their fair value. The fair value of our derivatives is based on the income approach (discounted cash flow) using market observable inputs, including forward LIBOR curves. Changes in the fair value of the swaps designated as cash flow hedges are deferred in accumulated other comprehensive income (loss) to the extent the contracts are effective as hedges until settlement of the underlying hedged transaction. To qualify for hedge accounting treatment, we must formally document, designate and assess the effectiveness of the transactions. If the necessary correlation ceases to exist or if the anticipated transaction is no longer probable, we would discontinue hedge accounting and apply mark-to-market accounting. Amounts paid or received from interest rate swap agreements are charged or credited to interest expense and matched with the cash flows and interest expense of the debt being hedged, resulting in an adjustment to the effective interest rate.

Income (Loss) Per Common Unit

Income (loss) per common unit is computed using the two-class method. Under the two-class method, basic income (loss) per common unit is determined by dividing net income (loss) allocated to the common units after deducting the amounts allocated to our General Partner (including distributions to our General Partner on its incentive distribution rights) and participating securities, by the weighted average number of outstanding common units excluding the weighted average number of outstanding participating securities during the period. Participating securities include unvested phantom units with nonforfeitable tandem distribution equivalent rights to receive cash distributions in the quarter in which distributions are paid on common units. During periods of net loss, no effect is given to participating securities because they do not have a contractual obligation to participate in our losses.

When computing income (loss) per common unit in periods when distributions are greater than income (loss), the amount of the actual incentive distribution rights, if any, is deducted from net income (loss) and allocated to our General Partner for the corresponding period. The remaining amount of net income (loss), after deducting distributions to participating securities, is allocated between the general partner and common units based on how our Partnership Agreement allocates net losses.

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~~When~~Hedging ~~computing income per common unit in periods when income is greater than distributions, income is allocated to the General Partner, participating securities~~ and ~~common~~Use ~~units based on how our Partnership Agreement would allocate income if the full amount~~ of ~~income~~Derivative for the period had been distributed. This allocation of net income does not impact our total net income, consolidated results of operations or total cash distributions (including actual incentive distribution rights); however, it may result in our General Partner being allocated additional incentive distributions for purposes of our income per unit calculation, which could reduce net income per common unit. However, as required by our Partnership Agreement, we determine cash distributions based on available cash and determine the actual incentive distributions allocable to our General Partner based on actual distributions.Instruments

~~The~~We ~~following~~use ~~table~~derivative ~~reconciles~~instruments ~~net~~to ~~loss~~manage ~~used~~our exposure to fluctuations in the ~~calculation~~variable interest rate of ~~basic~~the Credit Facility and ~~diluted~~thereby ~~loss~~minimize ~~per~~the ~~common~~risks ~~unit~~and costs associated with financial activities. We do not use derivative instruments for trading or other speculative purposes. We record interest rate swaps on the balance sheet as either derivative assets or derivative liabilities measured at their fair value. The fair value of our derivatives is based on the income approach (discounted cash flow) using market observable inputs, including LIBOR forward curves. Changes in ~~thousands~~the fair value of the derivatives designated as cash flow hedges are recognized as a component of other comprehensive income (loss): until the hedged transaction affects earnings. At that time, amounts are reclassified into earnings to interest expense, the same statement of operations line item to which the earnings effect of the hedged item is recorded. To qualify for hedge accounting treatment, we must formally document, designate and assess the effectiveness of the transactions. If the necessary correlation ceases to exist or if the anticipated transaction is no longer probable, we would discontinue hedge accounting and apply mark-to-market accounting. Amounts paid or received from interest rate swap agreements are charged or credited to interest expense and matched with the cash flows and interest expense of the debt being hedged, resulting in an adjustment to the effective interest rate.

	Year Ended December 31,
	2017			2016			2015
Net loss	$	(421	)	$	(10,757	)	$	(84,025	)
Less: General partner incentive distribution rights	—			—			(17,853		)
Less: General partner 2% ownership interest	9			213			2,021
Common unitholder interest in net loss	(412		)	(10,544		)	(99,857		)
Less: Net income attributable to participating securities	(203		)	(226		)	(184		)
Net loss used in basic and diluted loss per common unit	$	(615	)	$	(10,770	)	$	(100,041	)

The following table shows the potential common units that were included in computing diluted loss per common unit (in thousands):

	Year Ended December 31,
	2017		2016		2015
Weighted average common units outstanding including participating securities	67,412		60,628		58,610
Less: Weighted average participating securities outstanding	(175	)	(178	)	(71	)
Weighted average common units outstanding — used in basic loss per common unit	67,237		60,450		58,539
Net dilutive potential common units issuable:
Phantom units	—		—		—
Weighted average common units and dilutive potential common units — used in diluted loss per common unit	67,237		60,450		58,539

2. Recent Accounting Developments

Accounting Standards Updates Implemented

On January 1, ~~2017~~2018, we adopted ~~Update~~ASU ~~2016~~2017-0912 ~~which~~using ~~simplifies~~the ~~several~~modified ~~aspects~~retrospective ofapproach ~~the~~to ~~accounting~~existing ~~for~~cash ~~share-based~~flow ~~payment~~hedge ~~transactions~~relationships as of January 1, 2018. ~~Update~~ASU ~~2016~~2017-0912 ~~allows~~expands ~~companies~~and torefines ~~make~~hedge an accounting ~~policy~~for ~~election~~both tofinancial ~~either~~and ~~estimate~~nonfinancial ~~forfeitures~~risk orcomponents, ~~account~~aligns ~~for~~the ~~forfeitures~~recognition asand ~~they~~presentation ~~occur.~~of Wethe ~~have~~effects ~~elected~~of tothe ~~account~~hedging ~~for~~instrument ~~forfeitures~~and ashedged ~~they~~item ~~occur.~~in ~~There~~the ~~was~~financial nostatements ~~material~~and ~~impact~~eliminates the requirement to ~~the~~separately ~~consolidated~~measure ~~financial~~and ~~statements~~report ashedge ineffectiveness. As a result of the adoption of ~~this~~ASU ~~standard~~2017-12, we recognized a net gain of $0.4 million as a cumulative-effect adjustment to opening partners’ capital and a corresponding adjustment to other comprehensive income (loss) to reverse the cumulative ineffectiveness previously recognized in interest expense.

~~Accounting~~On ~~Standards~~January ~~Updates~~1, ~~Not~~2018, ~~Yet~~we ~~Implemented~~adopted ASU 2016-15 on a retrospective basis. ASU 2016-15 addresses diversity in practice and simplifies several elements of cash flow classification including how certain cash receipts and cash payments are classified in the statement of cash flows. As a result of the adoption of ASU 2016-15 we reclassified $0.3 million of insurance proceeds from net cash provided by operating activities to net cash used in investing activities in our consolidated statement of cash flows during the year ended December 31, 2017. There was no impact to our consolidated statement of cash flows during the year ended December 31, 2016.

InRevenue ~~August~~Recognition ~~2017, the FASB issued~~ Update 2017-12 which expands and refines hedge accounting for both nonfinancial and financial risk components, aligns the recognition and presentation of the effects of the hedging instrument and hedged item in the financial statements and makes certain targeted improvements to simplify the application of hedge accounting guidance. Update 2017-12 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Entities will apply Update 2017-12 provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted; amended presentation and disclosure guidance will be required only prospectively. Early adoption is permitted. We are currently evaluating the impact of Update 2017-12 on our consolidated financial statements, including the impact of an early adoption as permitted in the guidance.

On January 1, 2018, we adopted the Revenue Recognition Update using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. We recognized the cumulative effect of initially applying the Revenue Recognition Update as an adjustment to the opening balance of retained earnings. For contracts that were modified before the effective date, we identified performance obligations on the basis of the current version of the contract, which included any contract modifications since inception. The application of the practical expedient for contract modifications did not have a material effect on the adjustment to retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.

Under previous guidance, contract operations revenue was recognized when earned, which generally occurs monthly when the service is provided under our customer contracts. Under the Revenue Recognition Update the timing of revenue recognition is impacted by contractual provisions for service availability guarantees of our compressor assets and re-billable costs associated with moving our compressor assets to a customer site. These changes are further discussed below and did not result in a material difference from previous practice for contract operations.

The Revenue Recognition Update provides guidance on contract costs that should be recognized as assets and amortized over the period that the related goods or services transfer to the customer. Certain costs that were previously expensed as incurred, such as sales commissions and freight charges to transport compressor assets, are deferred and amortized.

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The following table summarizes the cumulative impact of the adoption of the Revenue Recognition Update on the opening balance sheet (in thousands):



	December 31, 2017		Adjustments Due to the Revenue Recognition Update		January 1, 2018
Assets
Contract costs	$	—	$	16,316	$	16,316

Liabilities
Accrued liabilities	$	7,597	$	186	$	7,783
Deferred revenue	1,299		3,416		4,715

Partners’ capital
Common units	$	501,023	$	12,462	$	513,485
General partner units	11,582		252		11,834

The following tables summarize the impact of the application of the Revenue Recognition Update on our consolidated balance sheet and consolidated statements of operations (in thousands):



	December 31, 2018
Balance Sheet	As Reported		Balance Excluding the Impact of the Revenue Recognition Update		Effect of Change
Assets
Accounts receivable, trade	$	80,606	$	80,291	$	315
Contract costs	32,220		—		32,220

Liabilities
Accrued liabilities	$	10,129	$	9,833	$	296
Deferred revenue	9,577		2,002		7,575
Other long-term liabilities	9,175		9,187		(12		)

Equity
Common units	$	488,209	$	464,104	$	24,105
General partner units	11,630		11,059		571

——————


⁽¹⁾	Represents the impact of the Revenue Recognition Update on net income attributable to noncontrolling interest which was reclassed to additional paid-in capital pursuant to the Merger.

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Table of Contents

In August 2016, the FASB issued Update 2016-15 which addresses diversity in practice and simplifies several elements of cash flow classification including how certain cash receipts and cash payments are presented and classified in the statement of cash flows. Update 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Update 2016-15 will require adoption on a retrospective basis unless it is impracticable to apply, in which case it would be required to apply the amendments prospectively as of the earliest date practicable. We have evaluated Update 2016-15 and do not expect a material impact on our consolidated financial statements.



	December 31, 2018
Statement of Operations	As Reported		Balance Excluding the Impact of the Revenue Recognition Update		Effect of Change
Revenue	$	612,358	$	616,311	$	(3,953	)
Cost of sales (excluding depreciation and amortization)	244,576		258,808		(14,232		)
Selling, general and administrative	70,030		71,701		(1,671		)
Provision for income taxes	475		487		(12		)
Net income (loss)	57,283		45,321		11,962

InAccounting ~~June~~Standards ~~2016,~~Updates ~~the~~Not ~~FASB~~Yet issued Update 2016-13 that changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, held-to-maturity debt securities and loans, and requires entities to use a new forward-looking expected loss model that will result in the earlier recognition of allowance for losses. Update 2016-13 is effective for fiscal years beginning after December 15, 2019, and early adoption is permitted. Entities will apply Update 2016-13 provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. We are currently evaluating the impact of Update 2016-13 on our consolidated financial statements.Implemented

In ~~February 2016~~August 2018, the FASB issued ~~Update~~ASU ~~2016~~2018-0213 ~~that~~which ~~establishes~~amends athe ~~right-of-use~~required ~~model~~fair ~~that~~value ~~requires~~measurements adisclosures ~~lessee~~related to ~~record~~valuation atechniques ~~right-of-use asset~~ and ainputs ~~lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating~~used, ~~with~~uncertainty ~~classification affecting the pattern of expense recognition~~ in ~~the income statement. Under the new guidance~~measurement, ~~lessor~~and ~~accounting~~changes isin ~~largely~~measurements ~~unchanged~~applied. ~~Update~~These ~~2016-02~~amendments isare effective for ~~fiscal~~all ~~years~~entities ~~beginning~~for ~~after~~fiscal ~~December 15~~years, ~~2018,~~and ~~including~~ interim periods within those fiscal years~~. A modified retrospective transition approach is required for lessees for capital and operating leases existing at~~, orbeginning ~~entered into~~ after, ~~the~~December ~~beginning of the earliest comparative period presented in the financial statements~~15, ~~with certain practical expedients available~~2019. InEarly ~~November~~adoption ~~2017,~~is the FASB tentatively decided to amend certain aspects of 2016-02 to allow entities the option to elect not to restate comparative periods when transitioning to the new standard and to elect not to separate lease and non-lease components when certain conditions are metpermitted. We are incurrently ~~the~~evaluating ~~initial phase of our assessment which includes identifying potential contracts and transactions subject to~~ the ~~provisions~~impact of ~~the~~ASU ~~standard~~2018-13 ~~such that we can assess the impacts~~ on our consolidated financial statements and footnote disclosures.

~~From~~In ~~May 2014~~June ~~through May~~ 2016, the FASB issued ~~the~~ASU ~~Revenue~~2016-13 ~~Recognition Update~~ that ~~outlines~~changes athe ~~single~~impairment ~~comprehensive~~ model for ~~companies~~most tofinancial ~~use~~assets inand ~~accounting~~certain ~~for~~other ~~revenue~~instruments, ~~arising~~including ~~from~~trade ~~contracts with customers~~ and ~~supersedes~~other ~~the~~receivables, ~~most~~held-to-maturity ~~current~~debt ~~revenue~~securities ~~recognition~~and ~~guidance~~loans, ~~including~~and ~~industry-specific~~requires ~~guidance.~~entities ~~The~~to ~~core~~use ~~principle~~a ofnew ~~the~~forward-looking ~~Revenue~~expected ~~Recognition~~loss ~~Update~~model is that anwill ~~entity~~result ~~should~~in ~~recognize revenue to depict~~ the ~~transfer~~earlier recognition of ~~promised~~allowance ~~goods~~for orlosses. ~~services~~For topublic ~~customers~~entities ~~in an amount~~ that ~~reflects~~meet the ~~consideration~~definition toof ~~which~~an ~~the~~SEC ~~entity~~filer, ~~expects~~ASU to2016-13 beis ~~entitled~~effective ~~in exchange~~ for ~~those~~fiscal ~~goods~~years orbeginning ~~services.~~after ~~The~~December ~~Revenue Recognition Update also requires disclosures enabling users of financial statements to understand the nature~~15, ~~amount,~~2019 ~~timing~~ and ~~uncertainty~~early ofadoption ~~revenue~~is ~~and~~permitted. ~~cash~~Entities ~~flows~~will ~~arising~~apply ~~from~~ASU ~~contracts~~2016-13 ~~with~~provisions ~~customers.~~as ~~The~~a ~~Revenue~~cumulative-effect ~~Recognition~~adjustment ~~Update~~to ~~will~~retained beearnings ~~effective~~as ~~for~~of ~~reporting~~the ~~periods~~ beginning ~~after~~of ~~December 15,~~the ~~2017,~~first ~~including~~reporting ~~interim~~period ~~periods~~in ~~within~~which the ~~reporting~~guidance ~~period~~is adopted. ~~Early~~We ~~adoption~~are iscurrently ~~permitted~~evaluating ~~for~~the ~~reporting~~impact ~~periods~~of ~~beginning~~ASU ~~after December 15,~~ 2016.-13 ~~Companies~~on ~~may~~our ~~use~~consolidated ~~either~~financial astatements ~~full~~and ~~retrospective~~footnote ~~or a modified retrospective approach~~disclosures.

Under current guidance, contract operations revenue is recognized when earned, which generally occurs monthly when the service is provided under our customer service agreements. We anticipate the timing of revenue recognized will be impacted by contractual provisions for availability guarantees for our services and re-billable costs associated with moving compressor equipment to a customer site. We have concluded that these changes will not result in a material difference from current practice.Leases

~~The~~ASC ~~Revenue~~Topic ~~Recognition~~842 ~~Update~~Leases ~~provides~~establishes ~~guidance~~a ROU model that requires a lessee to record a ROU asset and a lease liability on ~~contract~~the ~~costs~~balance ~~that~~sheet. ~~should~~Leases will be ~~recognized~~classified as ~~assets~~either ~~and~~finance ~~amortized~~or ~~over~~operating, with classification affecting the ~~period~~pattern of expense recognition in the income statement. Under the new guidance, lessor accounting is largely unchanged. ASC Topic 842 Leases is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. A modified retrospective transition approach that involves recasting the ~~related~~comparative ~~goods~~periods in the year of initial application is required for leases existing at, or ~~services~~entered ~~transfer~~into after, the beginning of the earliest comparative period presented in the financial statements, with certain transition practical expedients available including an option not to apply the ~~customer~~recognition requirements to short term leases. ~~Certain~~In ~~costs~~July ~~such~~2018 asthe ~~sales~~FASB ~~commissions~~provided ~~and~~an ~~freight~~optional ~~charges~~transition tomethod ~~transport~~that ~~compressor~~would ~~assets,~~allow ~~currently~~adoption ~~expensed~~of the standard as ~~incurred,~~of ~~will~~the beeffective ~~deferred~~date ~~and~~without ~~amortized~~restating prior periods.

WeThe ~~will~~July ~~adopt~~2018 amendment also provided lessors with a practical expedient to not separate nonlease components from the associated lease component and, instead, to account for those components as a single component if the nonlease components otherwise would be accounted for under the Revenue Recognition Update ~~effective~~and ~~January~~certain 1,conditions ~~2018,~~are ~~using~~met. The amendment also provided clarification on whether ASC Topic 842 Leases or the ~~modified~~Revenue ~~retrospective~~Recognition ~~transition~~Update ~~method~~is ~~applied~~applicable to ~~those~~the ~~contracts~~combined ~~which~~component ~~are~~based ~~not~~on ~~complete~~determination as of the predominant component. An entity that ~~date,~~elects ~~which~~the ~~will~~lessor ~~result~~practical inexpedient aalso ~~cumulative-effect~~should ~~adjustment~~provide tocertain ~~decrease~~disclosures. ~~retained~~We ~~deficit~~evaluated bythe animpact ~~amount~~of ~~ranging~~the ~~from~~July ~~$10~~2018 ~~million~~amendment toon ~~$14~~our ~~million~~contract ~~dollars~~operations services agreements and have concluded that the services nonlease component is predominant, ~~net~~which ofresults ~~tax.~~in the ongoing recognition following the Revenue Recognition Update guidance.

WeIn ~~anticipate~~conjunction ~~significant~~with our assessment of ASC Topic 842 Leases we established a cross-functional implementation team to identify our lease population and to assess changes to our ~~disclosures~~internal ~~based~~control onstructure, business processes, systems and accounting policies necessary to implement the ~~requirements~~standard. ~~prescribed~~Based byon our review, we have determined that ASC Topic 842 Leases will not have an impact on our consolidated balance sheet or statement of operations because of the ~~Revenue~~available ~~Recognition~~practical ~~Update~~expedients.

Prior to our adoption of the Revenue Recognition Update effective January 1, 2018, we established a transition team, with representation from all functional areas of our businesses that were expected to be impacted in order to implement the required changes. Processes to capture and verify the quality of information needed, including identifying and implementing changes to our information technology systems, were developed and tested. We are also updating our accounting policies and documenting operational procedures for recognizing revenue under the new guidance.

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Table of Contents

We3. ~~are~~Revenue ~~finalizing~~from ~~changes~~Contracts ~~to our internal control structure and upon adoption plan to implement new controls to address the risks associated~~ with ~~recognizing~~Customers revenue under the new guidance. We have modified certain controls effective in the fourth quarter of 2017 to take into consideration the new criteria for recognizing revenue, specifically identifying promises within the contract that give rise to performance obligations, and evaluating the impact of variable consideration on the transaction price. We will continue to evaluate our business processes, systems and controls to ensure the accuracy and timeliness of the recognition and disclosure requirements under the new revenue guidance.

3.Revenue ~~Business Acquisitions~~Recognition

~~November 2016~~Revenue ~~Contract~~is ~~Operations~~recognized ~~Acquisition~~when control of the promised goods or services is transferred to our customers, in an amount that reflects the consideration we are entitled to receive in exchange for those goods or services. Sales and usage-based taxes that are collected from the customer are excluded from revenue.

InThe ~~November~~following ~~2016,~~table wepresents ~~completed~~our ~~the~~revenue ~~November 2016 Contract Operations Acquisition whereby we acquired~~ from ~~Archrock~~contracts ~~contract operations customer service agreements~~ with 63 customers ~~and~~disaggregated aby ~~fleet~~revenue ofsource ~~262 compressor units used to provide compression services under those agreements, comprising approximately 147,000 horsepower, or approximately 4%~~ (of then-available horsepower) of the combined U.S. contract operations business of Archrock and us. At the acquisition date, the acquired fleet assets had a net book value of $66.6 million, net of accumulated depreciation of $55.6 million. Total consideration for the transaction was $85.0 million, excluding transaction costs. In connection with the acquisition, we issued approximately 5.5 million common units to Archrock and 111,040 general partner units to our General Partner. During the year ended December 31, 2016, we incurred transaction costs of approximately $0.4 million related to this acquisition, which is reflected in ~~other (income~~thousands) ~~loss, net, in our consolidated statement of operations.~~ :

In connection with this acquisition, we were allocated $1.1 million finite life intangible assets associated with customer relationships of Archrock’s contract operations segment. The amounts allocated were based on the ratio of fair value of the net assets transferred to us to the total fair value of Archrock’s contract operations segment. These intangible assets are being amortized through 2024, based on the present value of income expected to be realized from these intangible assets.



	Year Ended December 31, 2018
0 - 1,000 horsepower per unit	$	220,413
1,001 - 1,500 horsepower per unit	253,919
Over 1,500 horsepower per unit	135,322
Other ⁽¹⁾	2,704
Total revenue ⁽²⁾	$	612,358

Because Archrock and we are considered entities under common control, GAAP requires that we record the assets acquired and liabilities assumed from Archrock in connection with the November 2016 Contract Operations Acquisition using Archrock’s historical cost basis in the assets and liabilities. The difference between the historical cost basis of the assets acquired and liabilities assumed and the purchase price is treated as either a capital contribution or distribution. As a result, we recorded a capital distribution of $17.3 million for the November 2016 Contract Operations Acquisition during the year ended December 31, 2016.——————

An(1) ~~acquisition~~Primarily ofrelates a business from an entity under common control is generally accounted for under GAAP by the acquirer with retroactive application as if the acquisition date was the beginning of the earliest period included in the financial statements. Retroactive effect to ~~the~~fees November 2016 Contract Operations Acquisition was impracticable because such retroactive application would have required significant assumptions in a prior period that cannot be substantiated. Accordingly, our financial statements include the assets acquired, liabilities assumed, revenue and direct operating expenses associated with ~~the~~Partnership-owned ~~acquisition~~non-compressor ~~beginning on the date of such acquisition~~equipment. ~~However, the preparation of pro forma financial information allows for certain assumptions that do not meet the standards of financial statements prepared in accordance with GAAP.~~

~~March 2016~~(2) ~~Acquisition~~Includes $5.9 million related to billable maintenance on Partnership-owned units that was recognized at a point in time. All other revenue is recognized over time.

InContract March 2016, we completed the March 2016 Acquisition whereby we acquired contract operations customer service agreements with four customers and a fleet of 19 compressor units used to provide compression services under those agreements comprising approximately 23,000 horsepower. The $18.8 million purchase price was funded with $13.8 million in borrowings under our Former Credit Facility, a non-cash exchange of 24 compressor units for $3.2 million, and the issuance of 257,000 common units for $1.8 million. In connection with this acquisition, we issued and sold 5,205 general partner units to our General Partner so it could maintain its approximate 2% general partner interest in us. During the year ended December 31, 2016, we incurred transaction costs of $0.2 million related to the March 2016 Acquisition, which is reflected in other (income) loss, net, in our consolidated statement of operations.Operations

Natural gas compression services are generally satisfied over time, as the customer simultaneously receives and consumes the benefits provided by these services. Our performance obligation is a series in which the unit of service is one month, as the customer receives substantially the same benefit each month from the services regardless of the type of service activity performed, which may vary. If the transaction price is based on a fixed fee, revenue is recognized monthly on a straight-line basis over the period that we are providing services to the customer. Amounts invoiced to customers for costs associated with moving our compressor assets to a customer site are also included in the transaction price and are amortized over the initial contract term. We have elected the practical expedient to not consider the effects of the time value of money, as the expected time between the transfer of services and payment for such services is less than one year.

Variable consideration exists if customers are billed at a lesser standby rate when a unit is not running. We have elected to apply the invoicing practical expedient to recognize revenue for such variable consideration, as the invoice corresponds directly to the value transferred to the customer based on our performance completed to date. The rate for standby service is lower to reflect the decrease in costs and effort required to provide standby service when a unit is not running.

We also perform billable maintenance service on our natural gas compression equipment at the customer’s request on an as-needed basis. The performance obligation is satisfied and revenue is recognized at the agreed-upon transaction price at the point in time when service is complete and the customer has accepted the work performed and can obtain the remaining benefits of the service that the unit will provide.

As of December 31, 2018, we had $246.0 million of remaining performance obligations related to our contract compression service. This amount will be recognized through 2022 as follows (in thousands):



	2019		2020		2021		2022		Total
Remaining performance obligations	$	174,962	$	56,866	$	12,699	$	1,503	$	246,030

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Table of Contents

WeContract accounted for the March 2016 Acquisition using the acquisition method, which requires, among other things, assets acquired to be recorded at their fair value on the acquisition date. The following table summarizes the purchase price allocation based on estimated fair values of the acquired assets as of the acquisition date (in thousands):Balances

	Fair Value
Property, plant and equipment	$	14,929
Intangible assets	3,839
Purchase price	$	18,768

Contract operations services are generally billed monthly at the beginning of the month in which service is being provided. We recognize a contract asset when we have the right to consideration in exchange for goods or services transferred to a customer when the right is conditioned on something other than the passage of time. We recognize a contract liability when we have an obligation to transfer goods or services to a customer for which we have already received consideration. Freight billings to customers for the transport of compressor assets often result in a contract liability.

~~Property~~As of December 31, ~~Plant~~and January 1, 2018, our receivables from contracts with customers, net of allowance for doubtful accounts were $78.6 million and ~~Equipment~~$66.2 million, respectively. As of December 31, and ~~Intangible~~January 1, ~~Assets~~2018, ~~Acquired~~our contract liabilities were $9.7 million and $5.4 million, respectively, which are included in deferred revenue and other long-term liabilities in our consolidated balance sheets. The increase in the contract liability balance during the year ended December 31, 2018 was due to the deferral of $18.0 million partially offset by $13.7 million recognized as revenue during the period, each primarily related to freight billings.

~~Property,~~4. ~~plant~~Business ~~and equipment is comprised of compressor units that will be depreciated on a straight-line basis over an estimated average remaining useful life of 15 years.~~Acquisitions

~~The~~November 2016 ~~amount~~Contract ofOperations finite life intangible assets, and their associated average useful lives, was determined based on the period which the assets are expected to contribute directly or indirectly to our future cash flows, and consisted of the following:Acquisition

	Amount (in thousands)				Average Useful Life
Contract based	$	3,839			2.3 years

In November 2016, we completed the November 2016 Contract Operations Acquisition whereby we acquired from Archrock contract operations customer service agreements with 63 customers and a fleet of 262 compressor units used to provide compression services under those agreements comprising approximately 147,000 horsepower, or approximately 4% (of then-available horsepower), of the combined U.S. contract operations business of Archrock and us. At the acquisition date, the acquired fleet assets had a net book value of $66.6 million, net of accumulated depreciation of $55.6 million. Total consideration for the transaction was $85.0 million excluding transaction costs. In connection with the acquisition, we issued 5.5 million common units to Archrock and 111,040 general partner units to our General Partner. During the year ended December 31, 2016, we incurred transaction costs of $0.4 million related to this acquisition which is reflected in other income, net in our consolidated statement of operations.

~~The~~In ~~results~~connection with this acquisition, we were allocated $1.1 million finite-life intangible assets associated with customer relationships of Archrock’s contract operations ~~attributable~~segment. toThe amounts allocated were based on the ratio of the fair value of the net assets ~~acquired~~transferred into us to the ~~March 2016~~total ~~Acquisition~~fair ~~have~~value ~~been~~of ~~included~~Archrock’s incontract ~~our~~operations ~~consolidated~~segment. ~~financial~~These ~~statements~~intangible ~~since~~assets are being amortized through 2024 based on the ~~date~~present value of ~~acquisition~~income expected to be realized from these intangible assets.

~~April 2015~~Because we and Archrock are considered entities under common control, GAAP requires that we record the assets acquired and liabilities assumed from Archrock using Archrock’s historical cost basis in the assets and liabilities. The difference between the historical cost basis of the assets acquired and liabilities assumed and the purchase price is treated as either a capital contribution or distribution. As a result, we recorded a capital distribution of $17.3 million for the November 2016 Contract Operations Acquisition during the year ended December 31, 2016.

InAn ~~April~~acquisition ~~2015,~~of wea ~~completed~~business ~~the~~from ~~April 2015~~an ~~Contract~~entity ~~Operations~~under ~~Acquisition~~common ~~whereby~~control weis ~~acquired~~generally ~~from~~accounted ~~Archrock~~for ~~contract~~under ~~operations~~GAAP ~~customer~~by ~~service~~the ~~agreements~~acquirer with ~~60 customers~~retroactive ~~and~~application aas ~~fleet~~if ofthe ~~238~~acquisition ~~compressor~~date ~~units~~was ~~used~~the tobeginning ~~provide compression services under those agreements, comprising approximately 148,000 horsepower, or 3% (~~of ~~then-available horsepower) of~~ the ~~combined~~earliest ~~contract~~period ~~operations~~included ~~business~~in ofthe ~~Archrock~~financial ~~and us~~ statements. ~~The~~Retroactive ~~acquired~~effect ~~assets~~to ~~also~~the ~~included~~November ~~179~~2016 ~~compressor~~Contract ~~units,~~Operations ~~comprising~~Acquisition ~~approximately~~was ~~66,000~~impracticable ~~horsepower,~~because ~~previously~~such ~~leased~~retroactive ~~from~~application ~~Archrock~~would tohave ~~us.~~required Atsignificant ~~the~~assumptions ~~acquisition~~in ~~date, the acquired fleet assets had~~ a ~~net~~prior ~~book~~period ~~value~~that ofcannot ~~$108~~be substantiated.8 ~~million~~Accordingly, ~~net~~our offinancial ~~accumulated~~statements ~~depreciation~~include ~~of 59.9 million. Total consideration for~~ the ~~transaction~~assets ~~was approximately 102.3 million~~acquired, ~~excluding~~liabilities ~~transaction costs. In connection with this acquisition~~assumed, werevenue ~~issued approximately 4.0 million common units to Archrock~~ and ~~80,341~~direct ~~general~~operating ~~partner~~expenses ~~units~~associated towith ~~our~~the ~~General~~acquisition ~~Partner.~~beginning ~~Based~~ on the ~~terms~~date of the ~~contribution,~~acquisition. ~~conveyance and assumption agreement~~However, the ~~common~~preparation ~~units~~of ~~and~~pro ~~general~~forma ~~partner~~financial ~~units,~~information ~~including~~allows ~~incentive distribution rights, we issued~~ for ~~this~~certain ~~acquisition~~assumptions ~~were~~that do not ~~entitled~~meet tothe ~~receive~~standards aof ~~cash~~financial ~~distribution~~statements ~~relating~~prepared toin ~~the~~accordance ~~quarter~~with ~~ended March 31, 2015~~GAAP.

InUnaudited ~~connection~~Pro ~~with~~Forma ~~this~~Financial acquisition, we were allocated $1.1 million finite life intangible assets associated with customer relationships of Archrock’s contract operations segment. The amounts allocated were based on the ratio of fair value of the net assets transferred to us to the total fair value of Archrock’s contract operations segment. These intangible assets are being amortized through 2024, based on the present value of income expected to be realized from these intangible assets.Information

~~Because~~The ~~Archrock~~unaudited ~~and~~pro weforma ~~are~~financial ~~considered~~information ~~entities~~for ~~under~~the ~~common~~year ~~control~~ended December 31, ~~GAAP~~2016 ~~requires~~has ~~that~~been weincluded ~~record~~to give effect to the assets acquired ~~and liabilities assumed from Archrock~~ in ~~connection with~~ the ~~April 2015~~November 2016 Contract Operations Acquisition ~~using Archrock’s historical cost basis in the assets and liabilities~~. The ~~difference~~November ~~between~~2016 ~~the~~Contract ~~historical~~Operations ~~cost~~Acquisition ~~basis~~is ofpresented ~~the~~below ~~assets~~as ~~acquired~~though ~~and~~this ~~liabilities~~transaction ~~assumed~~occurred ~~and the purchase price is treated~~ as ~~either~~of aJanuary ~~capital contribution or distribution. As a result~~1, ~~we recorded a capital contribution of $7~~2015.6 ~~million~~The ~~for~~unaudited ~~the~~pro ~~April 2015~~forma ~~Contract~~financial ~~Operations~~information ~~Acquisition~~reflects ~~during~~ the ~~year ended December 31, 2015.~~following:

An• ~~acquisition~~our ~~of a business from an entity under common control is generally accounted for under GAAP by the acquirer with retroactive application as if the~~ acquisition ~~date was the beginning~~ of ~~the~~certain ~~earliest~~contract ~~period~~operations ~~included~~customer inservice the financial statements. Retroactive effect to the April 2015 Contract Operations Acquisition was impracticable because such retroactive application would have required significant assumptions in a prior period that cannot be substantiated. Accordinglyagreements, ~~our~~compression ~~financial~~equipment ~~statements~~and ~~include~~identifiable ~~the~~intangible assets ~~acquired,~~from ~~liabilities~~Archrock; ~~assumed, revenue~~ and direct operating expenses associated with the acquisition beginning on the date of such acquisition. However, the preparation of pro forma financial information allows for certain assumptions that do not meet the standards of financial statements prepared in accordance with GAAP.


•	our issuance of 5.5 million common units to Archrock and 111,040 general partner units to our General Partner.

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~~Unaudited~~The ~~Pro~~pro ~~Forma~~forma ~~Financial~~financial ~~Information~~information below is presented for informational purposes only and is not necessarily indicative of the results of operations that would have occurred had the transaction been consummated at the beginning of the period presented, nor is it necessarily indicative of future results. The pro forma financial information below was derived by adjusting our historical financial statements.

The following table shows pro forma financial information for the year ended December 31, 2016 (in thousands, except per unit amount):



	Year ended December 31, 2016
Revenue	$	589,494
Net income	552
Basic and diluted income per common unit	—

March 2016 Acquisition

In March 2016, we completed the March 2016 Acquisition whereby we acquired contract operations customer service agreements with four customers and a fleet of 19 compressor units used to provide compression services under those agreements comprising approximately 23,000 horsepower. The $18.8 million purchase price was funded with $13.8 million in borrowings under our Former Credit Facility, a non-cash exchange of 24 compressor units for $3.2 million and the issuance of 257,000 common units for $1.8 million. In connection with this acquisition, we issued and sold 5,205 general partner units to our General Partner in order to maintain its approximate 2% general partner interest in us. During the year ended December 31, 2016, we incurred transaction costs of $0.2 million related to the March 2016 Acquisition which is reflected in other income, net in our consolidated statement of operations.

We accounted for the March 2016 Acquisition using the acquisition method which requires, among other things, assets acquired to be recorded at their fair value on the acquisition date. The following table summarizes the purchase price allocation based on estimated fair values of the acquired assets as of the acquisition date (in thousands):



	Fair Value
Property, plant and equipment	$	14,929
Intangible assets	3,839
Purchase price	$	18,768

The acquired property, plant and equipment primarily consisted of compressor units that will be depreciated on a straight-line basis over an estimated average remaining useful life of 15 years.

The amount of acquired finite-life intangible assets and their average useful lives were determined based on the period over which the assets are expected to contribute directly or indirectly to our future cash flows and consisted of the following (dollars in thousands):



	Amount		Average Useful Life
Contract-based intangible assets	$	3,839	2.3 years

The results of operations attributable to the assets acquired in the March 2016 Acquisition have been included in our consolidated financial statements since the date of acquisition.

Pro forma financial information is not presented for the March 2016 Acquisition as it is immaterial to our reported results.

The unaudited pro forma financial information for the years ended December 31, 2016 and 2015 have been included to give effect to the additional assets acquired in the November 2016 Contract Operations Acquisition and the April 2015 Contract Operations Acquisition. The November 2016 Contract Operations Acquisition is presented in the unaudited pro forma financial information as though this transaction occurred as of January 1, 2015. The April 2015 Contract Operations Acquisition is presented in the unaudited pro forma financial information as though this transaction occurred as of January 1, 2014. The unaudited pro forma financial information reflects the following transactions:

As related to the November 2016 Contract Operations Acquisition:

• our acquisition of certain contract operations customer service agreements, compression equipment and identifiable intangible assets from Archrock; and

• our issuance of approximately 5.5 million common units to Archrock and 111,040 general partner units to our General Partner.

As related to the April 2015 Contract Operations Acquisition:

• our acquisition of certain contract operations customer service agreements, compression equipment and identifiable intangible assets from Archrock; and

• our issuance of approximately 4.0 million common units to Archrock and 80,341 general partner units to our General Partner.

The pro forma financial information below is presented for informational purposes only and is not necessarily indicative of our results of operations that would have occurred had the transaction been consummated at the beginning of the period presented, nor is it necessarily indicative of future results. The pro forma financial information below was derived by adjusting our historical financial statements.

The following table shows pro forma financial information for the years ended December 31, 2016 and 2015 (in thousands, except per unit amounts):

	Year ended December 31,
	2017		2016
Revenue	$	589,494	$	699,687
Net income (loss)	$	552	$	(72,438	)
Basic and diluted income (loss) per common unit	$	—	$	(1.39	)

Pro forma net income (loss) per common unit is determined by dividing the pro forma net income (loss) that would have been allocated to our common unitholders by the weighted average number of common units outstanding after the completion of the transactions included in the pro forma financial information. Pursuant to our Partnership Agreement, to the extent that the quarterly distributions exceed certain targets, our General Partner is entitled to receive certain incentive distributions that will result in more net income proportionately being allocated to our General Partner than to our common unitholders. No pro forma incentive distributions to our General Partner nor a reduction to net income (loss) allocable to our common unitholders was included in our pro forma net income (loss) per common unit calculation for the year ended December 31, 2016, as there were no incentive distributions issued related to the 2016 annual period. The pro forma net income (loss) per common unit calculations include pro forma incentive distributions to our General Partner and a reduction of net income allocable to our common unitholders of $1.9 million for the year ended December 31, 2015 which reflects the amount of additional incentive distributions that would have occurred during this period.

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45. Related Party Transactions

OnRevolving ~~January~~Loan ~~1, 2018, we entered into the Merger~~ Agreement ~~pursuant~~with ~~to which~~ Archrock ~~will acquire all of our outstanding common units not already owned by Archrock. See Note 17 (“Proposed Merger”) for further details.~~

In conjunction with the closing of the Merger on April 26, 2018, we and Archrock entered into the Revolving Loan Agreement under which we may make loans to Archrock from time to time in an aggregate amount not to exceed the Credit Facility’s outstanding balance. The Revolving Loan Agreement matures on the maturity date of our Credit Facility. Interest on amounts loaned under the Revolving Loan Agreement is payable to us on a monthly basis and is calculated as a proportion of our total interest expense on the Credit Facility.

On April 26, 2018, Archrock terminated its credit facility and repaid the $63.2 million in outstanding borrowings and accrued and unpaid interest and fees under the Archrock credit facility with a borrowing under the Revolving Loan Agreement. See Note 9 (“Long-Term Debt”) and Note 10 (“Partners’ Capital”) for further details of our pay down of the Archrock credit facility and the Merger, respectively.

At December 31, 2018, the balance of outstanding borrowings under the Revolving Loan Agreement was $20.0 million. During the year ended December 31, 2018, we recorded $1.8 million of interest income earned on loans to Archrock under the Revolving Loan Agreement which was included in interest expense, net in our consolidated statements of operations.

Omnibus Agreement

Our Omnibus Agreement ~~with~~provides ~~Archrock~~for, ~~our General Partner and others includes,~~ among other things:

• certain agreements not to compete between Archrock and its affiliates, on the one hand, and us and our affiliates, on the other hand;


•	Archrock’s obligation to provide all operational staff, corporate staff and support services reasonably necessary to operate our business and our obligation to reimburse Archrock for such services;

• the terms under which we, Archrock, and our respective affiliates may transfer, exchange or lease compression equipment among one another;

• Archrock’s grant to us of a license to use certain intellectual property, including ~~our~~the “Archrock” logo; and


•	Archrock’s and our obligations to indemnify each other for certain liabilities.

The Omnibus Agreement will terminate upon a change of control of Archrock GP, our General Partner or us, and certain provisions of the Omnibus Agreement will terminate upon a change of control of Archrock.

Non-competition

Under the Omnibus Agreement, subject to the provisions described below, Archrock has agreed not to offer or provide ~~compression~~contract operations services to our contract operations services customers that are not also contract operations services customers of Archrock. Compression services include natural gas contract compression services, but exclude fabrication of compression equipment, sales of compression equipment or material, parts or equipment that are components of compression equipment, leasing of compression equipment without also providing related compression equipment service, gas processing operations services and operation, maintenance, service, repairs or overhauls of compression equipment owned by third parties. Similarly, we have agreed not to offer or provide ~~compression~~such services to Archrock’s contract operations services customers that are not also our contract operations services customers.

Some of our customers are also Archrock’s contract operations services customers, which we refer to as overlapping customers. We and Archrock have agreed, subject to the exceptions described below, not to provide ~~contract~~compression ~~operations~~ services to an overlapping customer at any site at which the other was providing such services to an overlapping customer on the date of the most recent ~~amendment to the~~ Omnibus Agreement, ~~each~~such sites being referred to as a “Partnership ~~site~~Site” or an “Archrock ~~site”~~Site,” ~~as applicable~~respectively. Pursuant to the Omnibus Agreement, if an overlapping customer requests contract operations services at a Partnership ~~site~~Site or an Archrock ~~site~~Site, whether in addition to or in replacement of the contract operations services or equipment existing at such site on the date of the most recent ~~amendment to the~~ Omnibus Agreement, we may provide ~~contract~~those ~~operations~~ services if such overlapping customer is a Partnership ~~overlapping~~ customer, and Archrock will be entitled to provide such ~~contract operations~~ services if such overlapping customer is an Archrock ~~overlapping~~ customer. ~~Additionally~~Otherwise, any ~~additional~~ contract operations services provided to a Partnership ~~overlapping~~ customer will be provided by us and any ~~additional~~such services provided to an Archrock ~~overlapping~~ customer will be provided by Archrock.

Archrock also has agreed that new customers for contract ~~compression~~operations services are for our account unless the new customer is unwilling to contract with us under our form of ~~compression~~contract operations services agreement. In that case, Archrock may provide ~~compression~~ services to the new customer. A customer that is a customer only through the lease-takeover of contracts from an existing customer of either Archrock or ourselves is considered a new customer if it requests additional contract operations services in its own name. If we or Archrock enter into a ~~compression~~contract operations services contract with a new customer, either we or Archrock, as applicable, will receive the protection of the applicable non-competition arrangements described above in the same manner as if such new customer had been a ~~compression~~contract operations services customer of either us or Archrock on the date of the Omnibus Agreement.

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Indemnification for Environmental and Other Liabilities

Under the Omnibus Agreement, Archrock has agreed to indemnify us, for a three-year period following each applicable asset acquisition from Archrock, against certain potential environmental claims, losses and expenses associated with the ownership and operation of the acquired assets that occur before the acquisition date. Archrock’s maximum liability for environmental indemnification obligations under the Omnibus Agreement cannot exceed $5.0 million, and Archrock will not have any obligation under the environmental or any other indemnification until our aggregate losses exceed $250,000. Archrock will have no indemnification obligations with respect to environmental claims made as a result of additions to or modifications of environmental laws promulgated after such acquisition date. We have agreed to indemnify Archrock against environmental liabilities occurring on or after the applicable acquisition date related to our assets to the extent Archrock is not required to indemnify us.

Additionally, Archrock will indemnify us for losses attributable to title defects, retained assets and income taxes attributable to pre-closing operations. We will indemnify Archrock for all losses attributable to the post-closing operations of the assets contributed to us, to the extent not subject to Archrock indemnification obligations. For the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, there were no requests for indemnification by either party.

Common Control Transactions

Transactions between us and Archrock and its affiliates are transactions between entities under common control. Under GAAP, transfers of assets and liabilities between entities under common control are to be initially recorded on the books of the receiving entity at the carrying value of the transferor. Any difference between consideration given and the carrying value of the assets or liabilities received is treated as a capital distribution or contribution.

~~Purchase~~Lease ofand ~~New~~Sale of Compression Equipment ~~from~~with Archrock

InIf ~~connection~~Archrock ~~with~~determines ~~the~~in ~~Spin-off,~~good faith that we ~~entered~~or ~~into~~Archrock’s acontract ~~supply~~operations ~~agreement~~services ~~with~~business ~~Exterran~~needs ~~Corporation~~to ~~under~~lease ~~which~~or wesell ~~were~~compression ~~obligated,~~equipment ~~until~~between ~~November~~Archrock ~~2017~~and us, the Omnibus Agreement permits such transactions if it will not cause us to ~~purchase~~breach ~~our~~any ~~requirements~~existing contracts, suffer a loss of ~~newly-fabricated~~revenue ~~compression~~under ~~equipment~~an ~~from~~existing ~~Exterran~~contract ~~Corporation~~operations ~~and~~services ~~its~~contract ~~affiliates,~~or ~~subject~~incur toany ~~certain~~unreimbursed ~~exceptions~~costs. ~~Prior~~As toconsideration for the ~~Spin-off,~~lease weof ~~were~~compression ~~able~~equipment the transferee will agree to ~~purchase~~lease ~~newly-fabricated~~such compression equipment from ~~Archrock~~the ortransferor. ~~its~~As ~~affiliates~~consideration atfor ~~Archrock’s~~the ~~cost~~sale toof ~~fabricate~~compression ~~such~~ equipment, ~~plus~~the transferee will make a ~~fixed~~distribution ~~margin.~~to ~~During~~or receive a contribution from the ~~year~~transferor ~~ended~~in ~~December 31,~~an ~~2015,~~amount weequal ~~purchased~~to ~~$171.7~~the ~~million~~net book value of ~~newly-fabricated~~the compression equipment ~~from Archrock~~sold.

The purchased equipment was recorded in our consolidated balance sheet as property, plant and equipment of $159.0 million, which represents the carrying value of the Archrock affiliates that sold it to us, and a distribution of equity of $12.7 million which represents the fixed margin we paid above the carrying value in accordance with the Omnibus Agreement.Leases

~~Transfer,~~The ~~Exchange~~following ortable ~~Lease~~summarizes the aggregate cost and accumulated depreciation of ~~Compression~~equipment ~~Equipment~~on ~~with~~lease to and from Archrock (in thousands):



	December 31,
	2018		2017
Equipment on lease to Archrock
Aggregate cost	$	3,824	$	3,560
Accumulated depreciation	164		272

Equipment on lease from Archrock
Aggregate cost	$	5,040	$	224
Accumulated depreciation	2,659		34

The following table summarizes the revenue from Archrock related to the lease of our compression equipment and the cost of sales related to the lease of Archrock compression equipment (in thousands):



	Year Ended December 31,
	2018		2017		2016
Revenue	$	1,440	$	708	$	123
Cost of sales	2,797		1,008		270

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Transfer and Exchange of Overhauls. During the years ended December 31, 2017, 2016 and 2015, Archrock contributed to us $5.2 million, $1.2 million and $9.6 million, respectively, primarily related to the completion of overhauls on compression equipment that was exchanged with us or contributed to us and where overhauls were in progress on the date of exchange or contribution.Sales

~~Other Exchanges.~~ The following table summarizes ~~the~~compressor ~~transfer~~unit sales activity between Archrock and us (dollars in thousands):

	Transferred to Archrock						Transferred from Archrock
	Year Ended December 31, 2018
	Year Ended December 31,						Year Ended December 31,
	Sold to Archrock		Purchased from Archrock
	2017		2016		2015		2017		2016		2015
Compressor units	85		184
Compressor units	249		462		349		251		339		260
Horsepower	53,624		107,431
Horsepower	156,600		205,000		112,800		145,000		154,000		99,600
Net book value	$	38,441	$	39,937
Net book value	$	78,856	$	92,382	$	54,703	$	74,874	$	96,216	$	46,784

During the ~~years~~year ended December 31, ~~2017~~2018, ~~2016 and 2015,~~ we recorded a capital ~~distributions~~contribution of $41.05 million, ~~capital~~related ~~contributions~~to the difference in net book value of ~~$3.8~~the ~~million~~compression equipment sold to and acquired from Archrock. In addition, in accordance with the Omnibus Agreement, we recorded a capital ~~distributions~~distribution of $714.90 million, ~~respectively,~~which ~~related~~represented to the ~~differences~~net inexcess ~~net~~of ~~book~~the fair market value onof the ~~exchanged~~equipment ~~compression~~purchased from Archrock over the equipment sold to Archrock. No customer contracts were included in ~~the~~these ~~transfers~~sales.

~~Leases. The following table summarizes the aggregate cost and accumulated depreciation of equipment on lease to Archrock (in thousands):~~Exchanges

	December 31, 2017		December 31, 2016
Aggregate cost	$	3,560	$	4,326
Accumulated depreciation	272		692

The TCJA made significant changes to the determination of partnership taxable income that included the cessation of like-kind exchange treatment for exchanges of tangible personal property. In accordance with this change, we no longer perform such exchanges as of January 1, 2018. The following table summarizes the like-kind exchange activity between Archrock and us in 2017 and 2016 prior to the enactment of the TCJA (dollars in thousands):

The following table summarizes the revenue from Archrock related to the lease of our compression equipment and the cost of sales related to the lease of Archrock compression equipment (in thousands):



	Transferred to Archrock				Transferred from Archrock
	Year Ended December 31,				Year Ended December 31,
	2017		2016		2017		2016
Compressor units	249		462		251		339
Horsepower	156,600		205,000		145,000		154,000
Net book value	$	78,856	$	92,382	$	74,874	$	96,216

	Year Ended December 31,
	2017		2016		2015
Revenue	$	708	$	123	$	201
Cost of sales	1,008		270		1,679

During the years ended December 31, 2017 and 2016, we recorded capital distributions of $4.0 million and capital contributions of $3.8 million, respectively, related to the differences in net book value of exchanged compression equipment. No customer contracts were included in the exchanges.

Transfer of Overhauls

During the years ended December 31, 2018, 2017 and 2016, Archrock contributed to us $2.9 million, $5.2 million and $1.2 million, respectively, related to the completion of overhauls on compression equipment that was sold to us during 2018 or exchanged with us during 2017 and 2016 and where the overhauls were in progress on the date of the sale or exchange.

Reimbursement of Operating and SG&A Expense

Included in our cost of sales during the years ended December 31, 2017, 2016 and 2015 were $17.3 million, $4.8 million and $4.1 million, respectively, of indirect costs incurred by Archrock. Included in SG&A during the years ended December 31, 2017, 2016 and 2015 were $68.7 million, $68.8 million and $75.6 million, respectively, of indirect costs incurred by Archrock.

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5Included in our cost of sales during the years ended December 31, 2018, 2017 and 2016 were $14.1 ~~Intangible~~million, ~~Assets~~$17.3 million and $4.8 million, ~~net~~respectively, of indirect costs incurred by Archrock. Included in SG&A during the years ended December 31, 2018, 2017 and 2016 were $66.6 million, $68.7 million and $68.8 million, respectively, of indirect costs incurred by Archrock.

~~Intangible~~6. ~~assets,~~Contract ~~net~~Costs ~~consisted of the following (in thousands):~~

	December 31, 2017					December 31, 2016
	Gross CarryingAmount		AccumulatedAmortization			Gross CarryingAmount		AccumulatedAmortization
Customer related (9-25 year life)	$	56,707	$	(22,713	)	$	56,707	$	(19,284	)
Contract based (5-9 year life)	68,395		(41,642		)	68,395		(29,155		)
Intangible assets	$	125,102	$	(64,355	)	$	125,102	$	(48,439	)

We capitalize incremental costs to obtain a contract with a customer if we expect to recover those costs. Capitalized costs include commissions paid to our sales force to obtain contract operations contracts. As of December 31, and January 1, 2018, we recorded contract costs of $3.6 million and $2.0 million, respectively, associated with sales commissions.

~~Amortization~~We ofcapitalize ~~intangible~~costs ~~assets~~incurred ~~totaled~~to ~~$15.9~~fulfill ~~million~~a contract if those costs relate directly to a contract, ~~$15.8~~enhance ~~million~~resources that we will use in satisfying performance obligations and ~~$14~~if we expect to recover those costs.6 ~~million~~Capitalized ~~during~~costs incurred to fulfill our customer contracts include freight charges to transport compressor assets before transferring services to the ~~years~~customer ~~ended~~and mobilization activities associated with our contract operations services. As of December 31, ~~2017~~and January 1, ~~2016~~2018, we recorded contract costs of $28.6 million and ~~2015~~$14.3 million, respectively, associated with freight and mobilization.

Contract operations costs are amortized based on the transfer of service to which the assets relate, which is estimated to be 36 months based on average contract term, including anticipated renewals. We assess periodically whether the 36-month estimate fairly represents the average contract term and adjust as appropriate. Contract costs associated with commissions are amortized to SG&A. Contract costs associated with freight and mobilization are amortized to cost of sales (excluding depreciation and amortization). During the year ended December 31, 2018, we amortized $1.3 million related to commissions and $10.4 million related to freight and mobilization. During the year ended December 31, 2018, there were no impairment losses recorded in relation to the costs capitalized.

7. Intangible Assets, net

Intangible assets include customer relationships and contracts associated with various business and asset acquisitions. The acquired intangible assets were recorded at fair value determined as of the acquisition date. For those intangible assets related to customer relationships acquired from Archrock, amounts were allocated to us based on the ratio of the fair value of the net assets transferred to us to the total fair value of Archrock’s contract operations business. Our intangible assets are being amortized over the period we expect to benefit from the assets. Intangible assets, net consisted of the following (in thousands):



	December 31, 2018					December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer related (9-25 year life)	$	56,707	$	(25,908	)	$	56,707	$	(22,713	)
Contract based (5-7 year life)	64,556		(49,516		)	68,395		(41,642		)
Intangible assets	$	121,263	$	(75,424	)	$	125,102	$	(64,355	)

Amortization of intangible assets totaled $14.9 million, $15.9 million and $15.8 million during the years ended December 31, 2018, 2017 and 2016, respectively.

Estimated future intangible amortization expense is as follows (in thousands):

2018	$	14,908
2019	$	11,623
2019	11,623
2020	8,286
2021	3,541
2022	2,472
Thereafter	19,917
2023	2,334
Total	$	60,747
Thereafter	17,583
Total	$	45,839

6. Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

	December 31,
	2017		2016
Accrued income and other taxes (1)	$	5,675	$	2,902
Accrued other liabilities	3,221		1,550
Accrued liabilities	$	8,896	$	4,452

——————

(1) Represents accruals for taxes including accruals for ad valorem tax, sales tax and use tax.

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78. ~~Long-Term~~Accrued ~~Debt~~Liabilities

Accrued liabilities consisted of the following (in thousands):



	December 31,
	2018		2017
Accrued income and other taxes ⁽¹⁾	$	6,187	$	5,675
Accrued other liabilities	3,942		1,922
Accrued liabilities	$	10,129	$	7,597

——————


⁽¹⁾	Represents accruals for taxes including ad valorem tax, sales tax and use tax.

9. Long-Term Debt

Long-term debt consisted of the following (in thousands):

	December 31, 2017			December 31, 2016
	December 31,
Credit Facility	$	674,306		$	—
	2018			2017
Former revolving credit facility	—			509,500
Credit Facility	$	839,500		$	674,306
Former term loan facility	—			150,000
Less: Deferred financing costs, net of amortization	—			(353		)
	—			149,647
6% senior notes due April 2021	350,000			350,000
Less: Debt discount, net of amortization	(21,~~523~~789		)	(32,~~213~~523		)
Less: Deferred financing costs, net of amortization	(32,~~338~~311		)	(43,~~366~~338		)
	344,139			342,421
	345,900			344,139
6% senior notes due October 2022	350,000			350,000
Less: Debt discount, net of amortization	(32,~~441~~766		)	(43,~~076~~441		)
Less: Deferred financing costs, net of amortization	(3,~~951~~133		)	(43,~~768~~951		)
	342,608			341,156
	344,101			342,608
Long-term debt	$	1,~~361~~529,~~053~~501		$	1,~~342~~361,~~724~~053

Credit Facility

~~On March 30, 2017, we entered into the Credit Facility, a five-year, $1.1 billion asset-based revolving credit facility.~~ The Credit Facility will mature on March 30, 2022, except that if any portion of our 6% senior notes due April 2021 are outstanding as of December 2, 2020, ~~then~~it ~~the Credit Facility~~ will instead mature on December 2, 2020. WeIn March 2017, we incurred $14.9 million in transaction costs related to the formation of the Credit Facility, which were included in other long-term assets in our consolidated balance sheets and are being amortized over the term of the ~~Credit Facility~~facility. Concurrent with entering into the Credit Facility, we terminated our Former Credit Facility, and all commitments under the facility, and repaid $648.4 million in borrowings and accrued and unpaid interest and fees outstanding. ~~All commitments under the Former Credit Facility have been terminated.~~ As a result of the termination, we expensed $0.6 million of unamortized deferred financing costs ~~associated with the $825.0 million revolving credit facility~~, which ~~was~~were included in interest expense in our consolidated statements of operations~~. Additionally~~, weand recorded a debt extinguishment loss of $0.3 million ~~related to the extinguishment of the $150~~.~~0 million term loan.~~

On AsFebruary ~~of December 31~~23, ~~2017~~2018, we ~~had~~amended ~~$674.3~~the ~~million~~Credit inFacility ~~outstanding~~to, ~~borrowings~~among ~~and~~other ~~no outstanding letters of credit under the Credit Facility.~~things:

~~Subject~~• toincrease ~~certain conditions, including~~ the ~~approval~~maximum byTotal ~~the~~Debt ~~lenders, we are able~~ to ~~increase~~EBITDA ~~the~~ratios, ~~aggregate~~as ~~commitments~~defined ~~under~~in the Credit Facility byagreement up(see tobelow anfor ~~additional $250.0 million. Portions of~~ the ~~Credit~~revised ~~Facility~~ratios), upeffective toas ~~$25.0~~of ~~million and $50.0 million will be available for~~ the ~~issuance~~execution of ~~letters~~Amendment ofNo. ~~credit~~1 ~~and~~on ~~swing~~February ~~line loans~~23, ~~respectively.~~2018; and

~~The~~• ~~Credit~~effective ~~Facility~~upon ~~bears~~completion ~~interest at a base rate or LIBOR, at our option, plus an applicable margin. Depending on our leverage ratio, the applicable margin varies (i) in the case~~ of ~~LIBOR loans, from 2.00% to 3.25% and (ii) in~~ the ~~case~~Merger of base rate loans, from 1.00% to 2.25%. The base rate is the highest of (i) the prime rate announced by JPMorgan Chase Bank, (ii) the Federal Funds Effective Rate plus 0.50% and (iii) one-month LIBOR plus 1.00%. At December 31, 2017, the applicable margin on ~~amounts~~April ~~outstanding was 3.2%. The weighted average annual interest rate at December 31~~26, ~~2017 and 2016 on the outstanding balance under the Credit Facility and the Former Credit Facility, respectively, excluding the effect of interest rate swaps, was 4.8% and 3.7%, respectively.~~2018:


–	increase the aggregate revolving commitment from $1.1 billion to $1.25 billion;


–	increase the amount available for the issuance of letters of credit from $25.0 million to $50.0 million;


–	increase the basket sizes under certain covenants including covenants limiting our ability to make investments, incur debt, make restricted payments, incur liens and make asset dispositions;

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~~Additionally,~~– wename ~~are~~Archrock ~~required~~Services, toL.P., ~~pay~~one ~~commitment fees based on the daily unused amount~~ of ~~the Credit Facility in an amount, depending on~~ our ~~leverage ratio~~subsidiaries, ~~ranging~~as ~~from~~a ~~0.375%~~borrower tounder ~~0.50%.~~our ~~We incurred $2.1 million in commitment fees on the daily unused amount of the~~ Credit Facility and ~~$1.4~~certain ~~million and $1.8 million in commitment fees on the daily unused amount~~ of ~~the~~our ~~Former~~other ~~Credit~~subsidiaries ~~Facility~~as ~~during~~loan ~~the~~guarantors; ~~years ended December 31, 2017, 2016~~ and ~~2015, respectively.~~

~~The~~– ~~Credit~~amend ~~Facility~~the ~~borrowing~~definition ~~base consists~~ of ~~eligible~~“Borrowing ~~accounts~~Base” ~~receivable,~~to ~~inventory~~include ~~and~~certain ~~compressor~~assets ~~units.~~of ~~The~~ours ~~largest~~and ~~component~~our ~~is eligible compressor units~~subsidiaries.

~~Borrowings~~We ~~under~~incurred ~~the~~$3.3 ~~Credit~~million ~~Facility~~in ~~are~~transaction ~~secured~~costs byrelated ~~substantially~~to ~~all~~Amendment ofNo. ~~the~~1 ~~personal~~which ~~property~~were ~~assets~~included ofin usother ~~and~~long-term ~~our~~assets ~~Significant~~in ~~Domestic~~our ~~Subsidiaries~~consolidated ~~(as~~balance ~~defined~~sheet inand ~~the~~are ~~Credit~~being ~~Facility~~amortized ~~agreement),~~over ~~including all of~~ the ~~membership~~term ~~interests~~ of ~~our Domestic Subsidiaries (as defined in~~ the Credit Facility ~~agreement)~~.

~~The~~Subject ~~Credit Facility agreement contains various covenants including, but not limited~~ to, ~~restrictions on the use of proceeds from borrowings and limitations on our ability to incur additional indebtedness, engage in transactions with affiliates, merge or consolidate, sell assets, make~~ certain ~~investments and acquisitions~~conditions, ~~make~~including ~~loans,~~the ~~grant~~approval ~~liens,~~by ~~repurchase equity and pay distributions. The Credit Facility agreement also contains various covenants requiring mandatory prepayments from~~ the ~~net cash proceeds of certain asset transfers. In addition~~lenders, ~~if as of any date~~ we ~~have~~are ~~cash~~able ~~(other~~to ~~than~~increase ~~proceeds~~the ~~from~~aggregate acommitments ~~debt~~under ~~or equity issuance received in~~ the 30Credit ~~days~~Facility ~~prior~~by toup ~~such date reasonably expected~~ to bean ~~used~~additional to$250.0 ~~fund~~million. anPortions ~~acquisition~~of ~~permitted under~~ the Credit Facility ~~agreement)~~up into ~~excess of~~ $50.0 million, ~~then such excess amount~~ will be ~~used~~available tofor ~~pay~~the ~~down~~issuance ~~outstanding borrowings~~ of aswing ~~corresponding~~line ~~amount under the Credit Facility~~loans.

EBITDA to Interest Expense	2.5 to 1.0
Senior Secured Debt to EBITDA	3.5 to 1.0
Total Debt to EBITDA
Through fiscal year 2017	5.95 to 1.0
Through fiscal year 2018	5.75 to 1.0
Through second quarter of 2019	5.50 to 1.0
Thereafter (1)	5.25 to 1.0

The Credit Facility bears interest at a base rate or LIBOR, at our option, plus an applicable margin. Depending on our leverage ratio, the applicable margin varies (i) in the case of LIBOR loans, from 2.00% to 3.25% and (ii) in the case of base rate loans, from 1.00% to 2.25%. The base rate is the highest of (i) the prime rate announced by JPMorgan Chase Bank, (ii) the Federal Funds Effective Rate plus 0.50% and (iii) one-month LIBOR plus 1.00%. At December 31, 2018, the applicable margin on amounts outstanding was 2.7%. The weighted average annual interest rate at December 31, 2018 and 2017 on the outstanding balance under the facility, excluding the effect of interest rate swaps, was 5.4% and 4.8%, respectively.

Additionally, we are required to pay commitment fees based on the daily unused amount of the Credit Facility in an amount, depending on our leverage ratio, ranging from 0.375% to 0.50%. We incurred $2.1 million, $2.1 million and $1.4 million in commitment fees on the daily unused amount of our facilities during the years ended December 31, 2018, 2017 and 2016, respectively.

Our Credit Facility borrowing base consists of eligible accounts receivable, inventory and compressor units. The largest component is eligible compressor units. Borrowings under the Credit Facility are secured by substantially all of our personal property assets and our Significant Domestic Subsidiaries (as defined in our Credit Facility agreement), including all of the membership interests of our Domestic Subsidiaries (as defined in our Credit Facility agreement).

Our Credit Facility agreement contains various covenants including, but not limited to, restrictions on the use of proceeds from borrowings and limitations on our ability to incur additional indebtedness, engage in transactions with affiliates, merge or consolidate, sell assets, make certain investments and acquisitions, make loans, grant liens, repurchase equity and pay distributions. Our Credit Facility agreement also contains various covenants requiring mandatory prepayments from the net cash proceeds of certain asset transfers. In addition, if as of any date we have cash and cash equivalents (other than proceeds from a debt or equity issuance received in the 30 days prior to such date reasonably expected to be used to fund an acquisition permitted under the Credit Facility agreement) in excess of $50.0 million, then such excess amount will be used to pay down outstanding borrowings of a corresponding amount under our Credit Facility.

We must maintain the following consolidated financial ratios, as defined in our Credit Facility agreement:



EBITDA to Interest Expense	2.5 to 1.0
Senior Secured Debt to EBITDA	3.5 to 1.0
Total Debt to EBITDA
Through fiscal year 2018	5.95 to 1.0
Through fiscal year 2019	5.75 to 1.0
Through second quarter of 2020	5.50 to 1.0
Thereafter ⁽¹⁾	5.25 to 1.0

——————

AsA ofmaterial ~~December 31~~adverse effect on our assets, ~~2017~~liabilities, wefinancial ~~had~~condition, ~~undrawn~~business ~~capacity~~or ofoperations ~~$425.7~~that, ~~million~~taken as a whole, impacts our ability to perform its obligations under the Credit Facility. Asagreement, could lead to a ~~result~~default under that agreement. A default under one of ~~the~~our ~~financial~~debt ~~ratio~~agreements ~~requirements~~would ~~discussed~~trigger ~~above,~~cross-default ~~$128.4~~provisions ~~million~~under ofour ~~the~~other ~~$425.7~~debt ~~million~~agreements, ofwhich ~~undrawn~~would ~~capacity~~accelerate ~~was~~our ~~available~~obligation ~~for~~to ~~additional~~repay ~~borrowings~~our asindebtedness under those agreements. As of December 31, ~~2017~~2018, we were in compliance with all financial covenants under the Credit Facility.

A material adverse effect on our assets, liabilities, financial condition, business or operations that, taken as a whole, impacts our ability to perform our obligations under the Credit Facility agreement, could lead to a default under that agreement. A default under one of our debt agreements would trigger cross-default provisions under our other debt agreements, which would accelerate our obligation to repay our indebtedness under those agreements. As of December 31, 2017, we were in compliance with all covenants under the Credit Facility.

During the years ended December 31, 2016 and 2015, we incurred transaction costs of $1.7 million and $1.3 million, respectively, related to amendments to the Former Credit Facility which were reflected in other long-term assets in our consolidated balance sheets and are being amortized over the term of the Former Credit Facility. During the year ended December 31, 2016, we expensed $0.4 million of unamortized deferred financing costs as a result of an amendment to the Former Credit Facility, which was reflected in interest expense in our consolidated statement of operations.

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~~The~~As ~~Notes~~of December 31, 2018, we had $15.2 million outstanding letters of credit under the Credit Facility and undrawn capacity of $395.3 million. As a result of the ratio requirements above, $391.6 million of the $395.3 million of undrawn capacity was available for additional borrowings as of December 31, 2018. As of December 31, 2018, we were in compliance with all covenants under the Credit Facility agreement.

~~The~~During ~~Notes~~the ~~are~~year ~~guaranteed~~ended onDecember a31, ~~senior~~2016, ~~unsecured~~we ~~basis~~incurred bytransaction ~~all~~costs of ~~our existing subsidiaries (other than Archrock Partners Finance Corp~~$1.,7 ~~which~~million ~~is a co-issuer of the Notes)~~ and ~~certain~~expensed ~~of our future subsidiaries~~$0.4 ~~The~~million ~~Notes and the guarantees, respectively, are our and the guarantors’ general unsecured senior obligations, rank equally in right~~ of ~~payment~~unamortized ~~with~~deferred ~~all~~financing ofcosts ~~our~~related ~~and the guarantors’ other senior obligations, and are effectively subordinated~~ to ~~all~~an ofamendment ~~our and the guarantors’ existing and future secured debt~~ to the ~~extent~~Former ofCredit ~~the~~Facility ~~value~~which ofwere ~~the~~reflected ~~collateral~~in ~~securing such indebtedness. In addition, the Notes and guarantees are effectively subordinated to all existing and future indebtedness and~~ other ~~liabilities of any future non~~long-~~guarantor~~term ~~subsidiaries.~~assets ~~All~~in of our ~~subsidiaries~~consolidated ~~are~~balance ~~100%~~sheet ~~owned, directly or indirectly, by us~~ and ~~guarantees~~interest byexpense ~~our~~in ~~subsidiaries are full and unconditional and constitute joint and several obligations. We have no assets or operations independent of~~ our ~~subsidiaries~~consolidated ~~and~~statement there are no significant restrictions upon our subsidiaries’ ability to distribute funds to us. Archrock Partners Finance Corp. has no operations and does not have revenue other than as may be incidental as co-issuer of ~~the Notes. Because we have no independent~~ operations, ~~the guarantees are full and unconditional (subject to customary release provisions) and constitute joint and several obligations of our subsidiaries other than Archrock Partners Finance Corp~~respectively.~~, and as a result we have not included consolidated financial information of our subsidiaries.~~

~~The Partnership’s 6% Senior~~ Notes ~~Due April 2021~~

InThe ~~March 2013,~~Notes ~~the~~are ~~Partnership~~guaranteed ~~issued~~on ~~$350~~a senior unsecured basis by all of our existing subsidiaries (other than Archrock Partners Finance Corp.0, ~~million~~which ~~aggregate~~is ~~principal~~a ~~amount~~co-issuer of our 6% ~~senior~~Senior ~~notes~~Notes due April 2021) and certain of our future subsidiaries. ~~These~~The ~~notes~~Notes ~~were~~and ~~issued~~the atguarantees, anrespectively, ~~original~~are ~~issuance~~our ~~discount~~and the guarantors’ general unsecured senior obligations, rank equally in right of $5payment with all of our and the guarantors’ other senior obligations and are effectively subordinated to all of our and the guarantors’ existing and future secured debt to the extent of the value of the collateral securing such indebtedness.5 ~~million~~In addition, ~~which~~the isNotes ~~being~~and ~~amortized~~guarantees atare aneffectively ~~effective~~subordinated ~~interest~~to ~~rate~~all existing and future indebtedness and other liabilities of 6any future non-guarantor subsidiaries.25 All of our subsidiaries are 100% ~~over~~owned, ~~their~~directly ~~term~~or indirectly, by us and guarantees by our subsidiaries are full and unconditional and constitute joint and several obligations. InWe ~~January 2014,~~have ~~holders~~no assets or operations independent of ~~these~~our ~~notes~~subsidiaries ~~exchanged~~and ~~their~~there ~~notes~~are ~~for~~no ~~registered~~significant ~~notes~~restrictions ~~with~~upon our subsidiaries’ ability to distribute funds to us. Archrock Partners Finance Corp. has no operations and does not have revenue other than as may be incidental as co-issuer of the ~~same~~Notes. ~~terms~~Because we have no independent operations, the guarantees are full and unconditional (subject to customary release provisions) and constitute joint and several obligations of our subsidiaries other than Archrock Partners Finance Corp. and as a result, we have not included consolidated financial information of our subsidiaries.

~~The Partnership may redeem all or a part of these notes at redemption prices (expressed as percentages of principal amount) equal to 103.00~~6% ~~for~~Senior ~~the~~Notes ~~twelve-month~~Due ~~period beginning on~~ April 1, 2017, 101.500% for the twelve-month period beginning on April 1, 2018 and 100.00% for the twelve-month period beginning on April 1, 2019 and at any time thereafter, plus accrued and unpaid interest, if any, to the applicable redemption date.2021

~~The~~In ~~Partnership’s~~March 2013, we issued $350.0 million aggregate principal amount of 6% ~~Senior~~senior ~~Notes~~notes ~~Due~~due ~~October~~April 2021. ~~2022~~These notes were issued at an original issuance discount of $5.5 million, which is being amortized at an effective interest rate of 6.25% over their term. In January 2014, holders of these notes exchanged their notes for registered notes with the same terms.

InWe ~~April 2014,~~may ~~the~~redeem ~~Partnership~~all ~~issued~~or ~~$350.0~~a ~~million~~part ~~aggregate principal amount~~ of 6%these ~~senior~~ notes ~~due~~at ~~October~~redemption ~~2022.~~prices ~~These~~(expressed ~~notes~~as ~~were~~percentages ~~issued~~of atprincipal anamount) ~~original~~equal ~~issuance~~to ~~discount of $5~~101.75% ~~million,~~for ~~which~~the is12-month ~~being~~period ~~amortized~~beginning aton anApril 1, ~~effective~~2018 ~~interest~~and ~~rate of 6~~100.250% ~~over~~for ~~their~~the ~~term.~~12-month Inperiod ~~February~~beginning on April ~~2015~~1, ~~holders~~2019 ofand ~~these~~at ~~notes~~any ~~exchanged~~time ~~their~~thereafter, ~~notes~~plus ~~for~~accrued ~~registered~~and ~~notes~~unpaid ~~with~~interest, if any, to the ~~same~~applicable ~~terms~~redemption date.

Prior to April 1, 2018, the Partnership may redeem all or a part of these notes at a redemption price equal to the sum of (i) the principal amount thereof, plus (ii) a make-whole premium at the redemption date, plus accrued and unpaid interest, if any, to the redemption date. On or after April 1, 2018, the Partnership may redeem all or a part of these notes at redemption prices (expressed as percentages of principal amount) equal to 103.006% ~~for~~Senior ~~the~~Notes ~~twelve-month~~Due ~~period~~October beginning on April 1, 2018, 101.500% for the twelve-month period beginning on April 1, 2019 and 100.00% for the twelve-month period beginning on April 1, 2020 and at any time thereafter, plus accrued and unpaid interest, if any, to the applicable redemption date.2022

~~Long-Term~~In ~~Debt~~April 2014, ~~Maturity~~we ~~Schedule~~issued $350.0 million aggregate principal amount of 6% senior notes due October 2022. These notes were issued at an original issuance discount of $5.7 million, which is being amortized at an effective interest rate of 6.25% over their term. In February 2015, holders of these notes exchanged their notes for registered notes with the same terms.

~~Contractual~~On ~~maturities~~or after April 1, 2018, we may redeem all or a part of ~~long-term~~these ~~debt~~notes at redemption prices (~~excluding~~expressed ~~interest~~as topercentages beof ~~accrued~~principal ~~thereon~~amount) atequal ~~December~~to 103.0% for the 12-month period beginning on April 311, ~~2017~~2018, ~~are~~101.5% asfor ~~follows~~the ~~(in~~12-month ~~thousands):~~period beginning on April 1, 2019 and 100.0% for the 12-month period beginning on April 1, 2020 and at any time thereafter, plus accrued and unpaid interest, if any, to the applicable redemption date.

	December 31, 2017
2018	$	—
2019	—
2020	—
2021 (1)	350,000
2022 (1)	1,024,306
Total debt (1)	$	1,374,306

——————

(1) Include the full face value of the Notes and have not been reduced by the aggregate unamortized discount of $6.0 million and the aggregate unamortized deferred financing costs of $7.3 million as of December 31, 2017.

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Table of Contents

8.Long-Term ~~Partners'~~Debt ~~Capital~~Maturity Schedule

~~Unit~~Contractual ~~Transactions~~maturities of long-term debt, excluding interest to be accrued, at December 31, 2018 were as follows (in thousands):

In August 2017, we sold, pursuant to a public underwritten offering, 4,600,000 common units, including 600,000 common units pursuant to an over-allotment option. We received net proceeds of $60.3 million, after deducting underwriting discounts, commissions and offering expenses, which we used to repay borrowings outstanding under our revolving credit facility. In connection with this sale and as permitted under our Partnership Agreement, we sold 93,163 general partner units to our General Partner so it could maintain its approximate 2% general partner interest in us. We received net proceeds of $1.3 million from the General Partner contribution.



2019	$	—
2020	—
2021 ⁽¹⁾	350,000
2022 ⁽¹⁾	1,189,500
2023	—
Total debt ⁽¹⁾	$	1,539,500

During the year ended December 31, 2017, we issued and sold 94,803 general partner units, including the 93,163 units sold in the offering discussed above, to our General Partner so it could maintain its approximate 2% general partner interest in us.

As of December 31, 2017, Archrock owned 29,064,637 common units and 1,421,768 general partner units, collectively representing an approximate 43% interest in us.

Cash Distributions

We make distributions of available cash (as defined in our Partnership Agreement) from operating surplus in the following manner:

• first, 98% to all common unitholders, pro rata, and 2% to our General Partner, until each unit has received a distribution of $0.4025;

• second, 85% to all common unitholders, pro rata, and 15% to our General Partner, until each unit has received a distribution of $0.4375;

• third, 75% to all common unitholders, pro rata, and 25% to our General Partner, until each unit has received a total of $0.5250; and

• thereafter, 50% to all common unitholders, pro rata, and 50% to our General Partner.

The general partner units also have the right to receive incentive distributions of cash in excess of the minimum quarterly distributions.

The following table summarizes our distributions per unit for 2017, 2016 and 2015:

Period Covering	Payment Date	Distribution perCommon Unit		Total Distribution(in thousands)
1/1/2015 — 3/31/2015	May 15, 2015	$	0.5625	$	35,903	(1)
4/1/2015 — 6/30/2015	August 14, 2015	0.5675		39,084		(1)
7/1/2015 — 9/30/2015	November 13, 2015	0.5725		39,680		(1)
10/1/2015 — 12/31/2015	February 12, 2016	0.5725		39,680		(1)
1/1/2016 — 3/31/2016	May 13, 2016	0.2850		17,513
4/1/2016 — 6/30/2016	August 15, 2016	0.2850		17,513
7/1/2016 — 9/30/2016	November 14, 2016	0.2850		17,513
10/1/2016 — 12/31/2016	February 14, 2017	0.2850		19,107
1/1/2017 — 3/31/2017	May 15, 2017	0.2850		19,124
4/1/2017 — 6/30/2017	August 14, 2017	0.2850		20,459
7/1/2017 — 9/30/2017	November 14, 2017	0.2850		20,459
10/01/2017 — 12/31/2017	February 13, 2018	0.2850		20,455

——————

(1) ~~Incentive~~Includes ~~distributions~~the tofull ~~our~~face ~~General~~value ~~Partner~~of onthe ~~its~~Notes ~~incentive~~and ~~distribution~~has ~~rights~~not been reduced by the aggregate unamortized discount of $4.6 million and the aggregate unamortized deferred financing costs of $5.4 million as of December 31, 2018.

10. Partners’ Capital

Merger Transaction

On April 26, 2018, Archrock completed the acquisition of all of our outstanding common units that it did not already own and, as a result, we became its wholly-owned subsidiary. With the closing of the Merger, Archrock issued 57.6 million shares of its common stock at a fixed exchange ratio of 1.40 shares for each of the 41.2 million common units not owned by Archrock prior to the Merger. Additionally, all outstanding treasury units were retired and our incentive distribution rights, all of which were previously owned by Archrock prior to the Merger, were canceled and ceased to exist. As a result of the Merger, our common units are no longer publicly traded. Our Notes were not impacted by the Merger and remain outstanding.

Prior to the Merger, public unitholders held a 57% ownership interest in us and Archrock owned our remaining equity interests, including 29,064,637 common units and 1,422,458 general partner units, collectively representing a 43% interest.

Capital Offering

In August 2017, we sold, pursuant to a public underwritten offering, 4,600,000 common units, including 600,000 common units, pursuant to an over-allotment option. We received net proceeds of $60.3 million after deducting underwriting discounts, commissions and offering expenses, which we used to repay borrowings outstanding under our Credit Facility. In connection with this sale and as permitted under our Partnership Agreement, we sold 93,163 general partner units to our General Partner so it could maintain its 2% general partner interest in us. We received net proceeds of $1.3 million from the General Partner contribution.

Cash Distributions

As of the closing of the Merger, any distributions are paid to Archrock as the owner of all outstanding common and general partner units. Prior to the Merger, we made cash distributions of available cash (as defined in our Partnership Agreement) from operating surplus in the following manner:


•	first, 98% to all common unitholders, pro rata, and 2% to our general partner, until each unit has received a distribution of $0.4025;


•	second, 85% to all common unitholders, pro rata, and 15% to our general partner, until each unit has received a distribution of $0.4375;


•	third, 75% to all common unitholders, pro rata, and 25% to our general partner, until each unit has received a total of $0.5250; and


•	thereafter, 50% to all common unitholders, pro rata, and 50% to our general partner.

On January 29, 2019, our board of directors declared a quarterly distribution of $0.2400 per common unit that was paid on February 13, 2019.

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Table of Contents

911. Unit-Based Compensation

During the years ended December 31, ~~2017~~2018, ~~2016~~2017 and ~~2015~~2016, we recognized $10.13 million, $1.21 million and $1.12 million of unit-based compensation expense, respectively, which excludes unit-based compensation expense that was charged back to Archrock of $0.51 million, $0.65 million and $10.26 million, respectively.

Long-Term Incentive Plan

In April 2017, we adopted the 2017 LTIP to provide for the benefit of the employees, directors and consultants of us, Archrock and our respective affiliates. ~~Two~~The ~~million~~2006 ~~common~~LTIP ~~units~~expired in 2016 and, as such, no further grants have been ~~authorized~~or ~~for~~can ~~issuance~~be ~~with~~made ~~respect~~under tothat ~~awards~~plan following expiration. Previous grants made under the ~~2017~~2006 LTIP. ~~The~~continue ~~2017~~to ~~LTIP~~be ~~provides~~governed ~~for~~by the ~~issuance~~2006 ofLTIP ~~unit~~and ~~options,~~the ~~unit~~applicable ~~appreciation~~award ~~rights,~~agreements. ~~restricted~~Because ~~units,~~we grant phantom units, ~~performance~~to ~~awards~~non-employees, ~~bonus~~we ~~awards,~~are ~~distribution~~required ~~equivalent~~to ~~rights,~~remeasure ~~cash~~the ~~awards~~fair ~~and~~value ~~other~~of ~~unit-based~~these ~~awards.~~phantom ~~The~~units, ~~2017~~which ~~LTIP~~is ~~will~~based beon ~~administered by~~ the ~~compensation~~fair ~~committee~~value of our ~~board~~common units, each period and record a cumulative adjustment of ~~directors~~the expense previously recognized. ~~The~~During ~~2006~~the ~~LTIP~~years ~~expired~~ended inDecember 31, ~~2016~~2018, 2017 and 2016, aswe ~~such,~~recorded noan ~~further~~immaterial ~~grants~~adjustment ~~can~~to beSG&A ~~made~~expense ~~under~~related ~~that~~to ~~plan~~the fair value remeasurement of phantom units. ~~Previous~~Phantom ~~grants~~units ~~made~~granted under the 2017 and 2006 LTIP ~~will~~may ~~continue~~include nonforfeitable tandem distribution equivalent rights to bereceive ~~governed~~cash bydistributions on unvested phantom units in the ~~2006~~quarter ~~LTIP~~in ~~and~~which distributions are paid on common units. Phantom units granted generally vest one-third per year on dates as specified in the applicable award agreements subject to continued service through the applicable vesting date. During the year ended December 31, 2018, 53,091 phantom units vested with a weighted average grant date fair value per unit of $11.24.

~~Phantom~~Pursuant ~~units are notional units that entitle the grantee~~ to ~~receive common units upon~~ the ~~vesting~~Merger, ofall ~~such~~outstanding phantom units ~~or,~~previously atgranted ~~the~~under ~~discretion of~~ the ~~Plan~~2017 ~~Administrator,~~and ~~cash~~2006 ~~equal~~Partnership toLTIP ~~the~~were ~~fair~~converted ~~market~~into ~~value~~comparable ofawards ~~the~~based ~~underlying~~on Archrock’s common ~~units~~shares. ~~Because~~As wesuch, ~~grant~~all outstanding phantom units towere ~~non-employees~~converted, weeffective ~~are~~as ~~required~~of ~~to remeasure~~ the ~~fair~~closing ~~value~~ of ~~these~~the ~~phantom units~~Merger, ~~which~~into isArchrock ~~based~~restricted onstock ~~the fair value of our common~~ units,. ~~each~~See ~~period~~Note 10 ~~and~~(“Partners’ ~~record~~Capital”) afor ~~cumulative~~further ~~adjustment~~details of the ~~expense previously recognized~~Merger. ~~During~~Each ~~the~~Archrock ~~years~~restricted ~~ended~~stock ~~December 31,~~unit ~~2017~~will ~~and~~be ~~2016,~~subject ~~we recorded an immaterial reduction~~ to ~~SG&A expense related to~~ the ~~fair~~same ~~value remeasurement of phantom units. During the year ended December 31~~vesting, ~~2015,~~forfeiture weand ~~recorded~~other aterms ~~reduction~~and toconditions ~~SG&A~~applicable ~~expense of $0.3 million, related~~ to the ~~fair~~converted ~~value~~Partnership ~~remeasurement of~~ phantom units.

Phantom units granted under the 2017 LTIP may include nonforfeitable tandem distribution equivalent rights to receive cash distributions on unvested phantom units in the quarter in which distributions are paid on common units12. ~~Phantom units granted generally vest one-third per year on dates as specified in the applicable award agreements subject to continued service through the applicable vesting date.~~Derivatives

~~Phantom~~We ~~Units~~are exposed to market risks associated with changes in the variable interest rate of the Partnership Credit Facility. We use derivative instruments to manage our exposure to fluctuations in this variable interest rate and thereby minimize the risks and costs associated with financial activities. We do not use derivative instruments for trading or other speculative purposes.

~~The~~At ~~following~~December 31, ~~table~~2018, ~~presents~~we ~~phantom~~were ~~unit~~a ~~activity~~party ~~during~~to the ~~year~~following ~~ended~~interest ~~December 31~~rate swaps, ~~2017~~which were entered into to offset changes in expected cash flows due to fluctuations in the associated variable interest rates (in millions):

	PhantomUnits(in thousands)			WeightedAverageGrant DateFair Valueper Unit
Expiration Date		Notional Value
Phantom units outstanding, January 1, 2017	197			$	11.60
May 2019		$	100
Granted	81			16.28
May 2020		100
Vested	(104	)		14.75
March 2022		300
Canceled	(21	)		9.76
		$	500
Phantom units outstanding, December 31, 2017	153			12.19

AsThe ofcounterparties ~~December 31,~~to ~~2017,~~our wederivative ~~expect~~agreements $1are major financial institutions.2 ~~million~~We monitor the credit quality of ~~unrecognized~~these ~~compensation~~financial ~~cost~~institutions ~~related~~and todo ~~unvested~~not ~~phantom~~expect ~~units~~non-performance toby beany ~~recognized~~counterparty, ~~over~~although ~~the~~such ~~weighted~~non-~~average~~performance ~~period~~could ofhave 1a material adverse effect on us.8 ~~years~~We have no specific collateral posted for our derivative instruments.

10We have designated these interest rate swaps as cash flow hedging instruments and so any change in their fair value is recognized as a component of other comprehensive income (loss) until the hedged transaction affects earnings. ~~Derivatives~~At that time, amounts are reclassified into earnings to interest expense, net, the same statement of operations line item to which the earnings effect of the hedged item is recorded. Cash flows from derivatives designated as hedges are classified in our consolidated statements of cash flows under the same category as the cash flows from the underlying assets, liabilities or anticipated transactions unless the derivative contract contains a significant financing element; in this case, the cash settlements for these derivatives are classified as cash flows from financing activities.

We are exposed to market risks associated with changes in interest rates. We use derivative instruments to minimize the risks and costs associated with financial activities by managing our exposure to interest rate fluctuations on a portion of our debt obligations. We do not use derivative instruments for trading or other speculative purposes.

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Table of Contents

~~Interest~~We ~~Rate~~expect ~~Risk~~the hedging relationship to be highly effective as the swap terms substantially coincide with the hedged item and are expected to offset changes in expected cash flows due to fluctuations in the variable rate. Prior to adoption of ASU 2017-12, we performed quarterly calculations to determine whether the swap agreements continued to be highly effective at achieving offsetting changes in cash flows attributable to the hedged risk. Upon adoption of ASU 2017-12, we perform quarterly qualitative prospective and retrospective hedge effectiveness assessments unless facts and circumstances related to the hedging relationships change such that we can no longer assert qualitatively that the cash flow hedge relationships were and continue to be highly effective. We estimate that $3.2 million of the deferred gain attributable to interest rate swaps included in accumulated other comprehensive income (loss) at December 31, 2018 will be reclassified into earnings as interest income at then-current values during the next 12 months as the underlying hedged transactions occur.

AtIn ~~December 31,~~August 2017, we ~~were~~amended athe ~~party~~terms of $300.0 million of our interest rate swap agreements to adjust the ~~following~~fixed interest rate ~~swaps,~~and ~~which~~extend ~~were~~the ~~entered~~maturity ~~into~~dates to ~~offset~~March 2022. ~~changes~~These inamendments ~~expected~~effectively created new derivative contracts and terminated the old derivative contracts. As a result, as of the amendment date, we discontinued the original cash ~~flows~~flow ~~due~~hedge relationships on a prospective basis and designated the amended interest rate swaps under new cash flow hedge relationships based on the amended terms. The fair value of the interest rate swaps immediately prior to ~~fluctuations~~the inexecution of the amendments was a liability of $0.7 million. The associated ~~variable~~amount in accumulated other comprehensive income (loss) was amortized into interest ~~rates:~~expense over the original terms of the interest rate swaps through May 2018.

Expiration Date	Notional Value (in millions)
May 2019	$	100
May 2020	100
March 2022	300
	$	500

As of December 31, 2018, the weighted average effective fixed interest rate on our interest rate swaps was 1.8%.

AsThe offollowing ~~December 31,~~table ~~2017,~~presents the ~~weighted~~effect ~~average~~of ~~effective fixed interest rate on~~ our ~~interest~~derivative ~~rate~~instruments ~~swaps was 1.8%. We have~~ designated ~~these interest rate swaps~~ as cash flow hedging instruments so that any change in their fair values is recognized as a component of comprehensive income (loss) and is included in accumulated other comprehensive income (loss) to the extent the hedge is effective. As the swap terms substantially coincide with the hedged item and are expected to offset changes in expected cash flows due to fluctuations in the variable rate, we currently do not expect a significant amount of ineffectiveness on these hedges. We perform quarterly calculations to determine whether the swap agreements are still effective and to calculate any ineffectiveness. We recorded $0.6 million of interest expense, an immaterial amount of interest income and $0.4 million of interest income during the years ended December 31, 2017, 2016 and 2015, respectively, due to ineffectiveness related to interest rate swaps. We estimate that $0.5 million of deferred gain attributable to interest rate swaps and included in our ~~accumulated~~consolidated ~~other~~balance ~~comprehensive~~sheets ~~income~~ (loss) at December 31, 2017, will be reclassified into earnings as interest income at then-current values during the next twelve months as the underlying hedged transactions occur. Cash flows from derivatives designated as hedges are classified in our condensed consolidated statements of cash flows under the same category as the cash flows from the underlying assets, liabilities or anticipated transactions, unless the derivative contract contains a significant financing element; in this case, the cash settlements for these derivatives are classified as cash flows from financing activities in our condensed consolidated statements of cash flows.thousands):

In August 2017, the Partnership amended the terms of certain of its interest rate swap agreements, designated as cash flow hedges against the variability of future interest payments due under the Credit Facility, with a notional value of $300.0 million. The amended terms adjusted the fixed interest rate and extended the maturity dates to March 2022. These amendments effectively created new derivative contracts and terminated the old derivative contracts. As a result, as of the amendment date we discontinued the original cash flow hedge relationships on a prospective basis, and designated the amended interest rate swaps under new cash flow hedge relationships based on the amended terms. The fair value of the interest rate swaps immediately prior to the execution of the amendments was a liability of $0.7 million. The associated amount in accumulated other comprehensive income (loss) is being amortized into interest expense over the original terms of the interest rate swaps through May 2018.



	Fair Value Asset (Liability)
	December 31, 2018		December 31, 2017
Derivative asset - current	$	3,185	$	186
Other long-term assets	4,122		4,490
Derivative liability - current	—		(134		)
	$	7,307

Filing Compare · Archrock Partners, L.P.