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American Petroleum Institute

About the American Petroleum Institute

Formed in 1919 as a standards-setting organisation, the American Petroleum Institute is a leading non-profit organisation. It has led the development of petroleum, natural gas, petrochemical equipment and operational standards for over 90 years. Their mission is to promote safety across the industry globally, and to influence public policy in support of a strong, viable U.S. oil and natural gas industry. 


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API Standards drive consistency, innovation, and fairness in the industry. They ensure superior product invention and manufacturing, critical service delivery, and marketplace equity. Widely adopted globally, these standards foster acceptance by industry and governments, promoting international trade and collaboration. 

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API SPEC 6A:2018
Specification for Wellhead and Tree Equipment, Twenty-First Edition
API 620:2013+ADD 2:2018
Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Twelfth Edition, Includes Addendum 1 (2014) and Addendum 2 (2018)
API 5L:2018
API STD 2000:2014(R2020)
Venting atmospheric and low-pressure storage tanks
API STD 598:2023
Valve Inspection and Testing
API SPEC 6A:2018+ADD 3:2022
Specification for Wellhead and Tree Equipment, Twenty-First Edition
API SPEC 20E:2024
Alloy and Carbon Steel Bolting for Use in the Petroleum and Natural Gas Industries
API STD 936:2024
Refractory Installation Quality Control-Inspection and Testing Monolithic Refractory Linings and Materials
API RP 688:2023+ERR 1:2024
Pulsation and Vibration Control for Positive Displacement Machinery Systems for Petroleum, Chemical, and Natural Gas Industry Services
API RP 16Q:2017+ADD 2:2024
Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems
API RP 574:2024
Inspection Practices for Piping System Components
API 570:2024
Piping Inspection Code: In service Inspection, Rating, Repair, and Alteration of Piping Systems
API RP 5EX:2018(R2024)
Design, Verification, and Application of Solid Expandable Systems
API RP 5B1:1999(R2024)
Gauging and Inspection of Casing, Tubing, and Line Pipe Threads
API RP 5L1:2009(R2024)
Recommended Practice for Railroad Transportation of Line Pipe
API TR 1190:2024
API TR 1190:2024
API MPMS CH 20.3:2024
Measurement of Multiphase Flow
API RP 2SK:2024
Design and Analysis of Stationkeeping Systems for Floating Offshore Structures
API SPEC 13A:2019+ERR 1:2024
Drilling Fluids Materials
API TR 6RT:2020
Guidelines for Design and Manufacture of Surface Wellhead Running, Retrieving and Testing Tools, Clean-out Tools and Wear Bushings, First Edition
API STD 6DX:2020+ERR 1:2023
Standard for Actuators and Mounting Kits for Valves
API STD 20G:2020
Welding Services for Equipment Used in the Petroleum and Natural Gas Industry, First Edition
API 608:2020
Metal Ball Valves—Flanged, Threaded, and Welding Ends
API STD 12R1:2020+ADDENDUM 1:2021
Installation, Operation, Maintenance, Inspection, and Repair of Tanks in Production Service
API SPEC 7-2:2017+ADD 2:2023
Threading and Gauging of Rotary Shouldered Connections
API RP 1185:2024
Pipeline Public Engagement
API MPMS CH 22.5:2024
Testing Protocols—Flow Computational Device
API SPEC 14A:2024
Subsurface Safety Valve and Annular Safety Valve Equipment
API MPMS CH 7.4:2018(R2024)
Temperature Determination, Part 4—Dynamic Temperature Measurement
API SPEC 5ST:2010+ADD 1:2024
Coiled Tubing
API RP 535:2014(R2024)
Burners for Fired Heaters in General Refinery Services
API RP 7G-1:2023+ERR 1:2024
Drill Stem Performance Properties
API SPEC 5LD:2015+ADD 1:2024
CRA Clad or Lined Steel Pipe
API MPMS CH 9.3:2024
API MPMS CH 9.3: Standard Test Method for Density, Relative Density, and API Gravity of Crude Petroleum and Liquid Petroleum Products
API MPMS CH 8.4:2024
Standard Practice for Sampling and Handling of Fuels for Volatility Measurement
API RP 756:2024
Management of Hazards Associated with Location of Process Plant Tents
API RP 752:2024
Management of Hazards Associated with Location of Process Plant Permanent Buildings
API MPMS CH 17.11:2024
Measurement and Sampling of Liquid Hydrocarbon Cargoes Using Closed and Restricted Equipment
API RP 17Z:2024
Medium Voltage Equipment Used on Subsea Production Systems
Mechanical systems and components for general use
Energy and heat transfer engineering
Petroleum and related technologies

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Frequently Asked Questions

A standard enhances the safety of industry operations, assures quality, and helps keep costs down to reduce waste and minimise confusion.

API’s Training Certification Program provides third- party certification for a variety of oil and gas industry training courses, ensuring that any training provided meets industry standards.   

The American Petroleum Institute (API), is the principal standards body around the world for engine oil and lubricants. It is primarily responsible for developing, maintaining and promoting petroleum related standards to enhance operational and environmental safety, efficiency and sustainability.  

The American Petroleum Institute is an independent, non-governmental organisation. The API receives substantial funding from major oil conglomerates, including Royal Dutch Shell, ExxonMobil, Chevron, and BP. These companies contribute millions of dollars to API, reinforcing its power and influence. API represents over 625 members, which encompass various segments of the US oil and natural gas industry. These member companies engage in exploration, production, refining, marketing, distribution, and marine activities across the globe.

API represents all segments of America’s oil and natural gas industry. They have more than 600 members who produce, process and distribute most of the nation’s energy.  In their first 100 years, the American Petroleum Institute developed more than 800 standards to enhance operational and environmental safety, efficiency and sustainability both nationally, and in countries around the globe.

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