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Since 1924, the American Petroleum Institute has been a cornerstone in establishing and maintaining standards for the worldwide oil and natural gas industry. Our work helps the industry invent and manufacture superior products consistently, provide critical services, ensure fairness in the marketplace for businesses and consumers alike, and promotes the acceptance of products and practices globally.

Standards enhance the safety of industry operations, assure quality, help keep costs down, reduce waste, and minimize confusion. They help speed acceptance, bring products to market quicker, and avoid having to reinvent the wheel every time a product is manufactured.

To see our recently published documents, addenda and erratas please click here. 

Important Standards Announcements

API Specification 5L

We are pleased to announce the publication of the 46th edition of Specification 5L, Line Pipe. This new edition provides technical updates that have reached consensus within API’s Subcommittee on Tubular Goods and will now give industry consistent practices in these respective areas of the standard.  These updates are reflective of API’s standards program mission to provide a forum for development of consensus-based industry standards, and technical cooperation to improve the industry’s safety performance and competitiveness.

Purchase API Standards & Software

Visit the API Publications Store to purchase copies of our standards. Our standards are designed to assist industry professionals improve the efficiency and cost-effectiveness of their operations, comply with legislative and regulatory requirements, safeguard health, and protect the environment.

Standards Inquiries

API receives numerous inquiries related to its standards, specifications, recommended practices, technical reports and codes (i.e. documents).

Standards Committees

API’s Standards Committees are made up of subcommittees and task groups comprised of industry experts who develop API standards. See a list of all open ballots.

Downstream Committees

Midstream Committees

Upstream Committees

Program Information

Information on the API Standards Program

Annual Standards Plan

Each year, API updates current standards, creates new standards and adopts existing standards.

Addenda & Errata

Addenda (amendments) and errata for published API standards are available via the API Publications Store.

Educational Outreach

API Global Webcasts and Engineering Partnership Program

Policies & Procedures

API Standards Policy and Procedure Documents


Rights and Usage Policy

The Intellectual Property (IP) Rights and Usage Policy provides information on API's copyrights and trademarks, and outlines the process of requesting to reproduce API-copyrighted material.