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API (American Petroleum Institute) is a leader in the development of petroleum and petrochemical equipment and operating standards covering topics that range from drill bits to environmental protection. These embrace proven, sound engineering and operating practices and safe, interchangeable equipment and materials. Many have been incorporated into state and federal regulations and adopted by ISO for worldwide acceptance.
Errata to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.9.2020
Selected format:Errata 4 to Specification for Wellhead and Tree Equipment
Adjunct of the standard published on 1.9.2021
Selected format:Errata 5 to Specification for Wellhead and Tree Equipment
Adjunct of the standard published on 1.5.2024
Selected format:Errata 6 to Specification for Wellhead and Tree Equipment
Adjunct of the standard published on 1.10.2024
Selected format:Age-hardened Nickel-based Alloys for Oil and Gas Drilling and Production Equipment, Second Edition
Standard published on 1.1.2025
Selected format:Technical Report on Capabilities of API Flanges Under Combinations of Load, Third Edition, Includes Errata (March 2017)
Standard published on 1.9.2008
Selected format:Errata to Technical Report on Capabilities of API Flanges Under Combinations of Load, Third Edition
Adjunct of the standard published on 31.3.2017
Selected format:Technical Report on Temperature Derating of API Flanges Under Combination of Loading
Standard published on 1.11.1998
Selected format:Technical Report on Capabilities of API Integral Flanges under Combination of Loading-Phase II, Fifth Edition, Includes Errata (November 2017)
Standard published on 1.4.2013
Selected format:Errata to Technical Report on Capabilities of API Integral Flanges under Combination of Loading-Phase II, Fifth Edition
Adjunct of the standard published on 1.11.2018
Selected format:Latest update: 2026-03-13 (Number of items: 2 266 261)
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