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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.
Specification for Wellhead and Tree Equipment, Twenty-First Edition, Includes Errata 1 (2019), Errata 2 (2020), Errata 3 (2020), Errata 4 (2021), Errata 5 (2024), Errata 6 (2024), Addendum 1 (2020), Addendum 2 (2021), Addendum 3 (2022), and Addendum 4 (2024)
Standard published on 31.10.2018
Selected format:Addendum to Specification for Wellhead and Tree Equipment
Adjunct of the standard published on 1.7.2020
Selected format:Addendum to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.6.2021
Selected format:Addendum 3 to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.8.2022
Selected format:Addendum 4 to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.11.2024
Selected format:Errata to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.4.2019
Selected format:Errata to Specification for Wellhead and Tree Equipment, Twenty-First Edition
Adjunct of the standard published on 1.6.2020
Selected format: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:Latest update: 2025-12-21 (Number of items: 2 252 887)
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