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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.
Recommended Practice for Gaging and Inspection of Casing, Tubing and Pipe Line Threads
Adjunct of the standard published on 1.9.2004
Selected format:Recommended Practice for Care and Use of Casing and Tubing
Standard published on 1.5.1999
Selected format:Calculating Performance Properties of Pipe Used as Casing or Tubing, Seventh Edition, Includes Addendum 1
Standard published on 1.6.2018
Selected format:Addendum to Calculating Performance Properties of Pipe Used as Casing or Tubing, Seventh Edition
Adjunct of the standard published on 1.10.2019
Selected format:Bulletin on Formulas and Calculations for Casing, Tubing, Drill Pipe, and Line Pipe Properties
Standard published on 15.4.1999
Selected format:Bulletin on Round Thread Casing Joint Strength with Combined Internal Pressure and Bending
Standard published on 31.5.1987
Selected format:Procedures for Testing Casing and Tubing Connections, Fourth Edition, Includes Addendum 1 (2021)
Standard published on 1.1.2017
Selected format:Addendum to Procedures for Testing Casing and Tubing Connections, Fourth Edition
Adjunct of the standard published on 1.5.2021
Selected format:Pipe with Welded Connectors, Third Edition
Standard published on 1.5.2018
Selected format:Recommended Practice for Coiled Tubing Operations in Oil and Gas Well Services
Standard published on 1.12.1996
Selected format:Latest update: 2025-12-22 (Number of items: 2 253 013)
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