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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.
Statistical Aspects of Measuring and Sampling: Statistical Concepts and Procedures in Measurement, First Edition, Includes Errata (July 2013)
Standard published on 1.6.1985
Selected format:Statistical Aspects of Measuring and Sampling Section 2 - Methods of Evaluating Meter Proving Data, Second Edition
Standard published on 1.4.2018
Selected format:Manual of Petroleum Measurement Standards, Measurement Uncertainty, Second Edition
Standard published on 30.11.2017
Selected format:Drilling Fluids Materials, Nineteenth Edition, Includes Addendum 1 (2020), Addendum 2 (2022), and Errata 1 (2024)
Standard published on 1.10.2019
Selected format:Addendum to Drilling Fluids Materials, Nineteenth Edition
Adjunct of the standard published on 1.4.2020
Selected format:Addendum to Drilling Fluids Materials, Nineteenth Edition
Adjunct of the standard published on 1.6.2022
Selected format:Errata to Drilling Fluids Materials, Nineteenth Edition
Adjunct of the standard published on 1.2.2024
Selected format:Field Testing Water-based Drilling Fluids, Fifth Edition, Includes Errata 1 (2020), Errata 2 (2021), and Errata 3 (2023)
Standard published on 30.4.2019
Selected format:Errata to Field Testing Water-based Drilling Fluids, Fifth Edition
Adjunct of the standard published on 1.5.2020
Selected format:Errata to Field Testing Water-based Drilling Fluids, Fifth Edition
Adjunct of the standard published on 1.12.2021
Selected format:Latest update: 2025-12-18 (Number of items: 2 252 678)
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