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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.
Manual of Petroleum Measurement Standards Chapter 14.13 Simplified Metering System Design and Performance-based Methodology for Non-custody Gas Measurement, First Edition
Standard published on 1.10.2022
Selected format:Venturi Metering of Natural Gas and Other Related Hydrocarbon Fluids, First Edition
Standard published on 1.3.2023
Selected format:Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids—Concentric, Square-edged Orifice Meters Part 2: Specification and Installation Requirements, Sixth Edition
Standard published on 1.8.2026
Selected format:Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters, Part 4: Background, Development, Implementation Procedure, and Example Calculations, Fourth Edition, Includes Errata 1 (2024)
Standard published on 1.10.2019
Selected format:Errata 1 to Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters, Part 4: Background, Development, Implementation Procedure, and Example Calculations, Fourth Edition, Includes Errata 1 (2024)
Adjunct of the standard published on 1.5.2024
Selected format:Errata for Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters - Part 1: General Equations and Uncertainty Guidelines, Fourth Edition
Adjunct of the standard published on 1.7.2013
Selected format:Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters - Part 1: General Equations and Uncertainty Guidelines, Fourth Edition, Includes Errata, July 2013
Standard published on 1.9.2012
Selected format:Natural Gas Fluids Measurement: Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-Edged Orifice Meters - Part 3: Natural Gas Applications, Fourth Edition
Standard published on 1.11.2013
Selected format:Natural Gas Fluids Measurement - Converting Mass of Natural Gas Liquids and Vapors to Equivalent Liquid Volumes, Third Edition
Standard published on 1.8.2025
Selected format:Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures of Custody Transfer, Third Edition
Standard published on 1.1.2009
Selected format:Latest update: 2026-10-02 (Number of items: 2 304 304)
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