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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.
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:Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters - Part 2: Specification and Installation Requirements, Fifth Edition, Includes Errata 1 (2017) and Errata 2 (2018)
Standard published on 1.3.2016
Selected format:Errata to MPMS Chapter 14.3 Part 2: Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters - Part 2: Specification and Installation Requirements, Fifth Edition
Adjunct of the standard published on 1.3.2017
Selected format:Errata to Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids - Concentric, Square-edged Orifice Meters - Part 2: Specification and Installation Requirements, Fifth Edition
Adjunct of the standard published on 1.1.2019
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:Natural Gas Fluids Measurement: Continuous Density Measurement
Standard published on 1.4.1991
Selected format:Mass Measurement of Natural Gas Liquids and Other Hydrocarbons, Fifth Edition
Standard published on 1.2.2018
Selected format:Natural Gas Fluids Measurement: Liquefied Petroleum Gas Measurement
Standard published on 1.7.1997
Selected format:Latest update: 2025-12-20 (Number of items: 2 252 706)
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