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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.
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:Global Emissions of Carbon Dioxide from Petroleum Sources
Standard published on 1.7.1991
Selected format:Identification of Oils that Produce non-Buoyant In Situ Burning Residues and Methods for their Recovery
Standard published on 1.2.2002
Selected format:Subsurface Safety Valve and Annular Safety Valve Equipment, Thirteenth Edition, Includes Addendum 1 (2025)
Standard published on 1.3.2024
Selected format:Addendum 1 to Subsurface Safety Valve and Annular Safety Valve Equipment, Thirteenth Edition
Adjunct of the standard published on 1.12.2025
Selected format:Latest update: 2026-03-18 (Number of items: 2 266 854)
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