ASTM D3588-98(2003) Standard Practice for Calculating Heat Value, Compressibility Factor, and Relative Density of Gaseous Fuels
ISO 12213-2:2006 Natural gas - Calculation of compression factor - Part 2: Calculation using molar-composition analysis
ISO 12213-3:2006 Natural gas - Calculation of compression factor - Part 3: Calculation using physical properties
ISO 13443:1996 Natural gas - Standard reference conditions
ISO 15403-1:2006 Natural gas - Natural gas for use as a compressed fuel for vehicles - Part 1: Designation of the quality
ISO 15971:2008 Natural gas - Measurement of properties - Calorific value and Wobbe index
ISO 20765-1:2005 Natural gas - Calculation of thermodynamic properties - Part 1: Gas phase properties for transmission and distribution applications
ISO 20765-2:2015 Natural gas - Calculation of thermodynamic properties - Part 2: Single-phase properties (gas, liquid, and dense fluid) for extended ranges of application
ISO 6974-1:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition
ISO 6974-2:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations
ISO 6976:1995 Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition
ISO 6976:2016 Natural gas - Calculation of calorific values, density, relative density and Wobbe indices from composition
BS PD ISO/TR 29922:2017 history
2017BS PD ISO/TR 29922:2017 Natural gas. Supporting information on the calculation of physical properties according to ISO 6976