GPA STD 2172-1996 Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis (API MPMS 14.5)
2014GPA STD 2172-2014 Calculation of Gross Heating Value@ Relative Density@ Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer (Third Edition)
2009GPA STD 2172-2009 Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer (Third Edition)
1996GPA STD 2172-1996 Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis (API MPMS 14.5)