API MPMS 14.5 Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer
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API MPMS 14.5 Document Information:
Title
Calculation of Gross Heating Value, Relative Density, Compressibility and Theoretical Hydrocarbon Liquid Content for Natural Gas Mixtures for Custody Transfer
American Petroleum Institute
Publication Date:
Jan 1, 2009
Scope:
This standard presents procedures for calculating, at base
conditions from composition, the following properties of natural
gas mixtures: gross heating value, relative density (real and
ideal), compressibility factor and theoretical hydrocarbon liquid
content which in the U.S. is typically expressed as GPM, the
abbreviation for gallons of liquid per thousand cubic feet of
gas.
Rigorous calculation of the effect of water upon these
calculations is complicated. Because this document relates
primarily to custody transfer, the water effect included is an
acceptable contractual calculation. Annex A of this standard
contains a detailed investigation of the effect of water and
detailed derivations of the equations presented in the
standard.
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