ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural gases containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a gas.
EN ISO 12213-3:2009 history
2009EN ISO 12213-3:2009 Natural gas - Calculation of compression factor - Part 3: Calculation using physical properties (ISO 12213-3:2006)
1998EN ISO 12213-3:1998 Natural gas Calculation of compression factor Part 3: Calculation using physical properties