NS EN ISO 12213-3 : 2009

1 Scope
2 Normative references
3 Definitions
4 Method of calculation
  4.1 Principle
  4.2 The SGERG-88 equation
  4.3 Input variables
  4.4 Ranges of application
  4.5 Uncertainty
5 Suppliers of computer programmes
Annex A (normative) Symbols and units
Annex B (normative) Description of the SGERG-88 method
Annex C (normative) Example calculations
Annex D (normative) Conversion factors
Annex E (informative) Performance over wider ranges of application
Annex F (informative) Subroutine SGERG.FOR in Fortran
Annex G (informative) Bibliography

Defines 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.