EN ISO 12213-2:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Method of calculation
  4.1 Principle
  4.2 The AGA8-92DC equation
  4.3 Input variables
  4.4 Ranges of application
  4.5 Uncertainty
5 Computer program
Annex A (normative) - Symbols and units
Annex B (normative) - Description of the AGA8-92DC method
Annex C (normative) - Example calculations
Annex D (normative) - Pressure and temperature conversion
                      factors
Annex E (informative) - Performance over wider ranges of
                        application
Annex F (informative) - Subroutines in Fortran for the
                        AGA8-92DC method
Bibliography

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.It is divided into three parts: this part, ISO 12213-2:2006, specifies a method for the calculation of compression factors when the detailed composition of the gas by mole fractions is known, together with the relevant pressures and temperatures.The method is applicable to pipeline quality gases within the ranges of pressure p and temperature T at which transmission and distribution operations normally take place, with an uncertainty of about +/- 0,1 %. It can be applied, with greater uncertainty, to wider ranges of gas composition, pressure and temperature.