NF EN ISO 20765-1

NF EN ISO 20765-1

September 2018
Standard Current

Natural gas - Calculation of thermodynamic properties - Part 1 : gas phase properties for transmission and distribution applications

This part of ISO 20765 specifies a method of calculation for the volumetric and caloric properties of natural gases, natural gases containing synthetic admixture and similar mixtures, at conditions where the mixture can exist only as a gas.The method is applicable to pipeline-quality gases within the ranges of pressure and temperature at which transmission and distribution operations normally take place. For volumetric properties (compression factor and density), the uncertainty of calculation is about ± 0,1 % (95 % confidence interval). For caloric properties (for example enthalpy, heat capacity, Joule-Thomson coefficient, speed of sound), the uncertainty of calculation is usually greater.

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Main informations

Collections

National standards and national normative documents

Publication date

September 2018

Number of pages

56 p.

Reference

NF EN ISO 20765-1

ICS Codes

75.060   Natural gas

Classification index

X20-543-1

Print number

1

International kinship

ISO 20765-1:2005

European kinship

EN ISO 20765-1:2018
Sumary
Natural gas - Calculation of thermodynamic properties - Part 1 : gas phase properties for transmission and distribution applications

This part of ISO 20765 specifies a method of calculation for the volumetric and caloric properties of natural gases, natural gases containing synthetic admixture and similar mixtures, at conditions where the mixture can exist only as a gas.

The method is applicable to pipeline-quality gases within the ranges of pressure and temperature at which transmission and distribution operations normally take place. For volumetric properties (compression factor and density), the uncertainty of calculation is about ± 0,1 % (95 % confidence interval). For caloric properties (for example enthalpy, heat capacity, Joule-Thomson coefficient, speed of sound), the uncertainty of calculation is usually greater.

Replaced standards (1)
NF ISO 20765-1
October 2014
Standard Cancelled
Natural gas - Calculation of thermodynamic properties - Part 1 : gas phase properties used in transmission and distribution applications

This part of ISO 20765 specifies a method of calculation for the volumetric and caloric properties of natural gases, natural gases containing synthetic admixture and similar mixtures, at conditions where the mixture can exist only as a gas. The method is applicable to pipeline-quality gases within the ranges of pressure and temperature at which transmission and distribution operations normally take place. For volumetric properties (compression factor and density), the uncertainty of calculation is about ± 0,1 % (95 % confidence interval). For caloric properties (for example enthalpy, heat capacity, Joule-Thomson coefficient, speed of sound), the uncertainty of calculation is usually greater.

Table of contents
  • 1 Domaine d'application
  • 2 Références normatives
  • 3 Termes et définitions
  • 4 Base thermodynamique de la méthode
  • 5 Méthode de calcul
  • 6 Plages d'application
  • 7 Incertitude
  • 8 Consignation des résultats dans un rapport
  • Annexe A Symboles et unités
  • Annexe B Énergie libre de Helmholtz du gaz parfait
  • Annexe C Équation de l'énergie libre de Helmholtz
  • Annexe D Documentation détaillée de l'équation d'état
  • Annexe E Attribution des constituants à l'état de traces
  • Annexe F Application de la méthode
  • Annexe G Exemples
  • Bibliographie
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