ISO 20765-5:2022
Natural gas — Calculation of thermodynamic properties — Part 5: Calculation of viscosity, Joule-Thomson coefficient, and isentropic exponent
This document specifies methods to calculate (dynamic) viscosity, Joule-Thomson coefficient, isentropic exponent, and speed of sound, excluding density, for use in the metering of natural gas flow.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Background
5 Viscosity, η
5.1 Viscosity as a function of temperature, pressure, and composition
5.2 Viscosity as a function of temperature and mass density
6 Other properties
6.1 Preamble
6.2 Joule-Thomson coefficient, μ
6.3 Isentropic exponent, κ
6.4 Speed of sound, W
7 Example calculations
8 Conclusions
9 Reporting of results
Annex A (informative) Symbols and units
Annex B (informative) Example LBC viscosity function
Annex C (informative) Example routine to convert CV, RD, and CO2 mole fraction to an equivalent C1-C3-N2-CO2 mixture
Annex D (informative) Viscosity of methane
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Background
5 Viscosity, η
5.1 Viscosity as a function of temperature, pressure, and composition
5.2 Viscosity as a function of temperature and mass density
6 Other properties
6.1 Preamble
6.2 Joule-Thomson coefficient, μ
6.3 Isentropic exponent, κ
6.4 Speed of sound, W
7 Example calculations
8 Conclusions
9 Reporting of results
Annex A (informative) Symbols and units
Annex B (informative) Example LBC viscosity function
Annex C (informative) Example routine to convert CV, RD, and CO2 mole fraction to an equivalent C1-C3-N2-CO2 mixture
Annex D (informative) Viscosity of methane
Bibliography