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SLOVENSKI STANDARD
01-september-2022
Zemeljski plin - Izračun termodinamičnih lastnosti - 5. del: Izračun viskoznosti,
Joule-Thomsonovega koeficienta in isentropnega eksponenta (ISO 20765-5:2022)
Natural gas - Calculation of thermodynamic properties - Part 5: Calculation of viscosity,
Joule-Thomson coefficient, and isentropic exponent (ISO 20765-5:2022)
Erdgas - Berechnung der thermodynamischen Eigenschaften - Teil 5: Berechnung der
Viskosität, Joule-Thomson-Koeffizient und Isentropenexponent (ISO 20765-5:2022)
Gaz naturel - Calcul des propriétés thermodynamiques - Partie 5: Calcul de la viscosité,
du coefficient de Joule-Thomson et de l'exposant isentropique (ISO 20765-5:2022)
Ta slovenski standard je istoveten z: EN ISO 20765-5:2022
ICS:
75.060 Zemeljski plin Natural gas
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 20765-5
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 75.060
English Version
Natural gas - Calculation of thermodynamic properties -
Part 5: Calculation of viscosity, Joule-Thomson coefficient,
and isentropic exponent (ISO 20765-5:2022)
Gaz naturel - Calcul des propriétés thermodynamiques Erdgas - Berechnung der thermodynamischen
- Partie 5: Calcul de la viscosité, du coefficient de Joule- Eigenschaften - Teil 5: Berechnung der Viskosität,
Thomson et de l'exposant isentropique (ISO 20765- Joule-Thomson-Koeffizient und Isentropenexponent
5:2022) (ISO 20765-5:2022)
This European Standard was approved by CEN on 3 April 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20765-5:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 20765-5:2022) has been prepared by Technical Committee ISO/TC 193
"Natural gas" in collaboration with Technical Committee CEN/TC 238 “Test gases, test pressures,
appliance categories and gas appliance types” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2022, and conflicting national standards
shall be withdrawn at the latest by November 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20765-5:2022 has been approved by CEN as EN ISO 20765-5:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 20765-5
First edition
2022-04
Natural gas — Calculation of
thermodynamic properties —
Part 5:
Calculation of viscosity, Joule-
Thomson coefficient, and isentropic
exponent
Gaz naturel — Calcul des propriétés thermodynamiques —
Partie 5: Calcul de la viscosité, du coefficient de Joule-Thomson et de
l'exposant isentropique
Reference number
ISO 20765-5:2022(E)
ISO 20765-5:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
ii
ISO 20765-5:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Background . 1
5 Viscosity, η . . 3
5.1 Viscosity as a function of temperature, pressure, and composition . 3
5.2 Viscosity as a function of temperature and mass density . 6
6 Other properties . 6
6.1 Preamble . 6
6.2 Joule-Thomson coefficient, μ . 8
6.3 Isentropic exponent, κ . 9
6.4 Speed of sound, W . 10
7 Example calculations .10
8 Conclusions .11
9 Reporting of results .11
Annex A (informative) Symbols and units .12
Annex B (informative) Example LBC viscosity function .13
Annex C (informative) Example routine to convert CV, RD, and CO mole fraction to an
equivalent C -C -N -CO mixture .15
1 3 2 2
Annex D (informative) Viscosity of methane .16
Bibliography .17
iii
ISO 20765-5:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1,
Analysis of natural gas, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 238, Test gases, test pressures and categories of appliances, in accordance
with the agreement on technical cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 20765 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 20765-5:2022(E)
Introduction
This document gives simplified methods for the calculation of (dynamic) viscosity, Joule-Thomson
coefficient, and isentropic exponent for use in natural gas calculations in the temperature range −20 °C
to 40 °C, with absolute pressures up to 10 MPa, and only within the gas phase. For the Joule-Thomson
coefficient and isentropic exponent, the uncertainty of the formulae provided is greater than that
[1]
obtained from a complete equation of state such as GERG-2008 (see ISO 20765-2) but is considered to
be fit for purpose. The formulae given here are very simple.
v
INTERNATIONAL STANDARD ISO 20765-5:2022(E)
Natural gas — Calculation of thermodynamic properties —
Part 5:
Calculation of viscosity, Joule-Thomson coefficient
...