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SLOVENSKI STANDARD
01-september-2022
Nadomešča:
SIST EN ISO 9300:2005
Merjenje pretoka plina na podlagi kritičnega toka v Venturijevi šobi (ISO 9300:2022)
Measurement of gas flow by means of critical flow nozzles (ISO 9300:2022)
Durchflussmessung von Gasen mit Venturidüsen bei kritischer Strömung (ISO
9300:2022)
Mesurage de débit de gaz au moyen de tuyères en régime critique (ISO 9300:2022)
Ta slovenski standard je istoveten z: EN ISO 9300:2022
ICS:
17.120.10 Pretok v zaprtih vodih Flow in closed conduits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 9300
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2022
EUROPÄISCHE NORM
ICS 17.120.10 Supersedes EN ISO 9300:2005
English Version
Measurement of gas flow by means of critical flow nozzles
(ISO 9300:2022)
Mesurage de débit de gaz au moyen de tuyères en Durchflussmessung von Gasen mit Venturidüsen bei
régime critique (ISO 9300:2022) kritischer Strömung (ISO 9300:2022)
This European Standard was approved by CEN on 17 June 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 9300:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 9300:2022) has been prepared by Technical Committee ISO/TC 30
"Measurement of fluid flow in closed conduits" in collaboration with CCMC.
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 December 2022, and conflicting national standards
shall be withdrawn at the latest by December 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.
This document supersedes EN ISO 9300:2005.
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 9300:2022 has been approved by CEN as EN ISO 9300:2022 without any modification.
INTERNATIONAL ISO
STANDARD 9300
Third edition
2022-06
Measurement of gas flow by means of
critical flow nozzles
Mesurage de débit de gaz au moyen de tuyères en régime critique
Reference number
ISO 9300:2022(E)
ISO 9300:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 9300:2022(E)
Contents Page
Foreword . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 Pressure . 1
3.2 Temperature . 2
3.3 Nozzle . 2
3.4 Flow . 3
3.5 Flow rate . 4
3.6 Gas . 5
4 Symbols and abbreviations . 6
5 Basic equations . 9
5.1 Gas behaviour . 9
5.1.1 Isentropic process . 9
5.1.2 State equation . 9
5.2 Isentropic flow of a perfect gas . 9
5.2.1 Flowing area . 9
5.2.2 Static pressure . 9
5.2.3 Static temperature . 10
5.3 Theoretical variables at the critical point . 10
5.3.1 General . 10
5.3.2 Critical pressure . 10
5.3.3 Critical temperature . 10
5.3.4 Critical density . 10
5.3.5 Critical velocity . 10
5.4 Theoretical mass flow rates . 10
5.4.1 General . 10
5.4.2 Theoretical mass flow rate of a perfect gas . 10
5.4.3 Theoretical mass flow rate of real gas . 11
5.5 Mass flow rate . 11
6 General requirements . 11
7 Applications for which the method is suitable . 12
8 CFN . 12
8.1 General requirements for both the standard CFN types . 12
8.1.1 General . 12
8.1.2 Materials . 12
8.1.3 Contraction and throat . 13
8.1.4 Diffuser . 13
8.2 Requirements for each standard types of CFN . 14
8.2.1 Standard CFNs . Error! Bookmark not defined.
8.2.2 Toroidal-throat CFN . 15
8.2.3 Cylindrical-throat CFN . 16
9 Installation requirements . 18
9.1 General requirements for both the standard configurations . 18
9.1.1 Standard configurations . 18
9.1.2 Upstream pressure tapping . 18
9.1.3 Downstream pressure tapping . 19
ISO 9300:2022(E)
9.1.4 Temperature measurement . 19
9.1.5 Density measurement . 20
9.1.6 Drain hole . 20
9.1.7 Downstream condition . 20
9.2 Pipe configuration . 21
9.2.1 General . 21
9.2.2 Upstream pipe . 21
9.2.3 Pressure measurement .
...