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EN ISO 9300:2005

(Main)

Measurement of gas flow by means of critical flow Venturi nozzles (ISO 9300:2005)

Measurement of gas flow by means of critical flow Venturi nozzles (ISO 9300:2005)

ISO 9300:2005 specifies the geometry and method of use (installation in a system and operating conditions) of critical flow Venturi nozzles (CFVN) used to determine the mass flow-rate of a gas flowing through a system. It also gives the information necessary for calculating the flow-rate and its associated uncertainty. It is applicable to Venturi nozzles in which the gas flow accelerates to the critical velocity at the throat (this being equal to the local sonic velocity), and only where there is steady flow of single-phase gases.

Durchflussmessung von Gasen mit Venturidüsen bei kritischer Strömung (ISO 9300:2005)

Diese Internationale Norm legt die geometrische Gestalt und das Verfahren für die Anwendung (Einbau in ein System und Arbeitsbedingungen) von Venturidüsen fest, die den Massendurchfluss in einem von Gas durchströmten System bei kritischer Strömung bestimmen. Sie enthält Angaben für die Berechnung des Durchflusses und der zugehörigen Unsicherheit.
Sie ist für Venturidüsen anwendbar, in deren Halsteil das Gas auf die kritische Strömungsgeschwindigkeit beschleunigt wird (dies entspricht der örtlichen Schallgeschwindigkeit) und nur für einphasige Gase bei stationärer Strömung. Bei der kritischen Geschwindigkeit hat der Massendurchfluss des durch die Venturidüse strömenden Gases, unter den auf der Einlaufseite vorhandenen Bedingungen, sein Maximum.
Die Venturidüse bei kritischer Strömung (kritische Düse), die in dieser Norm behandelt wird, kann nur innerhalb gegebener Grenzen eingesetzt werden, d. h. Grenzen für das Verhältnis Durchmesser des Halsteils zum Durchmesser des Einlaufrohres und Grenzwerte für die Reynoldszahl im Halsteil. Diese Internationale Norm beschreibt Venturidüsen, die in ausreichend häufigen Versuchen direkt kalibriert wurden, so dass aus diesen Ergebnissen für gleiche Anwendungsbedingungen Koeffizienten mit angebbaren Grenzwerten für die Unsicherheit abgeleitet werden konnten.
Sie enthält Angaben für Fälle, wo
-   die Einlaufstrecke vor der Venturidüse einen kreisförmigen Querschnitt aufweist oder
-   davon ausgegangen werden kann, dass an der Einlaufseite der Venturidüse oder an der Einlaufseite einer als Einheit zusammengefasste Gruppe von Venturidüsen ein großer Raum vorhanden ist. Die zusammengefasste Einheit eröffnet die Möglichkeit, Venturidüsen parallel einzubauen um damit größte Durchflüsse zu erzielen.
Für hochgenaue Messungen bei niedrigen Reynoldszahlen werden hochgenau bearbeitete Venturidüsen beschrieben.

Mesure de débit de gaz au moyen de Venturi-tuyères en régime critique (ISO 9300:2005)

L'ISO 9300:2005 spécifie la géométrie et le mode d'emploi (installation dans un circuit et conditions opératoires) de Venturi-tuyères en régime critique (CFVN) utilisés pour déterminer le débit-masse de gaz traversant le circuit. Elle donne également les informations nécessaires au calcul du débit et de l'incertitude associée. Elle s'applique aux Venturi-tuyères au sein desquels l'écoulement gazeux est accéléré jusqu'à atteindre la vitesse critique au col (la vitesse d'un écoulement critique est égale à la vitesse locale du son), et uniquement lorsqu'il existe un écoulement stationnaire monophasique de gaz.

Merjenje pretoka plina na podlagi kritičnega toka v Venturijevi šobi (ISO 9300:2005)

General Information

Status
Withdrawn
Publication Date
14-Aug-2005
Withdrawal Date
28-Jun-2022
ICS
17.120.10 - Flow in closed conduits
Technical Committee
CEN/SS F05 - Measuring insreuments
Drafting Committee
CEN/SS F05 - Measuring insreuments
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
29-Jun-2022
Ref Project
SIST EN ISO 9300:2005 - Measurement of gas flow by means of critical flow Venturi nozzles (ISO 9300:2005)

Relations

Replaces
EN ISO 9300:1995 - Measurement of gas flow by means of critical flow Venturi nozzles (ISO 9300:1990)
Effective Date
22-Dec-2008
Replaced By
EN ISO 9300:2022 - Measurement of gas flow by means of critical flow nozzles (ISO 9300:2022)
Effective Date
11-Dec-2018

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SLOVENSKI STANDARD
SIST EN ISO 9300:2005
01-november-2005
1DGRPHãþD
SIST EN ISO 9300:1998
0HUMHQMHSUHWRNDSOLQDQDSRGODJLNULWLþQHJDWRNDY9HQWXULMHYLãREL ,62

Measurement of gas flow by means of critical flow Venturi nozzles (ISO 9300:2005)
Durchflussmessung von Gasen mit Venturidüsen bei kritischer Strömung (ISO
9300:2005)
Mesure de débit de gaz au moyen de Venturi-tuyeres en régime critique (ISO
9300:2005)
Ta slovenski standard je istoveten z: EN ISO 9300:2005
ICS:
17.120.10 Pretok v zaprtih vodih Flow in closed conduits
SIST EN ISO 9300:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9300:2005

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SIST EN ISO 9300:2005
EUROPEAN STANDARD
EN ISO 9300
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2005
ICS 17.120.10 Supersedes EN ISO 9300:1995
English Version
Measurement of gas flow by means of critical flow Venturi
nozzles (ISO 9300:2005)
Mesure de débit de gaz au moyen de Venturi-tuyères en Durchflussmessung von Gasen mit Venturidüsen bei
régime critique (ISO 9300:2005) kritischer Strömung (ISO 9300:2005)
This European Standard was approved by CEN on 15 July 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 9300:2005: E
worldwide for CEN national Members.

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SIST EN ISO 9300:2005

EN ISO 9300:2005 (E)





Foreword


This document (EN ISO 9300:2005) has been prepared by Technical Committee ISO/TC 30
"Measurement of fluid flow in closed conduits" in collaboration with CMC.

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 February 2006, and conflicting national
standards shall be withdrawn at the latest by February 2006.

This document supersedes EN ISO 9300:1995.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 9300:2005 has been approved by CEN as EN ISO 9300:2005 without any
modifications.

2

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SIST EN ISO 9300:2005


INTERNATIONAL ISO
STANDARD 9300
Second edition
2005-08-15

Measurement of gas flow by means of
critical flow Venturi nozzles
Mesure de débit de gaz au moyen de Venturi-tuyères en régime
critique




Reference number
ISO 9300:2005(E)
©
ISO 2005

---------------------- Page: 5 ----------------------

SIST EN ISO 9300:2005
ISO 9300:2005(E)
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[2] The long radius nozzle differs from the ISA 1932 nozzle in shape and in the position of the pressure tappings.

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