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ISO 5167-4:2022

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 4: Venturi tubes

Edition date: 2022-06-16
In Force
Available languages: French, English
Summary:

This document specifies the geometry and method of use (installation and operating conditions) of Venturi tubes[1] when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.

This document also provides background information for calculating the flow rate and is applicable in conjunction with the requirements given in ISO 5167-1.

This document is applicable only to Venturi tubes in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, Venturi tubes can only be used uncalibrated in accordance with this standard within specified limits of pipe size, roughness, diameter ratio and Reynolds number, or alternatively they can be used across their calibrated range. This document is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated Venturi tubes in pipes sized less than 50 mm or more than 1 200 mm, or where the pipe Reynolds numbers are below 2 × 105.

This document deals with the three types of classical Venturi tubes:

a) “as cast”;

b) machined;

c) fabricated (also known as “rough-welded sheet-iron”).

A Venturi tube consists of a convergent inlet connected to a cylindrical throat which is in turn connected to a conical expanding section called the divergent section (or alternatively the diffuser). Venturi nozzles (and other nozzles) are dealt with in ISO 5167-3.

NOTE       In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube.

 

[1]   In the USA the classical Venturi tube is sometimes called the Herschel Venturi tube.



Le présent document spécifie la géométrie et le mode d’emploi (conditions d’installation et d’utilisation) de tubes de Venturi[1] insérés dans une conduite en charge dans le but de déterminer le débit du fluide s’écoulant dans cette conduite.

Le présent document fournit également des informations de fond nécessaires au calcul de ce débit, et il convient de l’utiliser conjointement avec les exigences stipulées dans l’ISO 5167‑1.

Le présent document est applicable uniquement aux tubes de Venturi dans lesquels l’écoulement reste subsonique dans tout le tronçon de mesure et où le fluide peut être considéré comme monophasique. De plus, les tubes de Venturi peuvent uniquement être utilisés à l’état non étalonné, conformément à la présente norme, dans les limites spécifiées de diamètre de conduite, de rugosité, de rapport des diamètres et de nombre de Reynolds, ou dans leur gamme étalonnée. Le présent document n’est pas applicable au mesurage d’un écoulement pulsé. Il ne couvre pas l’utilisation de tubes de Venturi non étalonnés dans des conduites de diamètre inférieur à 50 mm ou supérieur à 1 200 mm, ni les cas où les nombres de Reynolds rapportés à la conduite sont inférieurs à 2 × 105.

Le présent document traite de trois types de tubes de Venturi classiques:

a) «brut de fonderie»;

b) usiné;

c) manufacturé (également nommé «en tôle soudée brute»).

Un tube de Venturi se compose d’un convergent d’entrée, relié à un col cylindrique qui est, à son tour, relié à un évasement de forme tronconique appelé «divergent» (ou encore diffuseur). Les Venturi-tuyères (et d’autres tuyères) font l’objet de l’ISO 5167‑3.

NOTE            Aux États-Unis, le tube de Venturi classique est parfois nommé «tube de Herschel».

 

[1] Aux États-Unis, le tube de Venturi classique est parfois nommé «tube de Herschel».
ICS: 17.120.10-Flow in closed conduits
CTN: ISO/TC 30/SC 2 - 47592

Standards Cancellations

Anula a ISO 5167-4:2003

International Equivalence

Identic UNE-EN ISO 5167-4:2023

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