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BS EN ISO 5167-4:2022

BS EN ISO 5167-4:2022

$167.15

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full – Venturi tubes (ISO 5167-4:2022)

Published By Publication Date Number of Pages
BSI 2022 36
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
10 3 Terms and definitions
4 Principles of the method of measurement and computation
5 Classical Venturi tubes
5.1 Field of application
5.1.1 General
11 5.1.2 Classical Venturi tube with an “as cast” convergent section
5.1.3 Classical Venturi tube with a machined convergent section
5.1.4 Classical Venturi tube with a fabricated convergent section
5.2 General shape
5.2.1 General
5.2.2 Entrance cylinder
12 5.2.3 Convergent section
5.2.4 Throat
13 5.2.5 Divergent section
5.2.6 Truncated Venturi tube
5.2.7 Roughness
5.2.8 Classical Venturi tube with an “as cast” convergent section
14 5.2.9 Classical Venturi tube with a machined convergent section
5.2.10 Classical Venturi tube with a fabricated convergent section
15 5.3 Material and manufacture
5.4 Pressure tappings
16 5.5 Discharge coefficient, C
5.5.1 Limits of use
5.5.2 Discharge coefficient of the classical Venturi tube with an “as cast” convergent section
17 5.5.3 Discharge coefficient of the classical Venturi tube with a machined convergent section
5.5.4 Discharge coefficient of the classical Venturi tube with a fabricated convergent section
5.6 Expansibility [expansion] factor, ε
5.7 Uncertainty of the discharge coefficient, C
5.7.1 Classical Venturi tube with an “as cast” convergent section
5.7.2 Classical Venturi tube with a machined convergent section
18 5.7.3 Classical Venturi tube with a fabricated convergent section
5.8 Uncertainty of the expansibility [expansion] factor, ε
5.9 Pressure loss
5.9.1 Definition of the pressure loss
5.9.2 Relative pressure loss
19 6 Installation requirements
6.1 General
20 6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the Venturi tube
24 6.3 Flow conditioners
6.4 Additional specific installation requirements for classical Venturi tubes
6.4.1 Circularity and cylindricality of the pipe and alignment of the classical Venturi tube
25 6.4.2 Roughness of the upstream pipe
7 Flow calibration of Venturi tubes
7.1 General
7.2 Test facility
26 7.3 Meter installation
7.4 Design of the test programme
7.5 Reporting the calibration results
7.6 Uncertainty analysis of the calibration
7.6.1 General
7.6.2 Uncertainty of the test facility
27 7.6.3 Uncertainty of the Venturi tube
28 Annex A (informative) Table of expansibility [expansion] factor
29 Annex B (informative) Classical Venturi tubes used outside the scope of ISO 5167-4
32 Annex C (informative) Pressure loss in a classical Venturi tube
34 Bibliography

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BS EN ISO 5167-4:2022
$167.15