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eLibrary > BS EN ISO 5167-4:2022 - TC Tracked changes. Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Venturi tubes (ISO 5167-4:2022) >

BS EN ISO 5167-4:2022 - TC Tracked changes. Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Venturi tubes (ISO 5167-4:2022), 2022

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BS EN ISO 5167-4:2022 - TC Tracked changes. Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Venturi tubes (ISO 5167-4:2022), 2022

30422710.pdf [Go to Page]
undefined
European foreword
Endorsement notice [Go to Page]
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of the method of measurement and computation
5 Classical Venturi tubes [Go to Page]
5.1 Field of application [Go to Page]
5.1.1 General
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 [Go to Page]
5.2.1 General
5.2.2 Entrance cylinder
5.2.3 Convergent section
5.2.4 Throat
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
5.2.9 Classical Venturi tube with a machined convergent section
5.2.10 Classical Venturi tube with a fabricated convergent section
5.3 Material and manufacture
5.4 Pressure tappings
5.5 Discharge coefficient, C [Go to Page]
5.5.1 Limits of use
5.5.2 Discharge coefficient of the classical Venturi tube with an “as cast” convergent section
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 [Go to Page]
5.7.1 Classical Venturi tube with an “as cast” convergent section
5.7.2 Classical Venturi tube with a machined convergent section
5.7.3 Classical Venturi tube with a fabricated convergent section
5.8 Uncertainty of the expansibility [expansion] factor, ε
5.9 Pressure loss [Go to Page]
5.9.1 Definition of the pressure loss
5.9.2 Relative pressure loss
6 Installation requirements [Go to Page]
6.1 General
6.2 Minimum upstream and downstream straight lengths for installation between various fittings and the Venturi tube
6.3 Flow conditioners
6.4 Additional specific installation requirements for classical Venturi tubes [Go to Page]
6.4.1 Circularity and cylindricality of the pipe and alignment of the classical Venturi tube
6.4.2 Roughness of the upstream pipe
7 Flow calibration of Venturi tubes [Go to Page]
7.1 General
7.2 Test facility
7.3 Meter installation
7.4 Design of the test programme
7.5 Reporting the calibration results
7.6 Uncertainty analysis of the calibration [Go to Page]
7.6.1 General
7.6.2 Uncertainty of the test facility
7.6.3 Uncertainty of the Venturi tube
Annex A (informative) Table of expansibility [expansion] factor
Annex B (informative) Classical Venturi tubes used outside the scope of ISO 5167-4
Annex C (informative) Pressure loss in a classical Venturi tube
Bibliography [Go to Page]

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BS EN ISO 5167-4:2022 - TC Tracked changes. Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Venturi tubes (ISO 5167-4:2022), 2022

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