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BS EN ISO 5167-1:2022

BS EN ISO 5167-1:2022

$198.66

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full – General principles and requirements

Published By Publication Date Number of Pages
BSI 2022 52
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This document defines terms and symbols and establishes the general principles for methods of measurement and computation of the flow rate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles, Venturi tubes, cone meters, and wedge meters) when they are inserted into a circular cross-section conduit running full. This document also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flow rate. ISO 5167 (all parts) is applicable only to flow that remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. It is not applicable to the measurement of pulsating flow.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 3.1 Pressure measurement
3.2 Primary devices
11 3.3 Flow
14 4 Symbols and subscripts
4.1 Symbols
15 5 Principle of the method of measurement and computation
5.1 Principle of the method of measurement
16 5.2 Method of determination of the required diameter ratio for the selected standard primary device
5.3 Computation of flow rate
5.4 Determination of density, pressure and temperature
5.4.1 General
17 5.4.2 Density
5.4.3 Static pressure
5.4.4 Temperature
18 5.5 Differential pressure flow measurement system
5.5.1 General
19 5.5.2 Primary device
20 5.5.3 Impulse lines and transmitters
5.5.4 Impulse line isolation valves and valve manifolds
5.5.5 Flow computer
5.6 Differential pressure flow measurement system design considerations
5.6.1 Flow rate turndown and stacked transmitters
5.6.2 Meter calibration
21 5.6.3 Permanent pressure loss
22 5.6.4 Diagnostics and meter verification
5.6.5 Overall uncertainty of differential pressure metering system
6 General requirements for the measurements
6.1 Primary device
23 6.2 Nature of the fluid
6.3 Flow conditions
7 Installation requirements
7.1 General
25 7.2 Minimum upstream and downstream straight lengths
7.3 General requirement for flow conditions at the primary device
7.3.1 Requirement
7.3.2 Swirl-free conditions
7.3.3 Good velocity profile conditions
7.4 Flow conditioners
7.4.1 Compliance testing
28 7.4.2 Specific test
8 Uncertainties on the measurement of flow rate
8.1 General
8.2 Definition of uncertainty
29 8.3 Practical computation of the uncertainty
8.3.1 Component uncertainties
8.3.2 Practical working formula
32 Annex A (informative) Iterative computations
34 Annex B (informative) Examples of values of the pipe wall uniform equivalent roughness, ka
35 Annex C (informative) Flow conditioners and flow straighteners
37 Annex D (informative) Differential pressure transmitters, flow range and turndown
44 Annex E (informative) Example of uncertainty calculation for a differential pressure device
48 Annex F (informative) Permanent pressure loss example
50 Bibliography

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BS EN ISO 5167-1:2022
$198.66