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BS EN ISO 5167-5:2022

BS EN ISO 5167-5:2022

$142.49

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full – Cone meters

Published By Publication Date Number of Pages
BSI 2022 24
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This document specifies the geometry and method of use (installation and operating conditions) of cone meters when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit. As the uncertainty of an uncalibrated cone meter might be too high for a particular application, it might be deemed essential to calibrate the flow meter in accordance with Clause 7. 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 cone meters in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. Uncalibrated cone meters can only be used within specified limits of pipe size, roughness, ?, and Reynolds number, Re. This document is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated cone meters in pipes sized less than 50 mm or more than 500 mm, or where the pipe Reynolds numbers are below 8 × 104 or greater than 1,2 × 107. A cone meter is a primary device which consists of a cone-shaped restriction held concentrically in the centre of the pipe with the nose of the cone upstream. The design of cone meter defined in this document has one or more upstream pressure tappings in the wall, and a downstream pressure tapping positioned in the back face of the cone with the connection to a differential pressure transmitter being a hole through the cone to the support bar, and then up through the support bar. Alternative designs of cone meters are available; however, at the time of writing, there is insufficient data to fully characterize these devices, and therefore, these meters shall be calibrated in accordance with Clause 7.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
10 4 Principles of the method of measurement and computation
11 5 Cone meters
5.1 Field of application
5.2 General shape
15 5.3 Material and manufacture
16 5.4 Pressure tappings
5.5 Discharge coefficient, C
5.5.1 Limits of use
5.5.2 Discharge coefficient of the cone meter
17 5.6 Expansibility (expansion) factor, ε
5.7 Uncertainty of the discharge coefficient, C
5.8 Uncertainty of the expansibility (expansion) factor, ε
5.9 Pressure loss
18 6 Installation requirements
6.1 General
6.2 Minimum upstream and downstream straight lengths for installations between various fittings and the cone meter
6.2.1 General
19 6.2.2 Single 90° bend
6.2.3 Two 90° bends in perpendicular planes
6.2.4 Concentric expander
6.2.5 Partially closed valves
6.3 Additional specific installation requirements for cone meters
6.3.1 Circularity and cylindricality of the pipe
6.3.2 Roughness of the upstream and downstream pipe
6.3.3 Positioning of a thermowell
20 7 Flow calibration of cone meters
7.1 General
7.2 Test facility
7.3 Meter installation
7.4 Design of the test programme
21 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
7.6.3 Uncertainty of the discharge coefficient of the cone meter
22 Annex A (informative) Table of expansibility (expansion) factor
23 Bibliography

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BS EN ISO 5167-5:2022
$142.49