BS EN 16145:2012

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Designation
6 Marking
7 Materials
8 Dimensional Characteristics
9 Leaktightness Characteristics
10 Mechanical Characteristics
11 Hydraulic Characteristics
12 Backflow protection
13 Acoustic characteristics
14 Rotary connection
Annex A (informative) - Pressure take-off tee
Bibliography

Defines: - the dimensional, leaktightness, mechanical, hydraulic and acoustic characteristics with which extractable outlets with or without spray mode selector function need to comply; - the procedures for testing these characteristics.

This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of orifice plates when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit.

This part of ISO 5167 also provides background information for calculating the flowrate and is applicable in conjunction with the requirements given in ISO 5167-1.

This part of ISO 5167 is applicable to primary devices having an orifice plate used with flange pressure tappings, or with corner pressure tappings, or with D and D/2 pressure tappings. Other pressure tappings such as “vena contracta?? and pipe tappings have been used with orifice plates but are not covered by this part of ISO 5167. This part of ISO 5167 is applicable only to a flow which 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. It does not cover the use of orifice plates in pipe sizes less than 50 mm or more than 1 000 mm, or for pipe Reynolds numbers below 5 000.