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ISO 5167-2:2022

Current Date published:

Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates

This document 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 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 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 are not covered by this document. This document 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[1]. It does not cover the use of orifice plates in pipe sizes less than 50 mm or more than 1 000 mm, or where the pipe Reynolds numbers are below 5 000.

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Related Information

Similar Standards

  • BS 1042-2.2:1983

    Measurement of fluid flow in closed conduits. Velocity area methods, Method of measurement of velocity at one point of a conduit of circular cross section

  • BS 5857-1.1:1980

    Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of water flow, General

  • BS 5857-1.2:1980

    Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of water flow, Constant rate injection method using non-radioactive tracers

  • BS 5857-1.3:1980

    Methods for measurement of fluid flow in closed conduits, using tracers. Measurement of water flow, Constant rate injection method using radioactive tracers

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