Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full - Venturi tubes1 Scope This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) of Venturi tubes 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 51671. This part of ISO 5167 is applicable only to Venturi

are not included in BS EN 14731:

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