UNE-EN ISO 5167-1:2023

This part of ISO 5167 defines terms and symbols and establishes the general principles for methods ofmeasurement and computation of the flowrate of fluid flowing in a conduit by means of pressuredifferential devices (orifice plates, nozzles, Venturi tubes, cone meters, and wedge meters) when they areinserted into a circular cross-section conduit running full. This part of ISO 5167 also specifies the generalrequirements for methods of measurement, installation and determination of the uncertainty of themeasurement of flowrate. It also defines the general specified limits of pipe size and Reynolds numberfor which these pressure differential devices are to be used.ISO 5167 (all parts) is applicable only to flow that remains subsonic throughout the measuring sectionand where the fluid can be considered as single-phase. It is not applicable to the measurement ofpulsating flow.