用插入圆形横截面管道中的压差装置测量流体流量第1部分:一般原则和要求

[中文适用范围]： 本文件定义了术语和符号，并建立了在以下情况下通过压差装置（孔板、喷嘴、文丘里管、锥度计和楔形流量计）测量和计算管道中流体流量的方法的一般原则：它们被插入到充满的圆形横截面导管中。 本文件还规定了流量测量的测量方法、安装和不确定度的确定的一般要求。 其中流体可以被视为单相。 不适用于脉动流量的测量。 [外文原描述]： This document defines terms and symbols and establishes the general principles for methods of measurement and computation of the flow rate of fluid flowing in a conduit by means of pressure differential devices (orifice plates, nozzles, Venturi tubes, cone meters, and wedge meters) when they are inserted into a circular cross-section conduit running full. This document also specifies the general requirements for methods of measurement, installation and determination of the uncertainty of the measurement of flow rate. ISO 5167 (all parts) is applicable only to flow that 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.