用插入圆形横截面管道中的压差装置测量流体流量第2部分:孔板

[中文适用范围]： 本文件规定了孔板插入满流管道以确定管道中流动流体的流量时的几何形状和使用方法（安装和操作条件）。本文件还提供了计算流量的背景信息，并与 ISO 5167-1 中的要求结合使用。本文件适用于具有与法兰取压口、角取压口或 D 和 D/2 取压口一起使用的孔板的一次设备。本文件不涉及“缩流”和管道取压口等其他取压口。本文件仅适用于在整个测量段保持亚音速的流动，其中流体可被视为单相。它不适用于脉动流的测量[1]。它不涵盖在小于 50 毫米或大于 1000 毫米的管道尺寸中或管道雷诺数低于 5000 的情况下使用孔板的情况。 [外文原描述]： 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.