ISO 5167-3:2020 用压差装置测量管道循环交叉液体流量 第3部分：喷嘴和文氏管喷嘴

标准编号：ISO 5167-3:2020

中文名称：用压差装置测量管道循环交叉液体流量 第3部分：喷嘴和文氏管喷嘴

英文名称：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 3: Nozzles and Venturi nozzles

发布日期：2020-08

标准范围

本文件规定了当喷嘴和文丘里喷嘴插入到充满运行的导管中以确定在导管中流动的流体的流速时，喷嘴和文丘里喷嘴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速的背景信息，并与ISO 5167中给出的要求一起适用？1.本文件适用于喷嘴和文丘里喷嘴，其中流动在整个测量部分保持亚音速，并且流体可以被认为是单相的。此外，每个装置只能在管道尺寸和雷诺数的规定限制内使用。不适用于脉动流的测量。它不包括在管道尺寸小于50毫米或大于630毫米，或管道雷诺数低于10 000的情况下使用喷嘴和文丘里喷嘴。本文件涉及a)三种类型的标准喷嘴:ISA 1932[1]喷嘴；长半径喷嘴[2]；喉部攻丝喷嘴b)文丘里喷嘴。这三种类型的标准喷嘴是根本不同的，并且在本文件中分别描述。文丘里喷嘴具有与ISA 1932喷嘴相同的上游面，但具有发散部分，因此具有用于下游压力分接头的不同位置，并且单独描述。这种设计比类似的喷嘴具有更低的压力损失。对于所有这些喷嘴和文丘里喷嘴，已经进行了直接校准实验，其数量、范围和质量足以使连贯的应用系统能够基于它们的结果和系数以某些可预测的不确定性极限给出。[1]ISA是国际标准化组织联合会的缩写，1946年被ISO取代。[2]长半径喷嘴在形状和压力龙头位置上与ISA 1932喷嘴不同。

This document specifies the geometry and method of use (installation and operating conditions) of nozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate of the fluid flowing in the conduit.This document also provides background information for calculating the flowrate and is applicable in conjunction with the requirements given in ISO 5167？1.This document is applicable to nozzles and Venturi nozzles in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. In addition, each of the devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes less than 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000.This document deals witha) three types of standard nozzles:

1. ISA 1932^[1] nozzle;
2. the long radius nozzle^[2];
3. the throat-tapped nozzle

b) the Venturi nozzle.The three types of standard nozzle are fundamentally different and are described separately in this document. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergent section and, therefore, a different location for the downstream pressure tappings, and is described separately. This design has a lower pressure loss than a similar nozzle. For all of these nozzles and for the Venturi nozzle direct calibration experiments have been made, sufficient in number, spread and quality to enable coherent systems of application to be based on their results and coefficients to be given with certain predictable limits of uncertainty.^[1] ISA is the abbreviation for the International Federation of the National Standardizing Associations, which was superseded by ISO in 1946.^[2] The long radius nozzle differs from the ISA 1932 nozzle in shape and in the position of the pressure tappings.

标准预览图