ISO 5167-6:2019 用压差装置测量管道循环交叉液体流量 第6部分：计量楔米

标准编号：ISO 5167-6:2019

中文名称：用压差装置测量管道循环交叉液体流量 第6部分：计量楔米

英文名称：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 6: Wedge meters

发布日期：2019-02

标准范围

本文件规定了楔形流量计插入满管管道时的几何形状和使用方法（安装和操作条件），以确定管道中流动流体的流速。注1:由于未校准楔形流量计的不确定度对于特定应用而言可能太大，因此有必要根据第7条校准流量计。本文件给出了校准要求，如果适用，则在校准雷诺数范围内使用。第7条也可以作为校准类似设计但不在本文件范围内的仪表的有用指南。它还提供了计算流量的背景信息，并适用于ISO 5167-1中给出的要求。本文件仅适用于流量在整个测量段内保持亚音速且流体可视为单一流体的楔形流量计-阶段未经校准的楔形流量计只能在管道尺寸、粗糙度、β（或楔形比）和雷诺数的规定范围内使用。它不适用于脉动流量的测量。它不包括在内径小于50 mm或大于600 mm的管道中，或管道雷诺数低于1×104的管道中使用未校准楔形流量计。注2:楔形流量计有一个主要元件，由特定几何形状的楔形限制组成。楔形流量计的替代设计可用；然而，在撰写本文时，没有足够的数据来充分描述这些装置的特性，因此这些仪表是根据第7条进行校准的。

This document specifies the geometry and method of use (installation and operating conditions) of wedge meters when they are inserted in a conduit running full to determine the flow rate of the fluid flowing in the conduit.NOTE 1 As the uncertainty of an uncalibrated wedge meter can be too large for a particular application, it could be deemed essential to calibrate the flow meter according to Clause 7.This document gives requirements for calibration which, if applied, are for use over the calibrated Reynolds number range. Clause 7 could also be useful guidance for calibration of meters of similar design but which fall outside the scope of this document.It 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 only to wedge meters in which the flow remains subsonic throughout the measuring section and where the fluid can be considered as single-phase. Uncalibrated wedge meters can only be used within specified limits of pipe size, roughness, beta (or wedge ratio) and Reynolds number. It is not applicable to the measurement of pulsating flow. It does not cover the use of uncalibrated wedge meters in pipes whose internal diameter is less than 50 mm or more than 600 mm, or where the pipe Reynolds numbers are below 1 × 104.NOTE 2 A wedge meter has a primary element which consists of a wedge-shaped restriction of a specific geometry. Alternative designs of wedge meters are available; however, at the time of writing there is insufficient data to fully characterize these devices, and therefore these meters are calibrated in accordance with Clause 7.

标准预览图