BS EN ISO 5167-4-2003 用插入圆截面管道中的压差装置测量流体流量.文氏管

标准号：BS EN ISO 5167-4-2003
中文标准名称：用插入圆截面管道中的压差装置测量流体流量.文氏管
英文标准名称：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full. Venturi tubes
标准类型：A42
发布日期：2003/3/18 12:00:00
实施日期：2003/3/18 12:00:00
中国标准分类号：A42
国际标准分类号：17.120.10
适用范围：This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) ofVenturi tubes when they are inserted in a conduit running full to determine the flowrate of the fluid flowing inthe conduit.This part of ISO 5167 also provides background information for calculating the flowrate and is applicable inconjunction with the requirements given in ISO 5167-1.This part of ISO 5167 is applicable only to Venturi tubes in which the flow remains subsonic throughout themeasuring section and where the fluid can be considered as single-phase. In addition, each of these devicescan only be used within specified limits of pipe size, roughness, diameter ratio and Reynolds number. Thispart of ISO 5167 is not applicable to the measurement of pulsating flow. It does not cover the use of Venturitubes in pipes sized less than 50 mm or more than 1 200 mm, or where the pipe Reynolds numbers are below2 × 105.This part of ISO 5167 deals with the three types of classical Venturi tubes:a) cast;b) machined;c) rough welded sheet-iron.A Venturi tube is a device which consists of a convergent inlet connected to a cylindrical throat which is in turnconnected to a conical expanding section called the “divergent”. The differences between the values of theuncertainty of the discharge coefficient for the three types of classical Venturi tube show, on the one hand, thenumber of results available for each type of classical Venturi tube and, on the other hand, the more or lessprecise definition of the geometric profile. The values are based on data collected many years ago. Venturinozzles (and other nozzles) are dealt with in ISO 5167-3.