標準號：BS EN ISO 5167-3-2003
中文標準名稱：用插入圓截面管道中的壓差裝置測量流體流量.噴嘴和文氏噴嘴
英文標準名稱：Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full. Nozzles and Venturi nozzles
標準類型：A42
發布日期：2003/3/18 12:00:00
實施日期：2003/3/18 12:00:00
中國標準分類號：A42
國際標準分類號：17.120.10
適用范圍：This part of ISO 5167 specifies the geometry and method of use (installation and operating conditions) ofnozzles and Venturi nozzles when they are inserted in a conduit running full to determine the flowrate of thefluid flowing in the 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 to nozzles and Venturi nozzles in which the flow remains subsonicthroughout the measuring section and where the fluid can be considered as single-phase. In addition, each ofthe devices can only be used within specified limits of pipe size and Reynolds number. It is not applicable tothe measurement of pulsating flow. It does not cover the use of nozzles and Venturi nozzles in pipe sizes lessthan 50 mm or more than 630 mm, or where the pipe Reynolds numbers are below 10 000.This part of ISO 5167 deals witha) two types of standard nozzles:1) the ISA5) 1932 nozzle;2) the long radius nozzle6);b) the Venturi nozzle.The two types of standard nozzle are fundamentally different and are described separately in this part ofISO 5167. The Venturi nozzle has the same upstream face as the ISA 1932 nozzle, but has a divergentsection 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 both of these nozzles and for the Venturinozzle direct calibration experiments have been made, sufficient in number, spread and quality to enablecoherent systems of application to be based on their results and coefficients to be given with certainpredictable limits of uncertainty.