Measurement of fluid flow by means of pressure differential devices — Part 1: Orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full
用压差装置测量流体流量.第1部分:插入圆截面管道中的孔板、喷嘴和文丘里管
Specifies the geometry and method of use (installation and operating conditions). Gives necessary information for calculating the flow-rate and its associated uncertainty. Applies only to devices in which the flow remains subsonic.