ISO 5167-1 AMD 1-1998 用压差装置测量流体流量.第1部分:圆截面管道中插入的节流孔板、喷嘴和文杜利管.第1次修订
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; Amendment 1