ISO 7194:2008
封闭管道中流量的测量.使用流量计或皮托静压管测量圆管中涡流或不对称流动条件下流量用速度面积法
Measurement of fluid flow in closed conduits - Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes