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

标准号：ISO 7194-2008
中文标准名称：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
英文标准名称：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
标准类型：A50
发布日期：2008/7/15 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：A50
国际标准分类号：17.120.10
引用标准：ISO/TR 3313;ISO 3354-2008;ISO 3455-2007;ISO 3966-2008;ISO 5168;ISO 4006
适用范围：This International Standard specifies velocity-area methods for measuring flow in swirling or asymmetric flowconditions in circular ducts by means of current-meters or Pitot static tubes.It specifies the measurements required, the precautions to be taken, the corrections to apply, and describesthe additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has tobe made.Only flows with a negligible radial component are considered, however. Furthermore, it is not possible to makea measurement in accordance with this International Standard if, at any point in the measuring cross-section,the local velocity makes an angle of greater than 40~ with the axis of the duct, or where the index ofasymmetry Y (defined in Annex F) is greater than 0,15.This International Standard deals only with instruments for measuring local velocity as defined in ISO 3354and ISO 3966. If Pitot static tubes are used, this International Standard applies only to flows where the Machnumber corresponding to local velocities does not exceed 0,25.