Reference number
ISO 7194:2008
International Standard
ISO 7194:2008
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
Edition 2
2008-07
Read sample
ISO 7194:2008
50627
Published (Edition 2, 2008)
This publication was last reviewed and confirmed in 2017. Therefore this version remains current.

ISO 7194:2008

ISO 7194:2008
50627
Language
Format
CHF 151
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Abstract

ISO 7194:2008 specifies velocity-area methods for measuring flow in swirling or asymmetric flow conditions in circular ducts by means of current-meters of Pitot static tubes.

ISO 7194:2008 specifies the measurements required, the precautions to be taken, the corrections to apply, and describes the additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has to be made.

Only flows with a negligible radial component are considered, however. Furthermore, it is not possible to make a measurement in accordance with ISO 7194:2008 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 of asymmetry Y (defined within ISO 7194:2008) is greater than 0,15.

ISO 7194:2008 deals only with instruments for measuring local velocity as defined in ISO 3354 and ISO 3966. If Pitot static tubes are used, ISO 7194:2008 applies only to flows where the Mach number corresponding to local velocities does not exceed 0,25.

General information

  •  : Published
     : 2008-07
    : Close of review [90.60]
  •  : 2
     : 27
  • ISO/TC 30/SC 5
    17.120.10 
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