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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

Publication date:   Jul 10, 2008

General information

90.99 Withdrawal of Standard proposed by TC or SC   Nov 12, 2024

ISO

ISO/TC 30/SC 5 Velocity and mass methods

International Standard

17.120.10   Flow in closed conduits

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7194:1983

NOW

PUBLISHED
ISO 7194:2008
90.99 Withdrawal of Standard proposed by TC or SC
Nov 12, 2024