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BS ISO 7194:2008

BS ISO 7194:2008

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The latest, up-to-date edition.

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 statics tubes

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

08-31-2008

Publisher

British Standards Institution

Foreword
Introduction
1 Scope
2 Normative references
3 Symbols
4 Principle
5 Choice of measuring plane
6 Devices for improving flow conditions
7 Measurement of local velocities
8 Determination of mean flow velocity
9 Accuracy of flow-rate estimation
Annex A (normative) - Detection and removal of regular
        pressure fluctuations
Annex B (normative) - Damping of manometers
Annex C (normative) - Calculation of Pitot static tube
        locations for method B
Annex D (normative) - Corrections to be applied when a
        Pitot static tube is used
Annex E (normative) - Corrections to be applied when a
        current-meter is used
Annex F (normative) - Errors due to non-axisymmetrical
        velocity distribution
Bibliography

Describes velocity-area methods for measuring flow in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes.

This International Standard specifies velocity-area methods for measuring flow in swirling or asymmetric flow conditions 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 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 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 of asymmetry Y (defined in AnnexF) is greater than 0,15.

This International Standard deals only with instruments for measuring local velocity as defined in ISO3354 and ISO3966. If Pitot static tubes are used, this International Standard applies only to flows where the Mach number corresponding to local velocities does not exceed 0,25.

Committee
CPI/30/5
DevelopmentNote
Supersedes BS 1042-2.3(1984). (08/2008)
DocumentType
Standard
Pages
38
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 7194:2008 Identical

ISO 5168:2005 Measurement of fluid flow — Procedures for the evaluation of uncertainties
ISO 3354:2008 Measurement of clean water flow in closed conduits — Velocity-area method using current-meters in full conduits and under regular flow conditions
ISO/TR 3313:1998 Measurement of fluid flow in closed conduits Guidelines on the effects of flow pulsations on flow-measurement instruments
ISO 3966:2008 Measurement of fluid flow in closed conduits Velocity area method using Pitot static tubes
ISO 3455:2007 Hydrometry Calibration of current-meters in straight open tanks
ISO 4006:1991 Measurement of fluid flow in closed conduits — Vocabulary and symbols

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