BS ISO 7194:2008
Current
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
Hardcopy , PDF
English
31-08-2008
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.
| Committee |
CPI/30/5
|
| DevelopmentNote |
Supersedes BS 1042-2.3(1984). (08/2008)
|
| DocumentType |
Standard
|
| Pages |
38
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
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.
| Standards | Relationship |
| ISO 7194:2008 | Identical |
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