BS 1042-2.1:1983
Superseded
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Measurement of fluid flow in closed conduits. Velocity area methods Method using Pitot static tubes
Hardcopy , PDF
31-08-2008
English
31-10-1983
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National foreword
Committees responsible
Method
1. Scope and field of application
2. Symbols and definitions
3. Principle
4. Design of Pitot tubes
5. Requirements for use of Pitot tubes
6. Positioning of Pitot tube
7. Velocity computation
8. Determination of the discharge velocity by
graphical integration of the velocity area
9. Determination of the discharge velocity by
numerical integration of the velocity area
10. Determination of the discharge velocity by
arithmetic methods
11. Corrections of local velocity measurements
12. Errors
Annexes
A. Pitot tubes
B. Correction to the measuring position of Pitot
tubes used in a transverse velocity gradient
C. Study concerning turbulence correction
D. Damping of pressure gauges
E. Measurements with a Pitot tube in a compressible
fluid
F. Determination of coefficient m for extrapolation
near the wall
G. Example of calculation of the uncertainty on the
flow-rate measurement by means of Pitot tubes
Figures
1. Computation of the discharge velocity in a
circular conduit - Graphical integration in the
area explored by the Pitot tubes
2. Computation of the discharge velocity in a
rectangular conduit - Graphical integration
in the area explored by Pitot tubes
3. Location of measuring points in a rectangular
cross-section conduit in the case of the 'log-
linear' method using 26 points
4. Position of the measuring points in a rectangular
conduit in the case of the 'log Tchebycheff'
method
5. Variation of blockage constant with distance ahead
of cylindrical stem in a closed conduit
6. Overall correction to be added to volume flow
rate to allow for Pitot-stem blockage
7. Overall correction to be added to volume flow rate
to allow for Pitot-displacement
8. AMCA type
9. NPL type with modified ellipsoidal nose
10. Profile definition of the ellipsoidal head
11. CETIAT type
12. Values of (delta p psi - delta po) / delta po
Gives a method for the determination of the volume rate of flow of a regular flow in closed conduits. Covers the technology and maintenance of Pitot-static tubes, with the calculation of local velocities and computation of flowrate by velocity integration.
| Committee |
CPI/30
|
| DevelopmentNote |
Supersedes BS 1042-2(1964) (07/2004) Supersedes 76/21811 DC. (06/2005)
|
| DocumentType |
Standard
|
| Pages |
44
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy | |
| Supersedes |
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