BS 1042-2.1:1983

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.