BS 1042-2.3:1984

National foreword
Committees responsible
Methods
0. Introduction
1. Scope and field of application
2. 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
Annexes
A. Detection and removal of regular pressure
     fluctuations
B. Damping of manometers
C. Calculation of Pitot static tube locations for
     method B
D. Corrections to be applied when a Pitot static tube
     is used
E. Corrections to be applied when a current-meter is
     used
F. Errors due to non-axisymmetrical velocity
     distribution
Figures
1. Installation of straightener
2. Type A - Zanker straightener
3. Type B - Sprenkle straightener
4. Type C - Tube bundle straightener
5. Type D - AMCA straightener
6. type E - Etoile straightener
7. Wedge-shaped yaw probe
8. Cylindrical yaw probe
9. k psi versus psi for typical Pitot static tubes
10. Maximum permissible size of Pitot static tube
     in method B
11. Examples of directional response of different
     types of current-meters
12. Non-return valve
13. Arrangement of non-return valves
14. Device for checking damping of pressure
     fluctuations in the leads to the manometer
15. Radial positions of Pitot static tube in swirling
     flow when method B is used
16. Pitot static tube
17. Example of the effect of axial pulsations on
     current meter velocity estimation
18. Example of the effect of tangential pulsations on
     current meter velocity estimation

Gives velocity area methods for measuring flow and details the precautions to be taken and the corrections to be made. Also describes the additional uncertainties which are introduced when a measurement in asymmetric or swirling flow has to be made.