BS 1042-2.4:1989

National foreword
Committees responsible
Method
1. Scope and field of application
2. References
3. Definitions and symbols
4. Principle
5. Description of the current-meter
6. Requirements for the use of current-meters
7. Setting of current-meters into the conduit
8. Determination of the mean axial fluid velocity
     by graphical integration of the velocity area
9. Determination of the mean axial fluid velocity by
     graphical integration of the velocity area
10. Determination of the mean axial fluid velocity
     by arithmetical methods
11. Uncertainty in the measurement of flow-rate
Tables
1. The minimum Reynolds number as a function of the
     universal coefficient for pipe and head loss,
     lambda
2. Log-linear method in a circular cross-section -
     Location of measuring points
3. Log-linear method in a rectangular cross-section -
     Location of measuring points and weighting
     coefficients
4. Log Tchebycheff method in a circular cross-section
     - Location of measuring points
5. Log-Tchebycheff method in a rectangular cross-
     section - Location of measuring points
6. Location of measuring points in an annular section
     for four points per radius
7. Locations of the transverse lines in a rectangular
     section with cut-off corners
8. Locations of the transverse lines in a rectangular
     section with quarter-circle corners
9. Measuring point distribution
10. Values of coefficients alpha i for a number p of
     measuring points
11. Boundary layer coefficient m as a function of
     lambda
12. Values of Student's t
Figures
1. Stationary array of current-meters mounted on
     cross-bars in a circular conduit
2. Diametral arm device rotating in a circular
     conduit
3. Computation of the mean axial fluid velocity in a
     circular conduit-graphical integration in the
     area scanned by the current meters
4. Computation of the mean axial fluid velocity in
     a conduit of rectangular cross-section-graphical
     integration in the area scanned by current-meters
5. Location of measuring points in a rectangular
     cross-section conduit for the log-linear method
     using 26 points
6. Location of measuring points in a rectangular
     cross-section conduit in the case of the log-
     Tchebycheff method
7. Annular section
8. Rectangular section with cut-off corners
9. Rectangular section with quarter-circle corners
10. Example of mounting strut
11. Example of measuring point distribution in a
     conduit of circular cross-section
12. Velocity distribution in the peripheral zone
13. Illustration of the correction to allow for the
     mean estimated systematic error
14. Uncertainty, +/- delta t
Annexes
A. Measuring sections other than circular or
     rectangular sections
B. Corrections for blockage effect
C. Recommendations for the selection of the type of
     current-meter and mounting strut
D. Example of measuring point distribution along a
     radius for velocity measurement in a conduit of
     circular cross-section in the case of the graphical
     and numerical methods
E. Determination of boundary layer coefficient m for
     extrapolation near the wall
F. Definition of terms and procedures used in the
     uncertainty calculation
G. Student's t distribution
H. Examples of values of component uncertainties
J. Example of calculation of the uncertainty in the
     flow-rate measurement using current-meters

Determination of the volume flow rate in a closed conduit using propeller type current meters. Also the calculation of flow rate and calibration of the current meter.