BS 1042-1.5(1987) : 1987
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
MEASUREMENTS OF FLUID FLOW IN CLOSED CONDUITS - GUIDE TO THE EFFECT OF DEPARTURE FROM THE STANDARD CONDITIONS SPECIFIED IN SECTION 1.1
Hardcopy , PDF
15-06-1997
English
01-01-1987
Foreword
Committees responsible
Guide
Section one. General
0. Introduction
1. Scope
2. Symbols and definitions
3. Effect of errors on flowrate calculations
Section two. Effects of deviations in construction
4. Orifice plate edge sharpness
5. Thickness of orifice edge
6. Flatness of upstream face
7. Position of pressure tappings
8. Condition of pressure tappings
Section three. Effects of pipeline near the device
9. Pipe diameter
10. Steps and taper sections
11. Diameter of carrier ring
12. Undersize joint rings
13. Protruding welds
14. Eccentricity
Section four. Effects of pipe layout
15. General
16. Discharge coefficient compensation
17. Pressure tappings
18. Devices for improving flow conditions
Section five. Operational deviations
19. General
20. Buckling of an orifice plate
21. Deposition on the upstream face of an orifice plate
22. Deposition in the meter tube
23. Deposition and the increase of surface roughness
in venturi tubes
24. Orifice plate edge squareness
Section six. Pipe roughness
25. General
26. Upstream pipe
27. Downstream pipe
28. Reduction of roughness effects
29. Maintenance
Appendix
A. Bibliography
Tables
1. Symbols
2. Effect of taper pieces
3. Percentage discharge coefficient changes when
the straight pipe lengths before the orifice are
less than specified in BS 1042: Section 1.1
4. Formulae for additional uncertainty in the orifice
discharge coefficient to be used with the
percentage changes of table 3 for all tapping
arrangements
5. Effect of deposits on beta=0.2 and beta=0.7 orifice
plates
6. Recommendations regarding extent of cleaning
Figures
1. Carrier having internal diameter D1 less than pipe
diameter D
2. Effect of incorrect carrier diameter
3. Possible orifice plate eccentricity resulting
from specified tolerances on bolt hole, bolt hole
pitch circle, pipe o.d. and flange bore
4. Discharge coefficient error vs eccentricity for an
orifice plate with D,D/2 and flange taps
5. Triple-T connection arrangement
6. Flow straightener installation
7. Effect of a Zander straightener on the
measurement error
8. Flow straighteners
9. Effect of orifice plate buckling on flow
measurement accuracy
10. Effect of welding rods in meter tube
11. Effect of debris in meter tube (on both sides
of plate)
12. Variation of venturi meter coefficient with
surface roughness
13. The combined effect of abnormal roughness and
diminution in pipe bore on orifice plates
with corner tappings for all pipe sizes larger
than 75 mm
14. The effect of abnormal roughness on orifice plates
with corner tappings for all pipe sizes larger
than 75 mm
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