BS 6759-2:1984
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Hardcopy , PDF
18-05-2004
English
31-08-1984
Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Definitions
Section two. Material requirements and limitations
3. Pressure containing components
Section three. Design and construction
4. General
5. Helical compression springs
Section four. Production testing and inspection
6. General
7. Pressure tests
8. Repair of defects in forgings and castings
Section five. Marking and preparation for despatch
9. Marking
10. Preparation for despatch
Section six. Performance testing
11. Type testing of safety valves for operating and
flow characteristics using air or other gas of
known characteristics
12. Tests to determine operating characteristics
13. Test to determine flow characteristics
14. Determination of coefficient of discharge and
certified discharge capacity
15. Equivalent capacity
Appendices
A. Derivation of equation (11) for the certified
capacity of a safety valve for air
B. Derivation of compressibility factor Z
Tables
1. Spring materials and characteristics
2. Value of the stress correction factor for
curvature (K)
3. Load/length tolerances
4. Minimum duration of pressure test
5. Values of C relative to values of k
6. Capacity correction factors for back pressure (Kb)
Figures
1. Illustration of area definitions
2. Illustration of an end coil
3. Spring plate
4. Compressibility factor Z as a function of reduced
pressure pr and reduced temperature Tr
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