BS 6759-3:1984
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Safety valves Specification for safety valves for process fluids
Hardcopy , PDF
18-05-2004
English
29-06-1984
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Foreword
Committees responsible
Specification
Section one. General
1. Scope
2. Definitions
Section two. Material requirements and limitations
3. Pressure containing components
4. Spring materials
5. Other internal parts
Section three. Design and construction
6. General
7. Springs
Section four. Production testing and inspection
8. General
9. Safety
10. Pressure tests
11. Repairs
12. Test certificate
Section five. Marking and preparation for despatch
13. Body marking
14. Identification plate
15. Preparation for despatch
Section six. Performance testing
16. Type testing of safety valves for operating and
flow characteristics using steam, air, water or
other gases or liquids of known characteristics
17. Type tests to determine operating characteristics
18. Type tests to determine flow characteristics
19. Determination of coefficient of discharge and
certified discharge capacity
20. Equivalent capacity
Appendices
A. Guidance on safety valve types and features
B. Relationship between pressure terms used to
describe safety valve characteristics and the
requirements of the system to be protected
C. Flow areas
D. Guidance on safety valve installation
E. Provision of information
F. Preferred connection sizes
G. Derivation of compressibility factor Z
H. Determination of average values of M, gamma, Tc
and pc for gas mixtures
Tables
1. Materials for pressure containing components
2. Spring materials
3. Stress correction factor for curvature (K)
4. Load/length tolerances
5. Spring rate tolerances
6. Inside diameter tolerances
7. Free length tolerances
8. Minimum duration of pressure test
9. Seat leakage rates
10. Values of C relative to values of k
11. Capacity correction factors for back pressure (kb)
12. Flow areas
13. Valve data for conventional, balanced bellows and
balanced piston valves
14. Maximum pressure ratings for different temperature
ranges
15. Properties of gases
Figures
1. Safety valve layout and components
2. Illustration of an end coil
3. Spring plate
4. End-squareness
5. End-parallelism
6. Typical test rig for determination of valve
leakage rates
7. Compressible factor Z as a function of reduced
pressure pr and reduced temperature Tr
8. Capacity correction factor for viscosity (f mu)
9. Typical pressure term relationships
10. Illustration of area definitions
Requirements for the design, selection and flow certification of safety valves for use with process fluids.
| Committee |
PSE/18/6
|
| DocumentType |
Standard
|
| Pages |
56
|
| PublisherName |
British Standards Institution
|
| Status |
Superseded
|
| SupersededBy |
| Standards | Relationship |
| ISO 4126:1981 | Similar to |
| PD 5500:2000 | SPECIFICATION FOR UNFIRED FUSION WELDED PRESSURE VESSELS |
| BS 5908:1990 | Code of practice for fire precautions in the chemical and allied industries |
| BS 4434:1995 | Specification for safety and environmental aspects in the design, construction and installation of refrigerating appliances and systems |
| BS 5500:1991 | Specification for unfired fusion welded pressure vessels |
| BS 4434:1989 | Specification for safety aspects in the design, construction and installation of refrigerating appliances and systems |
| BS 6739:1986 | Code of practice for instrumentation in process control systems: installation design and practice |
| BS 8010-2.8:1992 | Code of practice for pipelines. Pipelines on land: design, construction and installation Steel for oil and gas |
| API 6A : 2010 | SPECIFICATION FOR WELLHEAD AND CHRISTMAS TREE EQUIPMENT |
| API 605 : 4ED 88 | LARGE-DIAMETER CARBON STEEL FLANGES (NOMINAL PIPE SIZES 26 THROUGH 60; CLASSES 75, 150, 300, 400, 600 AND 900) |
| ISO 4126:1981 | Safety valves — General requirements |
| BS 1560-2:1970 | Circular flanges for pipes, valves and fittings (Class designated) Specification for steel pipe flanges (nominal sizes ½ in to 24 in). Metric dimensions |
| BS 970-4:1970 | Specification for wrought steels for mechanical and allied engineering purposes Valve steels |
| BS 6759-2:1984 | Safety valves Specification for safety valves for compressed air or inert gases |
| DTD 5086 : OCT 69 | 17.7 CHROMIUM NICKEL PRECIPITATION HARDENING STAINLESS STEEL ROD, WIRE AND SPRINGS |
| BS 6759-1:1984 | Safety valves Specification for safety valves for steam and hot water |
| SAE AMS 5698 : 2013 | NICKEL ALLOY, CORROSION AND HEAT-RESISTANT, WIRE, 72NI - 15.5CR - 0.95CB - 2.5TI - 0.70AL - 7.0FE, NO. 1 TEMPER, PRECIPITATION HARDENABLE |
| BS 1726-1:1987 | Coil springs. Guide for the design of helical compression springs |
| API 526 : 2017 | FLANGED STEEL PRESSURE-RELIEF VALVES |
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