Standard
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AS 4632:2020
[Current]Over-pressure and under-pressure shut-off devices
The objective of this Standard is to provide manufacturers, designers, regulatory authorities, testing laboratories and similar organizations with uniform minimum requirements for the safety and performance of over-pressure and under-pressure shut-off devices.
Published: 24/01/2020
Pages: 40
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
2 Design and construction
2.1 Materials
2.1.1 Continuity of satisfactory operation
2.1.2 Suitability of materials for conditions of use
2.1.3 Materials in contact with gas
2.1.4 Melting point of metallic materials
2.1.5 Copper containing alloy parts
2.2 Construction
2.2.1 Continuity of satisfactory operation
2.2.2 Castings and hot pressings
2.2.3 Sealing of porous castings or cracks
2.2.4 Assembled device to be clean
2.2.5 Accidental displacement of parts
2.2.6 Attachment of knobs, handles, dials and pointers
2.2.7 Springs
2.2.8 Securing of parts together
2.2.9 Sharp edges
2.2.10 Holes for assembly or mounting
2.2.11 Permanent sealing of non-functional holes
2.2.12 Self-tapping screws
2.2.13 Application of lubricant or sealant
2.2.14 Tightening of a gland or any other adjustments
2.2.15 Threaded connection with spanner flats
2.2.16 Threaded connections
2.2.17 Flange connections
2.2.18 Connections within an appliance
2.2.19 Connections above 200 kPa
2.3 Design
2.3.1 Components requiring servicing
2.3.2 Protection of mechanism
2.3.3 Venting
2.3.4 Safety device cannot be overridden
2.3.5 Accessibility for adjustment
2.3.6 Adjusting devices
2.3.7 No reduction of gas flow area
2.3.8 Over-pressure shut-off device as part of a pressure regulator
2.3.9 Manual reset — Over-pressure and under-pressure shut-off device
2.3.10 Components requiring servicing
2.4 Markings
2.4.1 General
2.4.2 Marking of electrical connections
2.4.3 Durability of markings
2.4.4 Markings for fitting of an external sensing line
2.5 Instructions
2.5.1 General
3 Performance requirements
3.1 General
3.1.1 Commissioning and adjustment
3.1.2 Satisfactory performance in all mounting positions
3.1.3 Operation and accuracy over declared temperature range
3.2 Leakage
3.2.1 External leakage
3.2.2 Internal leakage
3.3 Flow rate for a given pressure
3.4 Resetting — Effort to reset and fully open device
3.5 Mechanical strength
3.5.1 Resistance to applied torque
3.5.2 Resistance to applied bending moments
3.6 Repeatability
3.6.1 Tripping and resetting cycles — Under-pressure shut-off devices
3.6.2 Tripping and resetting cycles — Over-pressure shut-off devices
3.6.3 Tripping pressure
3.6.4 Tripping pressure accuracy
3.7 Closing time
3.7.1 Time to close after tripping — Manufacturer’s tripping pressure range
3.7.2 Time to close after tripping — Device independent of inlet pressure
3.8 Durability
3.8.1 Over-pressure shut-off device — Endurance
3.8.2 Under-pressure shut-off device — Endurance
3.8.3 Gas leakage after performance testing
3.8.4 Weight of diaphragm material
3.8.5 Weight of valve seating material
Appendix A
Appendix B
B.1 Test medium and gases
B.1.1 Testing medium
B.1.2 Test gases
B.2 Initial setting
B.3 Lubricants
B.4 Testing sequence
B.5 Heat resistance
B.5.1 General
B.5.2 Principle
B.5.3 Apparatus
B.5.4 Procedure
B.5.5 Test report
B.6 Markings and labels
B.6.1 General
B.6.2 Principle
B.6.3 Apparatus
B.6.4 Materials
B.6.5 Procedure
B.6.6 Test report
B.7 External leakage
B.7.1 General
B.7.2 Principle
B.7.3 Apparatus
B.7.4 Materials
B.7.5 Preparation of apparatus
B.7.6 Procedure
B.7.7 Test report
B.8 Internal leakage
B.8.1 General
B.8.2 Principle
B.8.3 Apparatus
B.8.4 Materials
B.8.5 Preparation of apparatus
B.8.5.1 Procedure
B.8.6 Test report
B.9 Flow rate
B.9.1 General
B.9.2 Principle
B.9.3 Apparatus
B.9.4 Materials
B.9.5 Preparation of apparatus
B.9.6 Procedure
B.9.7 Calculations
B.9.8 Test report
B.10 Effort to reset and fully open device
B.10.1 General
B.10.2 Principle
B.10.3 Apparatus
B.10.4 Materials
B.10.5 Preparation of apparatus
B.10.6 Procedures
B.10.6.1 Procedure A
B.10.6.2 Procedure B
B.10.6.3 Procedure C
B.10.7 Test report
B.11 Torque test
B.11.1 General
B.11.2 Principle
B.11.3 Apparatus
B.11.4 Materials
B.11.5 Preparation of apparatus
B.11.6 Procedure
B.11.7 Test report
B.12 Bending moment test
B.12.1 General
B.12.2 Principle
B.12.3 Apparatus
B.12.4 Preparation of apparatus
B.12.5 Procedure
B.12.6 Test report
B.13 Closing times and tripping pressures
B.13.1 General
B.13.2 Principle
B.13.3 Apparatus
B.13.4 Materials
B.13.5 Preparation of apparatus
B.13.6 Procedures
B.13.6.1 General
B.13.6.2 Procedure A
B.13.6.3 Procedure B
B.13.6.4 Procedure C
B.13.6.5 Procedure D
B.13.7 Test report
B.14 Repeatability
B.14.1 General
B.14.2 Principle
B.14.3 Apparatus
B.14.4 Materials
B.14.5 Preparation of apparatus
B.14.6 Procedures
B.14.6.1 General
B.14.6.2 Procedure A
B.14.6.3 Procedure B
B.14.6.4 Procedure C
B.14.6.5 Procedure D
B.14.6.6 Procedure E
B.14.6.7 Procedure F
B.14.7 Test report
B.15 Durability
B.15.1 General
B.15.2 Principle
B.15.3 Apparatus
B.15.4 Materials
B.15.5 Preparation of apparatus
B.15.6 Procedures
B.15.6.1 Procedure A
B.15.6.2 Procedure B
B.15.6.3 Test report
B.16 n-pentane resistance
B.16.1 General
B.16.2 Principle
B.16.3 Apparatus
B.16.4 Materials
B.16.5 Preparation of apparatus
B.16.6 Procedure
B.16.7 Calculation
B.16.8 Test report
Appendix C
Bibliography
Cited references in this standard
[Current]
Method for detecting the susceptibility of copper and its alloys to stress corrosion cracking using the mercurous nitrate test
[Current]
Gas installations, Part 2: LP Gas installations in caravans and boats for non-propulsive purposes
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