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AS 4621:2019
[Current]Regulator for use with liquefied petroleum - Vapour phase
This Standard specifies the minimum safety and performance requirements for self-acting pressure regulators, installed independently or as part of a combination control, which are used to reduce the pressure of vapour phase liquefied petroleum gases to the maximum outlet pressures specified in Clause 1.4.
Published: 14/05/2019
Pages: 47
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope, references, definitions and classification
1.1 Scope
1.2 Normative references
1.3 Terms and definitions
1.4 Classification
2 Design and construction
2.1 Materials
2.1.1 Continuity of satisfactory operation
2.1.2 Suitability for the conditions of use
2.1.3 Materials in contact with gas
2.1.4 Melting point of metallic materials
2.1.5 Zinc alloys
2.1.6 Copper containing alloys
2.1.7 Component parts selected to appropriate Standards
2.2 Construction
2.2.1 Continued safe operation
2.2.2 Castings and hot pressings
2.2.3 Sealing of porous castings or cracks
2.2.4 Assembled regulator cleanliness
2.2.5 Parts secure against accidental displacement
2.2.6 Prevention of accidental shift after calibration
2.2.7 Attachment of knobs, handles, movable dials and pointers
2.2.8 Springs
2.2.9 Securing of parts together
2.2.10 Threaded connections with spanner flats
2.2.11 Threaded inlet connections
2.2.12 Sharp edges
2.2.13 Holes for assembly or mounting
2.2.14 Permanent sealing of non-functional holes
2.2.15 Self-tapping screws
2.3 Design
2.3.1 Accessibility for adjustment
2.3.2 Adjusting devices
2.3.3 Tightening of locking device
2.3.4 Design of adjustable regulator
2.3.5 Components requiring servicing
2.3.6 Venting
2.3.7 Pressure-relief discharge opening
2.3.8 Knobs and movable dials
2.3.9 Special purpose connections
2.3.10 Lock-up pressure type
2.4 Markings
2.4.1 General
2.4.2 Durability of markings
2.5 Instructions
3 Performance requirements
3.1 General
3.1.1 Satisfactory performance in all declared mounting positions
3.1.2 Satisfactory performance over declared temperature range
3.1.3 Diaphragm stability
3.1.4 Weight of diaphragm material
3.1.5 Weight of valve seating material
3.1.6 Valve seat stability
3.2 Leakage
3.2.1 Regulator parts subjected to pressure
3.2.2 Regulator parts not subjected to full inlet pressure and no pressure relief
3.2.3 Regulator parts not subjected to full inlet pressure incorporating pressure relief
3.3 Pressure relief valves
3.3.1 Discharge pressure
3.3.2 Discharge capacity
3.3.3 Over pressure protection
3.4 Operating characteristics
3.4.1 Variation of outlet pressure
3.4.2 Pressure variation with temperature changes
3.4.3 Lock-up pressure
3.5 Mechanical strength
3.5.1 Regulators capable of withstanding listed torque values
3.5.2 Regulators capable of withstanding listed bending moments
3.6 Resistance to hydrocarbons
3.7 Durability
3.7.1 Cycling test
Appendix A
Appendix B
B.1 Test gases
B.1.1 Test medium
B.1.2 Test gases
B.1.3 Pipe and fittings
B.2 Initial setting
B.3 Test sequence
B.4 Heat resistance
B.4.1 Scope
B.4.2 Principle
B.4.3 Apparatus
B.4.4 Procedure
B.4.5 Test report
B.5 Markings and labels
B.5.1 Scope
B.5.2 Principle
B.5.3 Apparatus
B.5.4 Materials
B.5.5 Procedure
B.5.6 Test report
B.6 Diaphragm material
B.6.1 Scope
B.6.2 Principle
B.6.3 Apparatus
B.6.4 Materials
B.6.5 Preparation
B.6.6 Procedure
B.6.7 Test report
B.7 N-pentane resistance
B.7.1 Scope
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 Calculation
B.7.8 Test report
B.8 Gas leakage
B.8.1 Scope
B.8.2 Principle
B.8.3 Apparatus
B.8.4 Materials
B.8.5 Preparation of apparatus
B.8.6 Procedure
B.8.7 Test report
B.9 Gas leakage — Regulators without pressure relief
B.9.1 Scope
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 Test report
B.10 Gas leakage — Regulators incorporating pressure relief
B.10.1 Scope
B.10.2 Principle
B.10.3 Apparatus
B.10.4 Materials
B.10.5 Preparation
B.10.6 Procedure
B.10.7 Test report
B.11 Discharge pressure and flow capacity of relief valve
B.11.1 Scope
B.11.2 Principle
B.11.3 Apparatus
B.11.4 Materials
B.11.5 Preparation
B.11.6 Procedure
B.11.7 Test report
B.12 Maximum regulator outlet pressure for regulators incorporating pressure relief
B.12.1 Scope
B.12.2 Principle
B.12.3 Apparatus
B.12.4 Materials
B.12.5 Preparation of apparatus
B.12.6 Procedure
B.12.7 Test report
B.13 Maximum regulator outlet pressure for regulators incorporating a shut off device
B.13.1 Scope
B.13.2 Principle
B.13.2.1 Operation test
B.13.2.2 Leakage test
B.13.2.3 Endurance test
B.13.2.4 Repeated operation and leakage test
B.13.2.5 Vibration test
B.13.2.6 Durability test
B.13.3 Apparatus
B.13.4 Materials
B.13.5 Preparation of apparatus
B.13.6 Procedure
B.13.6.1 General
B.13.6.2 Operation test
B.13.6.3 Leakage test
B.13.6.4 Endurance test
B.13.6.5 Repeated operation and leakage test
B.13.6.6 Vibration test
B.13.6.7 Durability test
B.13.7 Test report
B.14 Outlet performance
B.14.1 Scope
B.14.2 Principle
B.14.3 Apparatus
B.14.4 Materials
B.14.5 Preparation of apparatus
B.14.6 Procedure
B.14.7 Test report
B.15 Temperature resistance
B.15.1 Scope
B.15.2 Principle
B.15.3 Apparatus
B.15.4 Materials
B.15.5 Preparation of apparatus
B.15.6 Procedure
B.15.7 Test report
B.16 Lock-up pressure
B.16.1 Scope
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 Test report
B.17 Torque test
B.17.1 Scope
B.17.2 Principle
B.17.3 Apparatus
B.17.4 Materials
B.17.4.1 Preparation of apparatus
B.17.5 Procedure
B.17.6 Test report
B.18 Bending moment test
B.18.1 Scope
B.18.2 Principle
B.18.3 Apparatus
B.18.4 Preparation of apparatus
B.18.5 Procedure
B.18.6 Test report
B.19 Resistance to hydrocarbons
B.19.1 Scope
B.19.2 Principle
B.19.3 Apparatus
B.19.4 Materials
B.19.4.1 Preparation of apparatus
B.19.5 Procedure
B.19.6 Test report
B.20 Durability
B.20.1 Scope
B.20.2 Principle
B.20.3 Apparatus
B.20.4 Materials
B.20.4.1 Preparation of apparatus
B.20.5 Procedure
B.20.6 Test report
Appendix C
Bibliography
Amendment control sheet
AS 4621:2019
Amendment No. 1 (March 2022)
Revised text amendment
Amendment No. 2 (March 2024)
Revised text amendment
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]
Valves for compressed gas cylinders, Part 2: Outlet connections (threaded) and stem (inlet) threads
Content history
[Current]
[Current]
[Superseded]
[Superseded]
DR AS 4621:2018
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