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AS 4620-2004
[Current]Thermoelectric flame safeguards
Specifies the uniform minimum requirements for manufacturers, designers, regulatory authorities, testing laboratories and similar organizations for the safety, performance and use of flame safeguards operating on the thermoelectric principle. These flame safeguards are intended for use with natural gas, town gas, tempered liquefied petroleum gas and liquefied petroleum gas.
Published: 01/01/2004
Pages: 27
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope, classification and definitions
1.1 Scope
1.2 Classification
1.2.1 Type
1.2.2 Class
1.3 Definitions
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 the gas
2.1.4 Melting point of materials
2.1.5 Copper containing alloys
2.1.6 Component parts shall be selected from appropriate Standards
2.2 Design and construction
2.2.1 Continued safe operation
2.2.2 Castings and hot pressings
2.2.3 Porous castings or cracks
2.2.4 Assembled valves to be clean
2.2.5 Accidental displacement of parts
2.2.6 Factory calibration means sealed
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 Sharp edges
2.2.11 Means of limiting the travel of manual valves
2.2.12 Holes for assembly or mounting
2.2.13 Permanent sealing of non-functional holes
2.2.14 Self-tapping screws
2.2.15 The construction of parts not covered by this Standard
2.2.16 The tightening of a gland or any other adjustments
2.3 Design
2.3.1 Flame safeguard—Fail safe
2.3.2 Safety device cannot be overridden
2.3.3 Accessibility of integral parts
2.3.4 Adjusting devices
2.3.5 Locking device
2.3.6 Components requiring servicing
2.3.7 Special tools not required for servicing or replacement
2.3.8 Manual reset
2.3.9 Protection of mechanism
2.3.10 Knobs and movable dials
2.3.11 Connections
2.3.12 Proving of pilot flame
2.3.13 Location or enclosure of electrical parts
2.3.14 Separation of operating parts from stowed wiring
2.4 Markings
2.4.1 General
2.4.2 Electrical connections
2.4.3 Durability of markings
2.5 Instructions
2.5.1 General
3 Performance requirements
3.1 General
3.1.1 Satisfactory performance in all mounting positions
3.1.2 Satisfactory performance over declared temperature range
3.2 Timings
3.2.1 Time to establish or reset flame
3.2.2 Time to trip from fully heated position
3.2.3 Time to trip when disconnected from heated thermocouple
3.3 Gas leakage
3.3.1 External leakage
3.3.2 Internal leakage—Forward flow
3.3.3 Internal leakage—Reverse flow direction
3.4 Flow rate
3.4.1 Flow rate for a given pressure
3.5 Operating effort
3.5.1 Effort to open fully, close or reset unit
3.5.2 Torque or force to open or close valve
3.6 Mechanical strength
3.6.1 Flame safeguard capable of withstanding listed torque values
3.6.2 Flame safeguard capable of withstanding listed bending moments
3.7 Durability
3.7.1 Cycling test
Appendix A
Appendix B
B.1 Test medium and gases
B.1.1 Testing medium
B.1.2 Test gases
B.2 Samples
B.3 Lubricants
B.4 M.O.T. 2.1.3/3.1.2/3.7.1 – 01 Durability
B.4.1 Scope
B.4.2 Method
B.4.3 Apparatus
B.4.4 Materials
B.4.5 Procedure
B.4.6 Result
B.5 M.O.T. 2.1.4 – 84 Heat resistance
B.5.1 Scope
B.5.2 Method
B.5.3 Apparatus
B.5.4 Procedure
B.5.5 Result
B.6 M.O.T. 2.4.3 – 95 Markings and labels
B.6.1 Scope
B.6.2 Method
B.6.3 Apparatus
B.6.4 Materials
B.6.5 Procedure
B.6.6 Result
B.7 M.O.T. 3.3.1 – 02 External leakage
B.7.1 Scope
B.7.2 Method
B.7.3 Apparatus
B.7.4 Materials
B.7.5 Preparation of apparatus
B.7.6 Procedure
B.7.7 Result
B.8 M.O.T. 3.3.2 – 02 Internal leakage—Forward flow
B.8.1 Scope
B.8.2 Method
B.8.3 Apparatus
B.8.4 Materials
B.8.5 Preparation of apparatus
B.8.6 Procedure
B.8.7 Result
B.9 M.O.T. 3.3.3 – 96 Internal leakage—Reverse flow
B.9.1 Scope
B.9.2 Method
B.9.3 Apparatus
B.9.4 Materials
B.9.5 Preparation of apparatus
B.9.6 Procedure
B.9.7 Result
B.10 M.O.T. 3.4.1 – 84 Flow capacity
B.10.1 Scope
B.10.2 Method
B.10.3 Apparatus
B.10.4 Materials
B.10.5 Preparation of apparatus
B.10.6 Procedure
B.10.7 Calculations and reporting
B.10.8 Result
B.11 M.O.T. 3.5.1/3.5.2 – 84 Operating effort
B.11.1 Scope
B.11.2 Method
B.11.3 Apparatus
B.11.4 Materials
B.11.5 Preparation of apparatus
B.11.6 Procedure
B.11.7 Result
B.12 M.O.T. 3.6.1 – 84 Torque test
B.12.1 Scope
B.12.2 Method
B.12.3 Apparatus
B.12.4 Materials
B.12.5 Preparation of apparatus
B.12.6 Procedure
B.12.7 Result
B.13 M.O.T. 3.6.2 – 84 Bending moment test
B.13.1 Scope
B.13.2 Method
B.13.3 Apparatus
B.13.4 Preparation of apparatus
B.13.5 Procedure
B.13.6 Result
Appendix C
Appendix D
Amendment control sheet
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
Content history
[Current]
[Superseded]
AG 204-1998
AS 4620-2004 REC:2021
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