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AS 4628-2005
[Current]Specifies the uniform minimum requirements for manufacturers, designers, regulatory authorities, testing laboratories and similar organizations for the safety, performance and use of pressure and temperature limit devices for use with gas burners. These pressure and temperature limit devices are intended for use with natural gas, town gas, tempered liquefied petroleum gas and liquefied petroleum gas.
Published: 01/06/2005
Pages: 24
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope and definitions
1.1 Scope
1.2 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 materials
2.1.5 Parts in contact with water
2.1.6 Brass parts
2.1.7 Component parts materials selected to appropriate Standards
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 Prevention of accidental shift after calibration
2.2.7 Attachment of knobs, handles, dials and pointers
2.2.8 Springs
2.2.9 Securing of parts
2.2.10 Sharp edges
2.2.11 Holes for assembly or mounting
2.2.12 Permanent sealing of non-functional holes
2.2.13 Self-tapping screws
2.2.14 Construction of parts not covered by this Standard
2.2.15 Tightening of a gland or any other adjustments
2.3 Design
2.3.1 Fail-safe type
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 Venting
2.3.9 Protection of mechanism
2.3.10 Knobs and movable dials
2.3.11 Connections
2.3.12 Pressure test points
2.3.13 Connections suitable for rated working pressure
2.3.14 Secure mounting
2.3.15 Transparent covering
2.3.16 Limit device not to reset
2.3.17 Manually reset limit device
2.3.18 Limited adjustment in the field
2.3.19 Adjustable stop for set point not to be used for other adjustments
2.3.20 Items that may arc not to be located in gas containing compartment
2.3.21 Location or enclosure of electrical parts
2.3.22 Separation of operating parts from stowed wiring
2.4 Markings
2.4.1 General
2.4.2 Marking of 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
3.1.3 Limit device operation
3.2 Leakage
3.2.1 External leakage
3.3 Operating effort
3.3.1 Effort to reset unit
3.4 Mechanical strength
3.4.1 Device connections capable of withstanding listed torque values
3.5 Repeatability
3.5.1 Cycle test
3.6 Durability
3.6.1 Cycle test
3.6.2 Electrical load connections
3.6.3 Additional cycle test at 150% of manufacturer’s rated electrical load
3.6.4 Operation of limit device after cycle test
Appendix A
Appendix B
B1 Test medium and gases
B1.1 Test medium
B1.2 Test gases
B2 Samples
B3 Lubricants
B4 M.O.T. 2.1.3 – 95 Materials in contact with gas
B4.1 Scope
B4.2 Method
B4.3 Apparatus
B4.4 Materials
B4.5 Preparation of apparatus
B4.6 Procedure
B4.7 Result
B5 M.O.T. 2.3.16 – 82 Limit devices—Resetting operation
B5.1 Scope
B5.2 Method
B5.3 Apparatus
B5.4 Preparation of apparatus
B5.5 Procedure
B5.6 Result
B6 M.O.T. 2.3.17 – 82 Automatic tripping in a manually reset limit device
B6.1 Scope
B6.2 Method
B6.3 Apparatus
B6.4 Preparation of apparatus
B6.5 Procedure
B6.6 Result
B7 M.O.T. 2.4.3 – 95 Markings and labels
B7.1 Scope
B7.2 Method
B7.3 Apparatus
B7.4 Materials
B7.5 Procedure
B7.6 Result
B8 M.O.T. 3.1.3 – 94 Limit devices—Setting tolerances
B8.1 Scope
B8.2 Method
B8.3 Apparatus
B8.4 Preparation of apparatus
B8.5 Procedure
B8.6 Result
B9 M.O.T. 3.1.3 (A) – 82 Temperature resistance of pressure limit devices
B9.1 Scope
B9.2 Method
B9.3 Apparatus
B9.4 Materials
B9.5 Preparation of apparatus
B9.6 Procedure
B9.7 Result
B10 M.O.T. 3.1.3 (B) – 82 Temperature resistance of temperature limit devices
B10.1 Scope
B10.2 Method
B10.3 Apparatus
B10.4 Preparation
B10.5 Procedure
B10.6 Result
B11 M.O.T. 3.2.1 – 02 Leakage test of pressure limit device
B11.1 Scope
B11.2 Method
B11.3 Apparatus
B11.4 Materials
B11.5 Procedure
B11.6 Result
B12 M.O.T. 3.4.1 – 82 Torque test
B12.1 Scope
B12.2 Method
B12.3 Apparatus
B12.4 Materials
B12.5 Preparation of apparatus
B12.6 Procedure
B12.7 Result
B13 M.O.T. 3.6.1/2/3/4 – 01 Limit device durability
B13.1 Scope
B13.2 Method
B13.3 Apparatus
B13.4 Preparation of apparatus
B13.5 Procedure
B13.6 Result
Appendix C
Appendix D
Amendment control sheet
AS 4628—2005
Amendment No. 1 (2016)
Revised text
Cited references in this standard
Content history
[Current]
AS 4628-2005 REC:2025
AS 4628-2005 REC:2018
AG 213-1998
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