AS 5262-2011

1 - AS 5262-2011 LP GAS MOBILE INDUSTRIAL DIRECT FIRED AIR HEATERS
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 REFERENCED DOCUMENTS
7 - 1.3 DEFINITIONS
8 - 1.3.1 Appliance regulator
8 - 1.3.2 Approved
8 - 1.3.3 Authority
8 - 1.3.4 Authority having jurisdiction
8 - 1.3.5 Automatic burner
8 - 1.3.6 Automatic ignition
8 - 1.3.7 Automatic operation
8 - 1.3.8 Calibration
8 - 1.3.9 Certifying body
8 - 1.3.10 Combination gas control
8 - 1.3.11 Combustible construction
8 - 1.3.12 Combustion products
8 - 1.3.13 Cut-off
8 - 1.3.14 Determined gas consumption
9 - 1.3.15 Direct gas-fired air heater
9 - 1.3.16 Direct ignition device
9 - 1.3.17 Fitting
9 - 1.3.18 Flame abnormality
9 - 1.3.19 Flame detector
9 - 1.3.20 Flame establishment period
9 - 1.3.21 Flame failure response time
9 - 1.3.22 Flame proving period
9 - 1.3.23 Flame safeguard
9 - 1.3.24 Flame safeguard system
9 - 1.3.25 Flue gases
9 - 1.3.26 Forced draught burner
9 - 1.3.27 Gas
10 - 1.3.28 Heating value, gross (at constant pressure)
10 - 1.3.29 Hose assembly
10 - 1.3.30 Interlock
10 - 1.3.31 Intermittent pilot
10 - 1.3.32 Interrupted pilot
10 - 1.3.33 Limit device
10 - 1.3.34 Lockout
10 - 1.3.35 Lock-up pressure
10 - 1.3.36 Low gas pressure detector
10 - 1.3.37 LP Gas
11 - 1.3.38 Manual ignition
11 - 1.3.39 Mobile appliance
11 - 1.3.40 Nominal gas consumption
11 - 1.3.41 Nominal outlet pressure
11 - 1.3.42 Nominal test point pressure
11 - 1.3.43 Permanent pilot
11 - 1.3.44 Piezo electric ignition
11 - 1.3.45 Pilot
11 - 1.3.46 Programmable Electronic System (PES)
12 - 1.3.47 Programming flame safeguard
12 - 1.3.48 Rated working pressure
12 - 1.3.49 Regulator
12 - 1.3.50 Relative density
12 - 1.3.51 Safety shut-down
12 - 1.3.52 Safety shut-off system
12 - 1.3.53 Safety shut-off valve
12 - 1.3.54 Set pressure
12 - 1.3.55 Specific gravity
12 - 1.3.56 Stoichiometric combustion
12 - 1.3.57 Temperature limit device
12 - 1.3.58 Temperature sensing element
12 - 1.3.59 Thermostat
12 - 1.3.60 Thermostat bypass
13 - 1.3.61 Thermostat valve
13 - 1.3.62 Valve
13 - 1.3.63 Valve train
13 - 1.3.64 Vent limiter
13 - 1.3.65 Wobbe index
15 - SECTION 2 DESIGN AND CONSTRUCTION
15 - 2.1 GENERAL
15 - 2.1.1 Preliminary specification
15 - 2.1.2 Physical inspection
15 - 2.1.3 Certification of safety components
15 - 2.1.4 Programmable electronic systems
15 - 2.1.5 Manual shut-off gas valves
15 - 2.1.6 Compliance of electrical components
15 - 2.1.7 Fuel storage container
15 - 2.1.8 Sharp projections or edges
15 - 2.1.9 Safety, substantiality and durability
16 - 2.1.10 Displacement of parts
16 - 2.1.11 Means of support
16 - 2.1.12 Enclosures for gas trains
16 - 2.1.13 Burner valve train
16 - 2.1.14 Valve train components
16 - 2.1.15 Manual shut-off valve
16 - 2.1.16 Pipework
16 - 2.1.17 Support for manual shut-off valve
16 - 2.1.18 Construction of joints
16 - 2.1.19 Adjustable devices
17 - 2.1.20 Limit devices
17 - 2.1.21 Provision of positive locking devices
17 - 2.1.22 Prevention of manual contact with fan impeller
17 - 2.1.23 Gas pressure test point
17 - 2.2 MATERIALS AND STANDARDS
17 - 2.2.1 General
17 - 2.2.2 Materials in contact with gas
17 - 2.2.3 Strength, durability and suitability of materials
17 - 2.2.4 Zinc based alloys-general
17 - 2.2.5 Zinc based alloys-exposure to water vapour
17 - 2.2.6 Materials subject to heat or corrosion
18 - 2.2.7 Fittings
18 - 2.3 ELECTRICAL SYSTEMS
18 - 2.3.1 Accessibility to electrical components
18 - 2.3.2 Connection of electrical components
18 - 2.3.3 Protection of low voltage electrical components and wiring
18 - 2.3.4 Outdoor installation
18 - 2.3.5 Motor bearing suitability
18 - 2.3.6 Control circuit design
18 - 2.3.7 Failure of component
18 - 2.4 INSTALLATION REQUIREMENTS
18 - 2.5 MAINTENANCE REQUIREMENTS
18 - 2.5.1 Special tools
18 - 2.5.2 Dismantling and replacement by the operator
19 - 2.5.3 Insertion and removal of screw-in jets
19 - 2.5.4 Assembly and attachment of handles, dials and pointers
19 - 2.5.5 Accessibility for adjustment
19 - 2.5.6 Accessibility for replacement
19 - 2.5.7 Accessibility of pilot flame detector
19 - 2.5.8 Inaccessible nuts or bolts
20 - 2.6 PRESSURE REGULATORS
20 - 2.6.1 Provision of a pressure regulator
20 - 2.6.2 Type of pressure regulator
20 - 2.6.3 Provision of a separate pressure regulator
20 - 2.6.4 Provision of a vent limiting device
20 - 2.6.5 Positioning of pressure regulators
20 - 2.6.6 Adjustments on pressure regulators
20 - 2.7 GAS CONTROLS AND FLAME SAFEGUARDS
20 - 2.7.1 Accessibility of controls and working parts
20 - 2.7.2 Accidental change of settings of valves, dials and pointers
20 - 2.7.3 Markings for controls, dials and gauges
20 - 2.7.4 Indication of functions on manual gas valves
20 - 2.7.5 Type of manual shut-off valves
20 - 2.7.6 Use of limit devices
21 - 2.7.7 Provision of flame safeguard
21 - 2.7.8 Supervision of pilots
21 - 2.7.9 Main burner shut-off valves
21 - 2.7.10 Fitting of double block safety shut-off valve
21 - 2.7.11 Fitting of Class 1 valves
21 - 2.7.12 Start gas supply
21 - 2.7.13 Fitting of safety shut-off system
21 - 2.7.14 No bypassing of safety shut-off valve system
21 - 2.7.15 Protection of required safety controls
21 - 2.8 COMBUSTION AIR SUPPLY AND CONTROLS
21 - 2.8.1 Combustion air supply equipment
21 - 2.8.2 Combustion air flow proving interlock
22 - 2.9 IGNITION, PILOTS AND MAIN BURNERS
22 - 2.9.1 Provision of manual shut-off valve for pilot burner
22 - 2.9.2 Provision of manual shut-off valve for main burner
22 - 2.9.3 Viewing of burner flames
22 - 2.9.4 Ensuring burner or pilot is alight
22 - 2.9.5 Support of pilots, igniters and flame sensing devices
22 - 2.9.6 Securing of burners
22 - 2.9.7 Support of limit devices
22 - 2.9.8 Protection of ports and injectors
22 - 2.9.9 Design and location of means for ignition
22 - 2.9.10 Location of pilot burners
22 - 2.9.11 Aeration adjustment for Universal LP Gas appliances
23 - 2.10 MARKINGS
23 - 2.10.1 Provision of marking plate(s)
23 - 2.10.2 Information on marking plate(s)
23 - 2.10.3 Provision of wiring diagram
23 - 2.10.4 Provision of label relating to use
23 - 2.10.5 Provision of label relating to ventilation
23 - 2.10.6 Provision of warning label
24 - 2.10.7 Gas valve ‚OFF™ position
24 - 2.11 INSTRUCTIONS
24 - 2.11.1 General
24 - 2.11.2 Provision of operating instructions
24 - 2.11.3 Content of operating and servicing instructions
25 - 2.11.4 Dimensions
26 - SECTION 3 PRELIMINARY TESTS
26 - 3.1 GENERAL REQUIREMENTS
26 - 3.1.1 Introduction
26 - 3.1.2 Test gases
26 - 3.2 PREPARATION FOR TESTING
26 - 3.2.1 Electrical safety requirements (earth leakage)
26 - 3.2.2 Setting up appliance for testing
26 - 3.2.3 Appliance regulators not to be moved during testing
26 - 3.2.4 Protection from accidental draughts
27 - 3.2.5 Prevention of gas flow variation
27 - 3.2.6 Gas pressure and gas volume test equipment
27 - 3.3 GAS LEAKAGE
27 - 3.4 GAS CONSUMPTION
27 - 3.4.1 Tolerance on determined gas consumption
27 - 3.4.2 Determined gas consumption of permanent pilots
27 - 3.5 LOW GAS PRESSURE DETECTORS
27 - 3.5.1 Installation of low gas pressure detector
27 - 3.5.2 Function of low gas pressure detector
28 - 3.6 IGNITION AND SAFETY SHUT-OFF SYSTEMS
28 - 3.6.1 General
28 - 3.6.2 Ignition at reduced pilot rate
28 - 3.6.3 Flame travel with multi-port pilot
28 - 3.6.4 Gas igniting freely
28 - 3.6.5 No flames flashing outside the combustion chamber
28 - 3.6.6 Pilot burner stability under main burner operation
28 - 3.6.7 Prevention of flame simulation
28 - 3.6.8 Energizing of valves
28 - 3.6.9 Use of two flame detectors with intermittent or permanent pilot
28 - 3.6.10 Cessation of ignition spark
28 - 3.6.11 Check of integral circuitry in flame safeguard systems
28 - 3.6.12 Programming system
29 - 3.6.13 Lockout of gas supply
29 - 3.6.14 Flame failure
29 - 3.6.15 Shut-off time for safety shut-off system
30 - SECTION 4 COMBUSTION TESTS
30 - 4.1 INTRODUCTION
30 - 4.2 SATISFACTORY COMBUSTION
30 - 4.3 TESTING AT MANUFACTURER'S RATED AIR THROUGHPUT
30 - 4.4 TESTING AT AIR FLOW JUST IN EXCESS OF SETTING ON AIR FLOW DEVICE
31 - 4.5 COMBUSTION PRODUCTS LIMITS
32 - SECTION 5 PERFORMANCE TESTS
32 - 5.1 AIR DISCHARGE TEMPERATURE
32 - 5.2 COMBUSTION AIR SUPPLY
32 - 5.3 INTERLOCK SYSTEMS
32 - 5.3.1 General
32 - 5.3.2 Interlocks to ensure safe ignition conditions
32 - 5.3.3 Interlocks to ensure safe reignition conditions
33 - 5.4 SHUT-DOWN
33 - 5.4.1 Safety
33 - 5.4.2 Safety shut-down
33 - 5.5 TEMPERATURE HAZARDS
33 - 5.5.1 Temperature limits
34 - 5.5.2 Fitting of temperature limit device
34 - 5.6 HEAT RESISTANCE
34 - 5.7 SPECIFICATIONS
35 - APPENDIX A - FIGURES A1 TO A3
38 - APPENDIX B - METHODS OF TEST
38 - B1 M.O.T. 2.2.5-ZINC ALLOY TEST
38 - B1.1 Scope
38 - B1.2 Principle
38 - B1.3 Apparatus
38 - B1.4 Procedure
38 - B1.5 Result
39 - B2 M.O.T. 2.7/2.10-MARKINGS AND LABELS
39 - B2.1 Scope
39 - B2.2 Principle
39 - B2.3 Apparatus
39 - B2.4 Materials
39 - B2.5 Procedure
39 - B2.6 Result
40 - B3 M.O.T. 3.3.1/3.3.2-GAS LEAKAGE
40 - B3.1 Scope
40 - B3.2 Principle
40 - B3.3 Apparatus
40 - B3.4 Preparation of apparatus
40 - B3.5 Procedure
40 - B3.6 Result
41 - B4 M.O.T. 3.4.1-GAS CONSUMPTION
41 - B4.1 Scope
41 - B4.2 Principle
41 - B4.3 Apparatus
41 - B4.4 Materials
41 - B4.5 Preparation of apparatus
41 - B4.6 Procedure
41 - B4.7 Result
42 - B5 M.O.T. 3.6.1/3.6.2-IGNITION TESTS
42 - B5.1 Scope
42 - B5.2 Principle
42 - B5.3 Apparatus
42 - B5.4 Materials
42 - B5.5 Preparation of apparatus
42 - B5.6 Procedure
42 - B5.7 Result
43 - B6 M.O.T. 3.6.2-IGNITION OF A BURNER PROTECTED BY A FLAME SAFEGUARD
43 - B6.1 Scope
43 - B6.2 Principle
43 - B6.3 Apparatus
43 - B6.4 Materials
43 - B6.5 Preparation of apparatus
43 - B6.6 Procedure
43 - B6.7 Result
44 - B7 M.O.T. 3.6.15-OPERATION OF FLAME SAFEGUARD SYSTEM
44 - B7.1 Scope
44 - B7.2 Principle
44 - B7.3 Materials
44 - B7.4 Apparatus
44 - B7.5 Preparation of apparatus
44 - B7.6 Procedure
44 - B7.7 Result
45 - B8 M.O.T. 4.3/4.4/4.5(a) AND 3.5.2-OPERATION OF LOW GAS PRESSURE CUT-OFF DEVICE DETERMINATION OF CO, CO2, NO2...
45 - B8.1 Scope
45 - B8.2 Principle
45 - B8.3 Apparatus
45 - B8.4 Materials
45 - B8.5 Preparation of apparatus
46 - B8.6 Procedure
46 - B8.7 Result
47 - B9 M.O.T. 4.3/4.4/4.5(b)-DETERMINATION OF FORMALDEHYDE CONCENTRATION IN DISCHARGE PRODUCTS
47 - B9.1 Scope
47 - B9.2 Principle
47 - B9.3 Apparatus
47 - B9.4 Materials
48 - B9.5 Preparation of apparatus
48 - B9.6 Procedure
49 - B9.7 Result
50 - B10 M.O.T. 5.1-DISCHARGE TEMPERATURES
50 - B10.1 Scope
50 - B10.2 Principle
50 - B10.3 Apparatus
50 - B10.4 Materials
50 - B10.5 Preparation of apparatus
50 - B10.6 Procedure
50 - B10.7 Result
51 - B11 M.O.T. 5.2-FLAME ABNORMALITY ON PROGRESSIVE AIR SUPPLY RESTRICTION
51 - B11.1 Scope
51 - B11.2 Principle
51 - B11.3 Apparatus
51 - B11.4 Materials
51 - B11.5 Preparation of apparatus
51 - B11.6 Procedure
51 - B11.7 Result
52 - B12 M.O.T. 5.5.1-TEMPERATURE HAZARDS
52 - B12.1 Scope
52 - B12.2 Principle
52 - B12.3 Apparatus
52 - B12.4 Materials
52 - B12.5 Preparation of apparatus
52 - B12.6 Procedure
52 - B12.7 Result
54 - B13 M.O.T. 5.5.1(h)-TEMPERATURE HAZARDS-ELECTRIC MOTORS
54 - B13.1 Scope
54 - B13.2 Principle
54 - B13.3 Apparatus
54 - B13.4 Materials
54 - B13.5 Preparation of apparatus
54 - B13.6 Procedure
55 - B13.7 Calculations
55 - B13.8 Result
56 - B14 M.O.T. 5.5.2-HEATER CASING-MAXIMUM TEMPERATURE TEST
56 - B14.1 Scope
56 - B14.2 Principle
56 - B14.3 Apparatus
56 - B14.4 Materials
56 - B14.5 Preparation of apparatus
56 - B14.6 Procedure
56 - B14.7 Result
57 - B15 M.O.T. 5.6-HEAT RESISTANCE
57 - B15.1 Scope
57 - B15.2 Principle
57 - B15.3 Apparatus
57 - B15.4 Materials
57 - B15.5 Preparation of apparatus
57 - B15.6 Procedure
57 - B15.7 Result
58 - APPENDIX C - MAINTENANCE SCHEDULE AND SERVICING INSTRUCTIONS
58 - C1 GUIDELINES FOR SERVICING INSTRUCTIONS
58 - C2 MAINTENANCE SCHEDULE
60 - C3 WRITTEN APPLIANCE SPECIFICATIONS
63 - APPENDIX D - DETERMINATION OF FORMALDEHYDE CONCENTRATION IN DISCHARGE PRODUCTS
63 - D1 SOURCE
63 - D2 PREPARATION OF CHEMICAL SOLUTIONS
64 - D3 PREPARATION OF SOLUTIONS FOR TEST
64 - D4 PREPARATION OF A STANDARD CURVE
65 - APPENDIX E - AIR DISCHARGE SAMPLING AND TEMPERATURE MEASUREMENT
68 - APPENDIX F - APPLIANCE TEST REPORT

This Standard specifies requirements for new mobile industrial direct fired air heaters, constructed entirely from new materials and components and intended for use with liquefied petroleum gas (LP Gas) with gas consumption greater than 50 MJ/h and not exceeding 500 MJ/h.

Originated as AG 404 1988.
Revised and redesignated as AS 5262 2011.