AS/NZS 1425:2003

1 - AS/NZS 1425:2003 LP GAS FUEL SYSTEMS FOR VEHICLE ENGINES
4 - PREFACE
5 - CONTENTS
8 - SECTION 1 SCOPE AND GENERAL
8 - 1.1 SCOPE AND APPLICATION
8 - 1.1.1 Scope
8 - 1.1.2 Application
8 - 1.2 OBJECTIVE
8 - 1.3 REFERENCED DOCUMENTS
8 - 1.4 NEW DESIGNS AND INNOVATIONS
8 - 1.5 DEFINITIONS
9 - 1.5.1 Approved, approval
9 - 1.5.2 Authority
9 - 1.5.3 Authorized person
9 - 1.5.4 Automatic fill limiter
9 - 1.5.5 Automatic fuel shut-off device
9 - 1.5.6 Capacity (of a container)
9 - 1.5.7 Certified kit
9 - 1.5.8 Compartment
9 - 1.5.9 Container
9 - 1.5.10 Contents gauge
10 - 1.5.11 Double non-return valve
10 - 1.5.12 Excess-flow valve
10 - 1.5.13 Fill line
10 - 1.5.14 Fixed liquid level gauge
10 - 1.5.15 Fuel
10 - 1.5.16 Fuel filter
10 - 1.5.17 Fuel injector
10 - 1.5.18 Fuel service line
10 - 1.5.19 Gas-air mixer
10 - 1.5.20 Hydrostatic relief valve
10 - 1.5.21 Ignition source
10 - 1.5.22 Internal (component)
11 - 1.5.23 Licensed installer
11 - 1.5.24 LP Gas
11 - 1.5.25 Maximum permitted filling level
11 - 1.5.26 May
11 - 1.5.27 Non return valve
11 - 1.5.28 POL coupling
11 - 1.5.29 Pressure
11 - 1.5.30 Professional engineer
11 - 1.5.31 Regulator
11 - 1.5.32 Relief valve
12 - 1.5.33 Removable container
12 - 1.5.34 Safety coupling
12 - 1.5.35 Safety valve
12 - 1.5.36 Service valve
12 - 1.5.37 Shall
12 - 1.5.38 Should
12 - 1.5.39 Sub-compartment
12 - 1.5.40 Vaporizer
12 - 1.6 VEHICLE MODIFICATIONS
13 - 1.7 MINOR ALTERATIONS
13 - 1.8 ENGINE MANAGEMENT SYSTEM
14 - 1.9 APPROVED EQUIPMENT
14 - 1.10 PREVIOUSLY USED EQUIPMENT
14 - 1.11 LP GAS WITHDRAWAL FROM AUTOMOTIVE SYSTEMS
14 - 1.12 DECOMMISSIONING OF LP GAS FUEL SYSTEM
14 - 1.13 WORKING AREA AND SAFE PRACTICES
14 - 1.14 REGULATORY AGENCIES
15 - SECTION 2 COMPONENTS
15 - 2.1 GENERAL SUITABILITY
15 - 2.1.1 General
15 - 2.1.2 Suitability for pressure
15 - 2.2 MOVING PARTS
15 - 2.3 SUITABILITY FOR INSTALLATION
16 - 2.4 MODIFICATION
16 - 2.5 METALS
16 - 2.6 NON-METALS
17 - SECTION 3 CONTAINER SUB-ASSEMBLY
17 - 3.1 APPLICATION
17 - 3.2 CONTAINER
17 - 3.2.1 General
17 - 3.2.2 Use of removable containers
17 - 3.3 COMPONENTS FOR FIXED CONTAINERS
17 - 3.4 COMPONENTS FOR REMOVABLE CONTAINERS
18 - 3.5 COMPONENT SUITABILITY
18 - 3.6 FILLING CONNECTION
18 - 3.7 FILLER NON-RETURN VALVE SYSTEM
18 - 3.7.1 Direct filling system
19 - 3.7.2 Remote filling system
19 - 3.7.3 Internal non-return valve
19 - 3.7.4 Filler cap
19 - 3.7.5 Filling point location
20 - 3.8 AUTOMATIC FILL LIMITER (AFL)
20 - 3.8.1 Design
20 - 3.8.2 Performance
20 - 3.8.3 Durability
21 - 3.9 FIXED LIQUID LEVEL GAUGE
21 - 3.9.1 General
21 - 3.10 CONTENTS GAUGE
21 - 3.11 EXCESS-FLOW VALVE
21 - 3.12 SERVICE VALVE
21 - 3.13 AUTOMATIC FUEL SHUT-OFF DEVICE AT CONTAINER
22 - 3.14 FUEL FILTER
22 - 3.15 SAFETY VALVE
22 - 3.15.1 General
23 - 3.15.2 Safety valve discharge
23 - 3.15.3 Safety valve discharge piping
24 - 3.16 LOCATION OF CONTAINER COMPONENTS
24 - 3.17 COMPARTMENTS AND SUB-COMPARTMENTS
24 - 3.17.1 Internal containers
24 - 3.17.2 Construction
25 - 3.17.3 Ventilation
25 - 3.17.4 Conduits and ducts
26 - 3.18 MOUNTING OF FUEL CONTAINER
26 - 3.18.1 Correct orientation
26 - 3.18.2 Access to valves
26 - 3.18.3 Attachment to vehicle
29 - 3.18.4 Multiple containers
29 - 3.19 CONTAINER LOCATION, GROUND CLEARANCES
31 - 3.20 PROTECTION
32 - 3.21 HEAT SHIELDING
32 - 3.22 SUITABILITY FOR HAZARDOUS ZONES
33 - SECTION 4 FUEL SERVICE LINE
33 - 4.1 APPLICATION
33 - 4.2 RIGID PIPING
33 - 4.2.1 General
33 - 4.2.2 Suitability of rigid piping
33 - 4.3 FLEXIBLE PIPING (HOSE AND HOSE ASSEMBLY)
33 - 4.4 JOINTS AND CONNECTIONS
34 - 4.5 INSTALLATION AND PROTECTION
35 - 4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
35 - 4.7 MULTIPLE CONTAINER INSTALLATIONS
35 - 4.8 HYDROSTATIC RELIEF VALVE
35 - 4.9 TRAILERS AND SEMITRAILERS
35 - 4.10 PREVIOUSLY USED EQUIPMENT
36 - 4.11 LP GAS FUEL PIPING FOR PRESSURE NOT EXCEEDING 100 kPa
36 - 4.12 LP GAS FUEL PIPING FOR PRESSURE NOT EXCEEDING 450 kPa
37 - SECTION 5 FUEL CONTROL EQUIPMENT
37 - 5.1 APPLICATION
37 - 5.2 FUEL FILTER
37 - 5.3 AUTOMATIC FUEL SHUT-OFF DEVICE AT REGULATOR
38 - 5.4 VAPORIZER
38 - 5.5 REGULATOR
38 - 5.6 INSTALLATION OF VAPORIZER AND REGULATOR
38 - 5.7 LP GAS FUEL INJECTOR OR OTHER GAS METERING DEVICE
38 - 5.8 GASŒAIR MIXER
39 - 5.9 FUEL SELECTOR
39 - 5.9.1 General
39 - 5.9.2 Optional fuel type
39 - 5.9.3 Bypass relief device
39 - 5.9.4 Fuel selection control
39 - 5.10 PETROL SYSTEM MODIFICATIONS
40 - 5.11 ELECTRICAL WIRING
40 - 5.12 ENGINE MANAGEMENT SYSTEM
41 - SECTION 6 INSPECTION TESTING AND COMMISSIONING
41 - 6.1 APPLICATION
41 - 6.2 USED EQUIPMENT
41 - 6.3 MODIFICATIONS AND REPAIRS
41 - 6.4 PRECAUTIONS
42 - 6.5 INSPECTION
42 - 6.6 LEAK DETECTION
42 - 6.7 CONTAINER SUB-ASSEMBLY LEAK TEST
42 - 6.7.1 General
42 - 6.7.2 Leak test
43 - 6.8 INSTALLATION TEST
43 - 6.8.1 General
43 - 6.8.2 Gastightness of compartments and sub-compartments
43 - 6.8.3 Leak testing of gas system
43 - 6.8.4 Test of automatic fill limiter
43 - 6.8.5 Test of fuel control device
43 - 6.8.6 Coolant system tests
43 - 6.8.7 Visual inspection
44 - 6.9 PERIODIC INSPECTION
44 - 6.9.1 General
44 - 6.9.2 System check
46 - 6.10 EXCESS FLOW VALVE TEST
47 - 6.11 NON-RETURN VALVE TEST
47 - 6.12 AUTOMATIC FILL LIMITER TEST
47 - 6.13 TESTING OF AUTOMATIC FUEL SHUT-OFF DEVICE
48 - SECTION 7 CERTIFICATION, COMPLIANCE PLATE, MARKINGS AND LABELS
48 - 7.1 APPLICATION
48 - 7.2 CERTIFICATION
48 - 7.3 COMPLIANCE PLATE
49 - 7.4 LABELS AND MARKINGS
49 - 7.4.1 Filler markings
49 - 7.4.2 Outlet markings
49 - 7.4.3 Vehicle identification
49 - 7.4.4 Controls
49 - 7.4.5 Access hatch
50 - 7.5 OPERATING INSTRUCTIONS
51 - APPENDIX A - LIST OF REFERENCED DOCUMENTS
53 - APPENDIX B - REGULATING AGENCY INFORMATION
56 - APPENDIX C - LEAK DETECTION METHODS
56 - C1 SCOPE
56 - C2 COMBUSTIBLE-GAS DETECTOR
56 - C3 TRACE-GAS DETECTORS
56 - C4 FOAMING AGENTS
57 - C5 TOTAL IMMERSION
57 - C6 VISUAL INSPECTION
58 - APPENDIX D - PROCEDURES FOR DEMONSTRATING COMPLIANCE WITH EXHAUST EMISSION STANDARDS
58 - D1 SCOPE AND VEHICLE SELECTION
58 - D1.1 Scope
59 - D1.2 Use of certified kits on engine/vehicle variants
60 - D2 ADR79/00 VEHICLES
60 - D2.1 General requirements
60 - D2.2 Testing requirements
61 - D2.3 Documentation and installation requirements
61 - D3 ADR79/01 VEHICLES
61 - D3.1 General requirements
61 - D3.2 Testing requirements
62 - D3.3 Documentation and installation requirements
63 - D4 ADR70/00 VEHICLES
63 - D4.1 General requirements
63 - D4.2 Testing requirements
64 - D4.3 Documentation and installation requirements
65 - D5 ADR80/00 AND ADR80/01 VEHICLES
65 - D5.1 General requirements
65 - D5.2 Testing requirements
65 - D5.3 Documentation and installation requirements

Sets out requirements for liquefied petroleum gas (LP Gas) fuel systems for engines mounted on motor vehicles, either for the propulsion of the vehicles or for driving some auxiliary function.

This Standard specifies requirements for liquefied petroleum gas (LP Gas) fuel systems for engines mounted on motor vehicles, either for the propulsion of the vehicles or for driving some auxiliary function, e.g. a mixer or a pump. It provides requirements for the design and construction of component parts, and for their installation in vehicles, and for tests, commissioning, and periodic inspection.This Standard does not apply to forklifts, floor sweepers, polishers, tow tractors, elevating work platforms and industrial stationary engines and to other LP Gas usage, such as the gas supply system for appliances in caravans, mobile homes or for the propulsion of marine craft.This Standard does not cover the areas where major structural modifications are to be carried out to the vehicle (major structural modifications are those not defined in Clause 1.6). Prior to commencement of such work, guidance should be sought from the vehicle manufacturer or a professional engineer who is experienced in the automotive disciplines.

First published as AS 1425-1973.
Second edition 1979.
Third edition 1982.
Fourth edition 1989.
First published in New Zealand in part as part of NZS 5422.1:1980.
Second edition 1987.
NZS 5422.3 first published 1991.
AS 1425-1989, NZS 5422.1:1987 and part of NZS 5422.3-1991 jointly revised, amalgamated and designated AS/NZS 1425:1999.
Sixth edition 2003.