AS/NZS 1425:1999

1 - AS/NZS 1425:1999 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
9 - 1.5 DEFINITIONS
9 - 1.5.1 Approved, approval
9 - 1.5.2 Authorized person
9 - 1.5.3 Authority
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 Compartment
9 - 1.5.8 Container
9 - 1.5.9 Contents gauge
9 - 1.5.10 Double non-return valve
9 - 1.5.11 Excess-flow valve
9 - 1.5.12 Fixed liquid level gauge
9 - 1.5.13 Fuel filter
10 - 1.5.14 Fuel service line
10 - 1.5.15 Gas-air mixer
10 - 1.5.16 Hydrostatic relief valve
10 - 1.5.17 Ignition source
10 - 1.5.18 Internal (component)
10 - 1.5.19 Licensed installer
10 - 1.5.20 LP Gas
10 - 1.5.21 Maximum permitted filling level
10 - 1.5.22 May
10 - 1.5.23 Non return valve
10 - 1.5.24 POL coupling
10 - 1.5.25 Pressure
10 - 1.5.26 Professional engineer
10 - 1.5.27 Regulator
11 - 1.5.28 Relief valve
11 - 1.5.29 Removable container
11 - 1.5.30 Safety coupling
11 - 1.5.31 Safety valve
11 - 1.5.32 Service valve
11 - 1.5.33 Shall
11 - 1.5.34 Should
11 - 1.5.35 Sub-compartment
11 - 1.5.36 Vaporizer
11 - 1.6 VEHICLE MODIFICATIONS
12 - 1.7 MINOR ALTERATIONS
12 - 1.8 ENGINE MANAGEMENT SYSTEM
12 - 1.9 APPROVED EQUIPMENT
12 - 1.10 PREVIOUSLY USED EQUIPMENT
12 - 1.11 LP GAS WITHDRAWAL FROM AUTOMOTIVE SYSTEMS
12 - 1.12 WORKING AREA AND SAFE PRACTICES
12 - 1.13 AGENCIES
13 - SECTION 2 COMPONENTS
13 - 2.1 GENERAL SUITABILITY
13 - 2.1.1 General
13 - 2.1.2 Suitability for pressure
13 - 2.2 MOVING PARTS
13 - 2.3 SUITABILITY FOR INSTALLATION
13 - 2.4 MODIFICATION
14 - 2.5 METALS
14 - 2.6 NON-METALS
15 - SECTION 3 CONTAINER SUB-ASSEMBLY
15 - 3.1 APPLICATION
15 - 3.2 CONTAINER
15 - 3.2.1 General
15 - 3.2.2 Use of removable containers
15 - 3.3 COMPONENTS FOR FIXED CONTAINERS
15 - 3.4 COMPONENTS FOR REMOVABLE CONTAINERS
16 - 3.5 COMPONENT SUITABILITY
16 - 3.6 FILLING CONNECTION
16 - 3.7 FILLER NON-RETURN VALVE SYSTEM
16 - 3.7.1 Direct filling system
16 - 3.7.2 Remote filling system
17 - 3.7.3 Internal non-return valve
17 - 3.7.4 Filler cap
17 - 3.7.5 Filling point location
18 - 3.8 AUTOMATIC FILL LIMITER (AFL)
18 - 3.8.1 Design
18 - 3.8.2 Performance
18 - 3.8.3 Durability
18 - 3.9 FIXED LIQUID LEVEL GAUGE
18 - 3.9.1 General
19 - 3.9.2 Gas-bleed type
19 - 3.9.3 Sight-glass type
19 - 3.10 CONTENTS GAUGE
19 - 3.11 EXCESS-FLOW VALVE
19 - 3.12 SERVICE VALVE
19 - 3.13 AUTOMATIC FUEL SHUT-OFF DEVICE AT CONTAINER
20 - 3.14 FUEL FILTER
20 - 3.15 SAFETY VALVE
20 - 3.15.1 General
20 - 3.15.2 Safety valve discharge
21 - 3.15.3 Safety valve discharge piping
21 - 3.16 LOCATION OF CONTAINER COMPONENTS
22 - 3.17 COMPARTMENTS AND SUB-COMPARTMENTS
22 - 3.17.1 Internal containers
22 - 3.17.2 Construction
22 - 3.17.3 Ventilation
23 - 3.17.4 Conduits and ducts
24 - 3.18 MOUNTING OF FUEL CONTAINER
24 - 3.18.1 Correct orientation
24 - 3.18.2 Access to valves
24 - 3.18.3 Attachment to vehicle
26 - 3.18.4 Multiple containers
27 - 3.19 CONTAINER LOCATION, GROUND CLEARANCES
29 - 3.20 PROTECTION
30 - 3.21 HEAT SHIELDING
30 - 3.22 SUITABILITY FOR HAZARDOUS ZONES
31 - SECTION 4 FUEL SERVICE LINE
31 - 4.1 APPLICATION
31 - 4.2 RIGID PIPING
31 - 4.2.1 General
31 - 4.2.2 Suitability of rigid piping
31 - 4.3 FLEXIBLE PIPING (HOSE AND HOSE ASSEMBLY)
31 - 4.4 JOINTS AND CONNECTIONS
32 - 4.5 INSTALLATION AND PROTECTION
33 - 4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
33 - 4.7 MULTIPLE CONTAINER INSTALLATIONS
33 - 4.8 HYDROSTATIC RELIEF VALVE
33 - 4.9 TRAILERS AND SEMITRAILERS
33 - 4.10 PREVIOUSLY USED EQUIPMENT
33 - 4.11 LP GAS FUEL PIPING FOR PRESSURE NOT EXCEEDING 100 kPa
34 - SECTION 5 FUEL CONTROL EQUIPMENT
34 - 5.1 APPLICATION
34 - 5.2 FUEL FILTER
34 - 5.3 AUTOMATIC FUEL SHUT-OFF DEVICE AT REGULATOR
35 - 5.4 VAPORIZER
35 - 5.5 REGULATOR
35 - 5.6 INSTALLATION OF VAPORIZER AND REGULATOR
35 - 5.7 GAS-AIR MIXER
35 - 5.8 FUEL SELECTOR
35 - 5.8.1 General
35 - 5.8.2 Dual fuel change over system
36 - 5.8.3 Optional fuel type
36 - 5.8.4 Bypass relief device
36 - 5.8.5 Fuel selection control
36 - 5.9 PETROL SYSTEM MODIFICATIONS
36 - 5.10 ELECTRICAL WIRING
37 - 5.11 ENGINE MANAGEMENT SYSTEM
38 - SECTION 6 INSPECTION TESTING AND COMMISSIONING
38 - 6.1 APPLICATION
38 - 6.2 USED EQUIPMENT
38 - 6.3 MODIFICATIONS AND REPAIRS
38 - 6.4 PRECAUTIONS
39 - 6.5 INSPECTION
39 - 6.6 LEAK DETECTION
39 - 6.7 CONTAINER SUB-ASSEMBLY LEAK TEST
39 - 6.7.1 General
39 - 6.7.2 Leak test
40 - 6.8 INSTALLATION TEST
40 - 6.8.1 General
40 - 6.8.2 Gastightness of compartments and sub-compartment
40 - 6.8.3 Leak testing of gas system
40 - 6.8.4 Test of automatic fill limiter
40 - 6.8.5 Test of fuel control device
40 - 6.8.6 Coolant system tests
40 - 6.8.7 Visual inspection
41 - 6.9 PERIODIC INSPECTION
41 - 6.9.1 General
41 - 6.9.2 System check
43 - 6.10 EXCESS FLOW VALVE TEST
43 - 6.11 NON-RETURN VALVE TEST
43 - 6.12 AUTOMATIC FILL LIMITER TEST
43 - 6.13 TESTING OF AUTOMATIC FUEL SHUT-OFF DEVICE
44 - SECTION 7 CERTIFICATION, COMPLIANCE PLATE, MARKINGS AND LABELS
44 - 7.1 APPLICATION
44 - 7.2 CERTIFICATION
44 - 7.3 COMPLIANCE PLATE
44 - 7.4 LABELS AND MARKINGS
44 - 7.4.1 Filler markings
44 - 7.4.2 Outlet markings
45 - 7.4.3 Vehicle identification
45 - 7.4.4 Controls
45 - 7.4.5 Access hatch
45 - 7.5 OPERATING INSTRUCTIONS
46 - APPENDIX A - LIST OF REFERENCED DOCUMENTS
47 - APPENDIX B - REGULATING AGENCY INFORMATION
49 - APPENDIX C - LEAK DETECTION METHODS
49 - C1 SCOPE
49 - C2 COMBUSTIBLE-GAS DETECTOR
49 - C3 TRACE-GAS DETECTORS
49 - C4 FOAMING AGENTS
49 - C5 TOTAL IMMERSION
49 - C6 VISUAL INSPECTION

Sets out the specific requirements for LP Gas fuel systems for engines mounted on vehicles, either for the propulsion of the vehicle or for driving some auxiliary function. It also provides requirements for the design and construction of component parts, as well as their installation, testing, commissioning and periodic inspection.

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.The Standard may be applied to stationary engines and small engine-powered appliances such as floor sweepers, polishers, trolleys, etc, where it is relevant.This Standard does not apply 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.ApplicationThis Standard shall be read as defining the minimum requirement of acceptability.This Standard applies to installations commenced 6 months after its publication date. Unless otherwise specifically indicated in this Standard it does not apply to existing installations.The relevant authority having jurisdiction may determine the extent of application of this Standard.

First published in Australia 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.