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  • AS/NZS 2739:2003

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Natural gas (CNG) fuel systems for vehicle engines

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  30-06-2017

    Language(s):  English

    Published date:  01-01-2003

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS/NZS 2739:2003 NATURAL GAS (CNG) FUEL SYSTEMS FOR VEHICLE ENGINES
    4 - PREFACE
    5 - CONTENTS
    7 - SECTION 1 SCOPE AND GENERAL
    7 - 1.1 SCOPE
    7 - 1.2 OBJECTIVE
    7 - 1.3 REFERENCED DOCUMENTS
    7 - 1.4 DEFINITIONS
    7 - 1.4.1 Approved, approval
    7 - 1.4.2 Authority
    7 - 1.4.3 Authorized person
    8 - 1.4.4 Automatic fuel shut-off device
    8 - 1.4.5 Capacity (of a cylinder)
    8 - 1.4.6 Certified kit
    8 - 1.4.7 CNG (Compressed natural gas)
    8 - 1.4.8 Cylinder
    8 - 1.4.9 Cylinder compartment
    8 - 1.4.10 Cylinder sub-compartment
    8 - 1.4.11 Design pressure
    8 - 1.4.12 Fuel
    8 - 1.4.13 Fuel metering system
    8 - 1.4.14 Fuel service line
    8 - 1.4.15 Gas air mixer
    9 - 1.4.16 Ignition source
    9 - 1.4.17 Licensed installer
    9 - 1.4.18 May
    9 - 1.4.19 NGV
    9 - 1.4.20 Non-return valve
    9 - 1.4.21 Pressure
    9 - 1.4.22 Pressure relief device
    9 - 1.4.23 Professional engineer
    9 - 1.4.24 Rated working pressure
    9 - 1.4.25 Refuelling interlock device
    9 - 1.4.26 Regulator
    9 - 1.4.27 Removable cylinder
    10 - 1.4.28 Shall
    10 - 1.4.29 Should
    10 - 1.5 NEW DESIGNS AND INNOVATIONS
    10 - 1.6 VEHICLE MODIFICATIONS
    11 - 1.7 MINOR ALTERATIONS
    11 - 1.8 ENGINE MANAGEMENT SYSTEM ALTERATIONS
    11 - 1.9 EXHAUST EMISSION REQUIREMENT (Australia only)
    11 - 1.9.1 Original equipment manufacture (OEM) CNG vehicles
    11 - 1.9.2 Vehicles retrofitted to CNG
    11 - 1.10 APPROVED EQUIPMENT
    11 - 1.11 PREVIOUSLY USED EQUIPMENT
    11 - 1.11.1 Provisions
    12 - 1.11.2 Prohibitions
    12 - 1.12 WORKING AREA AND SAFE PRACTICES
    13 - SECTION 2 COMPONENTS
    13 - 2.1 GENERAL SUITABILITY
    13 - 2.1.1 General
    13 - 2.1.2 Suitability for pressure
    13 - 2.1.3 Suitability for installation
    13 - 2.2 COMPONENT PARTS
    13 - 2.3 MODIFICATION
    14 - SECTION 3 FUEL SYSTEM COMPONENTS
    14 - 3.1 APPLICATION
    14 - 3.1.1 General
    14 - 3.1.2 Fuel supply system components
    14 - 3.1.3 Use of multiple components
    14 - 3.2 CYLINDER
    14 - 3.2.1 General
    14 - 3.2.2 Use of removable cylinders
    14 - 3.2.3 Cylinder painting
    14 - 3.3 COMPONENTS FOR REMOVABLE CYLINDERS
    15 - 3.4 CYLINDER VALVE
    15 - 3.5 REFUELLING CONNECTION
    15 - 3.5.1 Design of connection
    15 - 3.5.2 Dust cap
    15 - 3.5.3 Refuelling interlock device (New Zealand only)
    15 - 3.6 REFUELLING NON-RETURN VALVE
    15 - 3.7 LOCATION OF REFUELLING CONNECTION
    16 - 3.8 REFUELLING INFORMATION PLATE
    16 - 3.9 SERVICE ISOLATION VALVE
    17 - 3.10 FUEL FILTER
    17 - 3.11 AUTOMATIC FUEL SHUT-OFF DEVICE
    17 - 3.12 FUEL FLOW REGULATION DEVICE
    17 - 3.13 CONTENTS INDICATOR
    17 - 3.14 CYLINDER COMPARTMENTS AND SUB-COMPARTMENTS
    17 - 3.14.1 Internal cylinders
    18 - 3.14.2 Safety device discharge
    18 - 3.14.3 Construction
    18 - 3.14.4 Ventilation
    19 - 3.14.5 Conduits
    20 - 3.15 MOUNTING OF FUEL CYLINDER
    20 - 3.15.1 Access to valves
    20 - 3.15.2 Attachment to vehicle
    21 - 3.15.3 Alternate anchoring
    22 - 3.15.4 Multiple cylinders
    22 - 3.16 CYLINDER LOCATION AND GROUND CLEARANCES
    23 - 3.17 PROTECTION
    24 - 3.18 HEAT SHIELDING
    26 - SECTION 4 FUEL SERVICE LINE
    26 - 4.1 APPLICATION
    26 - 4.2 RIGID PIPING
    26 - 4.3 FLEXIBLE PIPING
    26 - 4.4 JOINTS AND CONNECTIONS
    26 - 4.5 PIPING INSTALLATION AND PROTECTION
    27 - 4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
    27 - 4.7 TRAILERS AND SEMITRAILERS
    28 - 4.8 FUEL HOSE FOR PRESSURE NOT EXCEEDING 100 kPa
    28 - 4.9 BREAKAWAY COUPLING
    29 - SECTION 5 FUEL CONTROL EQUIPMENT
    29 - 5.1 APPLICATION
    29 - 5.2 FUEL METERING SYSTEM
    29 - 5.3 FUEL SELECTOR
    29 - 5.3.1 General
    29 - 5.3.2 Optional fuel type
    30 - 5.4 PETROL OR DIESEL SYSTEM MODIFICATIONS
    30 - 5.5 ELECTRICAL WIRING
    30 - 5.6 ENGINE MANAGEMENT SYSTEM
    31 - SECTION 6 INSPECTION, TESTING AND COMMISSIONING
    31 - 6.1 APPLICATION
    31 - 6.2 USED EQUIPMENT
    31 - 6.3 MODIFICATIONS AND REPAIRS
    31 - 6.4 PRECAUTIONS
    32 - 6.5 INSPECTION
    32 - 6.6 LEAK DETECTION
    32 - 6.7 CYLINDER
    32 - 6.8 INSTALLATION TEST
    32 - 6.8.1 General
    32 - 6.8.2 Gastightness of compartment and sub-compartment
    32 - 6.8.3 Leak testing of gas system
    32 - 6.8.4 Test of fuel changeover system
    32 - 6.8.5 Test of automatic full shut-off device (AFSOD) operation
    32 - 6.8.6 Water system tests
    33 - 6.8.7 Visual inspection
    33 - 6.9 PERIODIC INSPECTION
    33 - 6.9.1 General
    33 - 6.9.2 System check
    34 - 6.10 NON-RETURN VALVE TEST
    35 - SECTION 7 CERTIFICATION, COMPLIANCE PLATE, MARKINGS AND LABELS
    35 - 7.1 APPLICATION
    35 - 7.2 CERTIFICATION
    35 - 7.3 COMPLIANCE PLATE
    35 - 7.4 LABELS AND MARKINGS
    35 - 7.4.1 Vehicle identification
    36 - 7.4.2 Refuelling information plate
    36 - 7.4.3 Selector
    36 - 7.5 OPERATING INSTRUCTIONS
    37 - APPENDIX A - LIST OF REFERENCED DOCUMENTS
    40 - APPENDIX B - REGULATING AGENCY INFORMATION
    43 - APPENDIX C - NEW ZEALAND REFUELLING CONNECTION AND DUST PLUG
    44 - APPENDIX D - LEAK DETECTION METHODS
    44 - D1 SCOPE
    44 - D2 COMBUSTIBLE GAS DETECTORS
    44 - D3 TRACE GAS DETECTORS
    44 - D4 FOAMING AGENTS
    45 - D5 TOTAL IMMERSION
    46 - APPENDIX E - PROCEDURES FOR DEMONSTRATING COMPLIANCE WITH EXHAUST EMISSION STANDARDS
    46 - E1 SCOPE AND VEHICLE SELECTION
    46 - E1.1 Scope
    46 - E1.2 Test fuel composition
    46 - E1.3 Use of certified kits on engine/vehicle variants
    48 - E2 ADR79/00 VEHICLES
    48 - E2.1 General requirements
    48 - E2.2 Testing requirements
    49 - E2.3 Documentation and installation requirements
    49 - E3 ADR79/01 VEHICLES
    49 - E3.1 General requirements
    49 - E3.2 Testing requirements
    50 - E3.3 Documentation and installation requirements
    50 - E4 ADR70/00 VEHICLES
    50 - E4.1 General requirements
    51 - E4.2 Testing requirements
    52 - E4.3 Documentation and installation requirements
    53 - E5 ADR80/00 AND ADR80/01 VEHICLES
    53 - E5.1 General requirements
    53 - E5.2 Testing requirements
    53 - E5.3 Documentation and installation requirements

    Abstract - (Show below) - (Hide below)

    Sets out requirements for natural gas (CNG) fuel systems for motor vehicle engines used for propulsion or auxiliary functions. It also specifies requirements for the design and construction of component parts as well as their installation, testing, commissioning and periodic inspection.

    Scope - (Show below) - (Hide below)

    This Standard specifies requirements for natural gas (CNG) 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. It applies to all vehicle types, e.g. rigid chassis, articulated chassis and semitrailers. This Standard does not apply to forklifts, floor sweepers, polishers, tow tractors, elevating work platforms and industrial stationary engines and to other CNG 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 1.7). 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.

    General Product Information - (Show below) - (Hide below)

    Committee ME-046
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes
    Under Revision

    History - (Show below) - (Hide below)

    First published in Australia as AS 2739-1984.
    Second edition 1992.
    First published in New Zealand in part as NZS 5422.2-1980.
    Second edition 1987.
    NZS 5422.3 first published 1991.
    AS 2739-1992, NZS 5422.2:1987 and part of NZS 5422.3:1994 jointly revised, amalgamated and redesignated as AS/NZS 2739:1999.
    Fourth edition 2003. First published in Australia as AS 2739-1984. Second edition 1992. First published in New Zealand in part as NZS 5422.2-1980. Second edition 1987. NZS 5422.3 first published 1991. AS 2739-1992, NZS 5422.2:1987 and part of NZS 5422.3:1994 jointly revised, amalgamated and redesignated as AS/NZS 2739:1999. Fourth edition 2003.

    Standards Referenced By This Book - (Show below) - (Hide below)

    AS/NZS 1869:1996 Hose and hose assemblies for liquefied petroleum gases (LP Gas), natural gas and town gas
    AS/NZS 1906.1:2007 Retroreflective materials and devices for road traffic control purposes Retroreflective sheeting
    AS 4838-2002 Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles
    AS 2337.1-1999 Gas cylinder test stations - General requirements, inspections and tests - Gas cylinders
    AS 4291.1-2000 Mechanical properties of fasteners made of carbon steel and alloy steel - Bolts, screws and studs
    AS 2746-1999 Working areas for gas-fuelled vehicles
    AS D26-1972 Tube fittings with dryseal American standard taper pipe and unified threads for automotive and industrial use (imperial units) (Reconfirmed 2018)
    AS 2337.1-2004 Gas cylinder test stations General requirements, inspection and tests - Gas cylinders
    MP 48-2007 Certificated gas cylinder test stations
    MP 48-2001 Certificated gas cylinder test stations
    AS 2337.3-2006 Gas cylinder test stations Transportable gas cylinders - Periodic inspection and testing of composite gas cylinders (ISO 11623:2002, MOD)
    AS 2337.3-1998 Gas cylinder test stations - Inspection and testing of fibre reinforced plastics (FRP) gas cylinders
    AS 2473-1996 Valves for compressed gas cylinders (threaded outlet)
    AS 2613-1989 Safety devices for gas cylinders
    AS 2613-2005 Safety devices for gas cylinders
    AS/NZS 1906.1:1993 Retroreflective materials and devices for road traffic control purposes - Retroreflective materials

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 4564-2005 Specification for general purpose natural gas
    AS 2337.1-2004 Gas cylinder test stations General requirements, inspection and tests - Gas cylinders
    AS/NZS 1869:1996 Hose and hose assemblies for liquefied petroleum gases (LP Gas), natural gas and town gas
    AS 2746-2008 Working areas for gas-fuelled vehicles
    AS 2746-1999 Working areas for gas-fuelled vehicles
    AS/NZS 2229:2004 Fuel dispensing equipment for explosive atmospheres
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