We noticed you’re not on the correct regional site. Switch to our AMERICAS site for the best experience.
  • AS/NZS 2739:1999

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
    Add to Watchlist
    This Standard has been added successfully to your Watchlist
    Please visit My Watchlist to see all standards that you are watching.
    Please log in or to add this standard to your Watchlist.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    We could not add this standard to your Watchlist.
    Please retry or contact support for assistance.
    You have already added this standard to your Watchlist.
    Visit My Watchlist to view the full list.

    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    Superseded date:  30-06-2017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): 

    Published date:  01-01-1999

    Publisher:  Standards Australia

    Add to Watchlist

    Add To Cart

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

    1 - AS/NZS 2739:1999 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 NEW DESIGNS AND INNOVATIONS
    7 - 1.5 DEFINITIONS
    7 - 1.5.1 Approved, approval
    8 - 1.5.2 Authorized person
    8 - 1.5.3 Authority
    8 - 1.5.4 Capacity (of a cylinder)
    8 - 1.5.5 CNG (Compressed natural gas)
    8 - 1.5.6 Cylinder
    8 - 1.5.7 Cylinder compartment
    8 - 1.5.8 Cylinder sub-compartment
    8 - 1.5.9 Design pressure
    8 - 1.5.10 Fuel shut-off device
    8 - 1.5.11 Fuel metering system
    8 - 1.5.12 Fuel service line
    9 - 1.5.13 Gas air mixer
    9 - 1.5.14 Ignition source
    9 - 1.5.15 Licensed installer
    9 - 1.5.16 May
    9 - 1.5.17 NGV
    9 - 1.5.18 Non-return valve
    9 - 1.5.19 Pressure
    9 - 1.5.20 Pressure relief device
    9 - 1.5.21 Professional engineer
    9 - 1.5.22 Rated working pressure
    9 - 1.5.23 Refuelling interlock device
    10 - 1.5.24 Regulator
    10 - 1.5.25 Removable cylinder
    10 - 1.5.26 Shall
    10 - 1.5.27 Should
    10 - 1.6 VEHICLE MODIFICATIONS
    11 - 1.7 MINOR ALTERATIONS
    11 - 1.8 ENGINE MANAGEMENT SYSTEM
    11 - 1.8.1 Alterations
    11 - 1.8.2 Closed loop systems
    11 - 1.9 APPROVED EQUIPMENT
    11 - 1.10 PREVIOUSLY USED EQUIPMENT
    11 - 1.10.1 Provisions
    11 - 1.10.2 Prohibitions
    11 - 1.11 WORKING AREA AND SAFE PRACTICES
    12 - SECTION 2 COMPONENTS
    12 - 2.1 GENERAL SUITABILITY
    12 - 2.1.1 General
    12 - 2.1.2 Suitability for pressure
    12 - 2.1.3 Suitability for installation
    12 - 2.2 MOVING PARTS
    12 - 2.3 MODIFICATION
    13 - SECTION 3 FUEL SYSTEM COMPONENTS
    13 - 3.1 APPLICATION
    13 - 3.1.1 General
    13 - 3.1.2 Fuel supply system components
    13 - 3.1.3 Use of multiple components
    13 - 3.2 CYLINDER
    13 - 3.2.1 General
    13 - 3.2.2 Use of removable cylinders
    13 - 3.2.3 Cylinder painting
    14 - 3.3 COMPONENTS FOR REMOVABLE CYLINDERS
    14 - 3.4 CYLINDER VALVE
    14 - 3.5 REFUELLING CONNECTION
    14 - 3.5.1 Design of connection
    14 - 3.5.2 Dust cap
    14 - 3.5.3 Refuelling interlock device
    14 - 3.6 REFUELLING NON-RETURN VALVE
    14 - 3.7 LOCATION OF REFUELLING CONNECTION
    15 - 3.8 REFUELLING INFORMATION PLATE
    16 - 3.9 SERVICE ISOLATION VALVE
    16 - 3.10 FUEL FILTER
    16 - 3.11 FUEL SHUT-OFF DEVICE
    16 - 3.12 FUEL FLOW REGULATION DEVICE
    16 - 3.13 CONTENTS INDICATOR
    16 - 3.14 CYLINDER COMPARTMENTS AND SUB-COMPARTMENTS
    16 - 3.14.1 Internal cylinders
    17 - 3.14.2 Safety device discharge
    17 - 3.14.3 Construction
    17 - 3.14.4 Ventilation
    18 - 3.14.5 Conduits
    19 - 3.15 MOUNTING OF FUEL CYLINDER
    19 - 3.15.1 Access to valves
    19 - 3.15.2 Attachment to vehicle
    20 - 3.15.3 Alternate anchoring
    21 - 3.15.4 Multiple cylinders
    21 - 3.16 CYLINDER LOCATION AND GROUND CLEARANCES
    22 - 3.17 PROTECTION
    23 - 3.18 HEAT SHIELDING
    25 - SECTION 4 FUEL SERVICE LINE
    25 - 4.1 APPLICATION
    25 - 4.2 RIGID PIPING
    25 - 4.3 FLEXIBLE PIPING
    25 - 4.4 JOINTS AND CONNECTIONS
    25 - 4.5 PIPING INSTALLATION AND PROTECTION
    26 - 4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
    26 - 4.7 TRAILERS AND SEMITRAILERS
    27 - 4.8 PREVIOUSLY USED EQUIPMENT
    27 - 4.8.1 Provisions
    27 - 4.8.2 Prohibitions
    27 - 4.9 FUEL HOSE FOR PRESSURE NOT EXCEEDING 100 KPA
    27 - 4.10 BREAKAWAY COUPLING
    28 - SECTION 5 FUEL CONTROL EQUIPMENT
    28 - 5.1 APPLICATION
    28 - 5.2 FUEL METERING SYSTEM
    28 - 5.3 FUEL SELECTOR
    28 - 5.3.1 General
    28 - 5.3.2 Fuel change over system
    29 - 5.3.3 Bi-fuel type
    29 - 5.4 PETROL SYSTEM MODIFICATIONS
    29 - 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 Water system tests
    33 - 6.8.6 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
    39 - APPENDIX B - REGULATING AGENCY INFORMATION
    41 - APPENDIX C - NEW ZEALAND REFUELLING CONNECTION AND DUST PLUG
    42 - APPENDIX D - LEAK DETECTION METHODS
    42 - D1 SCOPE
    42 - D2 COMBUSTIBLE GAS DETECTORS
    42 - D3 TRACE GAS DETECTORS
    42 - D4 FOAMING AGENTS
    43 - D5 TOTAL IMMERSION

    Abstract - (Show below) - (Hide below)

    Sets out the specific 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. It also provides 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.The Standard may be applied to stationary engines and small engine-powered appliances such as floor sweepers, polishers and trolleys, where it is relevant.This Standard does not apply to other natural 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 1.7). 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)

    Amendment 1 see DR 00367 CP. Amendment 2 see DR 01046 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 designated AS/NZS 2739:1999. 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 designated AS/NZS 2739:1999.

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

    AS 1743-1992 Road signs - Specifications
    AS 2465-1981 Unified hexagon bolts, screws and nuts (UNC and UNF threads)
    AS 2337.1-1999 Gas cylinder test stations - General requirements, inspections and tests - Gas cylinders
    AS 2337.3-1998 Gas cylinder test stations - Inspection and testing of fibre reinforced plastics (FRP) gas cylinders
    AS/NZS 1110:1995 ISO metric precision hexagon bolts and screws
    AS 2613-1989 Safety devices for gas cylinders
    AS 1751-1999 Copper brazed steel tubes
    AS 2746-1999 Working areas for gas-fuelled vehicles
    AS 2473-1990 Valves for compressed gas cylinders (threaded outlet)
    AS D26-1972 Tube fittings with dryseal American standard taper pipe and unified threads for automotive and industrial use (imperial units) (Reconfirmed 2018)
    AS/NZS 1869:1996 Hose and hose assemblies for liquefied petroleum gases (LP Gas), natural gas and town gas
    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective