AS/NZS 2739:1999
Natural gas (CNG) fuel systems for vehicle engines
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.
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AS/NZS 2739:1999 NATURAL GAS (CNG) FUEL SYSTEMS FOR VEHICLE ENGINES
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 OBJECTIVE
1.3 REFERENCED DOCUMENTS
1.4 NEW DESIGNS AND INNOVATIONS
1.5 DEFINITIONS
1.5.1 Approved, approval
1.5.2 Authorized person
1.5.3 Authority
1.5.4 Capacity (of a cylinder)
1.5.5 CNG (Compressed natural gas)
1.5.6 Cylinder
1.5.7 Cylinder compartment
1.5.8 Cylinder sub-compartment
1.5.9 Design pressure
1.5.10 Fuel shut-off device
1.5.11 Fuel metering system
1.5.12 Fuel service line
1.5.13 Gas air mixer
1.5.14 Ignition source
1.5.15 Licensed installer
1.5.16 May
1.5.17 NGV
1.5.18 Non-return valve
1.5.19 Pressure
1.5.20 Pressure relief device
1.5.21 Professional engineer
1.5.22 Rated working pressure
1.5.23 Refuelling interlock device
1.5.24 Regulator
1.5.25 Removable cylinder
1.5.26 Shall
1.5.27 Should
1.6 VEHICLE MODIFICATIONS
1.7 MINOR ALTERATIONS
1.8 ENGINE MANAGEMENT SYSTEM
1.8.1 Alterations
1.8.2 Closed loop systems
1.9 APPROVED EQUIPMENT
1.10 PREVIOUSLY USED EQUIPMENT
1.10.1 Provisions
1.10.2 Prohibitions
1.11 WORKING AREA AND SAFE PRACTICES
SECTION 2 COMPONENTS
2.1 GENERAL SUITABILITY
2.1.1 General
2.1.2 Suitability for pressure
2.1.3 Suitability for installation
2.2 MOVING PARTS
2.3 MODIFICATION
SECTION 3 FUEL SYSTEM COMPONENTS
3.1 APPLICATION
3.1.1 General
3.1.2 Fuel supply system components
3.1.3 Use of multiple components
3.2 CYLINDER
3.2.1 General
3.2.2 Use of removable cylinders
3.2.3 Cylinder painting
3.3 COMPONENTS FOR REMOVABLE CYLINDERS
3.4 CYLINDER VALVE
3.5 REFUELLING CONNECTION
3.5.1 Design of connection
3.5.2 Dust cap
3.5.3 Refuelling interlock device
3.6 REFUELLING NON-RETURN VALVE
3.7 LOCATION OF REFUELLING CONNECTION
3.8 REFUELLING INFORMATION PLATE
3.9 SERVICE ISOLATION VALVE
3.10 FUEL FILTER
3.11 FUEL SHUT-OFF DEVICE
3.12 FUEL FLOW REGULATION DEVICE
3.13 CONTENTS INDICATOR
3.14 CYLINDER COMPARTMENTS AND SUB-COMPARTMENTS
3.14.1 Internal cylinders
3.14.2 Safety device discharge
3.14.3 Construction
3.14.4 Ventilation
3.14.5 Conduits
3.15 MOUNTING OF FUEL CYLINDER
3.15.1 Access to valves
3.15.2 Attachment to vehicle
3.15.3 Alternate anchoring
3.15.4 Multiple cylinders
3.16 CYLINDER LOCATION AND GROUND CLEARANCES
3.17 PROTECTION
3.18 HEAT SHIELDING
SECTION 4 FUEL SERVICE LINE
4.1 APPLICATION
4.2 RIGID PIPING
4.3 FLEXIBLE PIPING
4.4 JOINTS AND CONNECTIONS
4.5 PIPING INSTALLATION AND PROTECTION
4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
4.7 TRAILERS AND SEMITRAILERS
4.8 PREVIOUSLY USED EQUIPMENT
4.8.1 Provisions
4.8.2 Prohibitions
4.9 FUEL HOSE FOR PRESSURE NOT EXCEEDING 100 KPA
4.10 BREAKAWAY COUPLING
SECTION 5 FUEL CONTROL EQUIPMENT
5.1 APPLICATION
5.2 FUEL METERING SYSTEM
5.3 FUEL SELECTOR
5.3.1 General
5.3.2 Fuel change over system
5.3.3 Bi-fuel type
5.4 PETROL SYSTEM MODIFICATIONS
5.5 ELECTRICAL WIRING
5.6 ENGINE MANAGEMENT SYSTEM
SECTION 6 INSPECTION TESTING AND COMMISSIONING
6.1 APPLICATION
6.2 USED EQUIPMENT
6.3 MODIFICATIONS AND REPAIRS
6.4 PRECAUTIONS
6.5 INSPECTION
6.6 LEAK DETECTION
6.7 CYLINDER
6.8 INSTALLATION TEST
6.8.1 General
6.8.2 Gastightness of compartment and sub-compartment
6.8.3 Leak testing of gas system
6.8.4 Test of fuel changeover system
6.8.5 Water system tests
6.8.6 Visual inspection
6.9 PERIODIC INSPECTION
6.9.1 General
6.9.2 System check
6.10 NON-RETURN VALVE TEST
SECTION 7 CERTIFICATION, COMPLIANCE PLATE, MARKINGS AND LABELS
7.1 APPLICATION
7.2 CERTIFICATION
7.3 COMPLIANCE PLATE
7.4 LABELS AND MARKINGS
7.4.1 Vehicle identification
7.4.2 Refuelling information plate
7.4.3 Selector
7.5 OPERATING INSTRUCTIONS
APPENDIX A - LIST OF REFERENCED DOCUMENTS
APPENDIX B - REGULATING AGENCY INFORMATION
APPENDIX C - NEW ZEALAND REFUELLING CONNECTION AND DUST PLUG
APPENDIX D - LEAK DETECTION METHODS
D1 SCOPE
D2 COMBUSTIBLE GAS DETECTORS
D3 TRACE GAS DETECTORS
D4 FOAMING AGENTS
D5 TOTAL IMMERSION
Amendments
Previous versions
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AS/NZS 2739:1999 NATURAL GAS (CNG) FUEL SYSTEMS FOR VEHICLE ENGINES
PREFACE
CONTENTS
SECTION 1 SCOPE AND GENERAL
1.1 SCOPE
1.2 OBJECTIVE
1.3 REFERENCED DOCUMENTS
1.4 NEW DESIGNS AND INNOVATIONS
1.5 DEFINITIONS
1.5.1 Approved, approval
1.5.2 Authorized person
1.5.3 Authority
1.5.4 Capacity (of a cylinder)
1.5.5 CNG (Compressed natural gas)
1.5.6 Cylinder
1.5.7 Cylinder compartment
1.5.8 Cylinder sub-compartment
1.5.9 Design pressure
1.5.10 Fuel shut-off device
1.5.11 Fuel metering system
1.5.12 Fuel service line
1.5.13 Gas air mixer
1.5.14 Ignition source
1.5.15 Licensed installer
1.5.16 May
1.5.17 NGV
1.5.18 Non-return valve
1.5.19 Pressure
1.5.20 Pressure relief device
1.5.21 Professional engineer
1.5.22 Rated working pressure
1.5.23 Refuelling interlock device
1.5.24 Regulator
1.5.25 Removable cylinder
1.5.26 Shall
1.5.27 Should
1.6 VEHICLE MODIFICATIONS
1.7 MINOR ALTERATIONS
1.8 ENGINE MANAGEMENT SYSTEM
1.8.1 Alterations
1.8.2 Closed loop systems
1.9 APPROVED EQUIPMENT
1.10 PREVIOUSLY USED EQUIPMENT
1.10.1 Provisions
1.10.2 Prohibitions
1.11 WORKING AREA AND SAFE PRACTICES
SECTION 2 COMPONENTS
2.1 GENERAL SUITABILITY
2.1.1 General
2.1.2 Suitability for pressure
2.1.3 Suitability for installation
2.2 MOVING PARTS
2.3 MODIFICATION
SECTION 3 FUEL SYSTEM COMPONENTS
3.1 APPLICATION
3.1.1 General
3.1.2 Fuel supply system components
3.1.3 Use of multiple components
3.2 CYLINDER
3.2.1 General
3.2.2 Use of removable cylinders
3.2.3 Cylinder painting
3.3 COMPONENTS FOR REMOVABLE CYLINDERS
3.4 CYLINDER VALVE
3.5 REFUELLING CONNECTION
3.5.1 Design of connection
3.5.2 Dust cap
3.5.3 Refuelling interlock device
3.6 REFUELLING NON-RETURN VALVE
3.7 LOCATION OF REFUELLING CONNECTION
3.8 REFUELLING INFORMATION PLATE
3.9 SERVICE ISOLATION VALVE
3.10 FUEL FILTER
3.11 FUEL SHUT-OFF DEVICE
3.12 FUEL FLOW REGULATION DEVICE
3.13 CONTENTS INDICATOR
3.14 CYLINDER COMPARTMENTS AND SUB-COMPARTMENTS
3.14.1 Internal cylinders
3.14.2 Safety device discharge
3.14.3 Construction
3.14.4 Ventilation
3.14.5 Conduits
3.15 MOUNTING OF FUEL CYLINDER
3.15.1 Access to valves
3.15.2 Attachment to vehicle
3.15.3 Alternate anchoring
3.15.4 Multiple cylinders
3.16 CYLINDER LOCATION AND GROUND CLEARANCES
3.17 PROTECTION
3.18 HEAT SHIELDING
SECTION 4 FUEL SERVICE LINE
4.1 APPLICATION
4.2 RIGID PIPING
4.3 FLEXIBLE PIPING
4.4 JOINTS AND CONNECTIONS
4.5 PIPING INSTALLATION AND PROTECTION
4.6 PIPING OR FITTINGS IN ENCLOSED SPACES
4.7 TRAILERS AND SEMITRAILERS
4.8 PREVIOUSLY USED EQUIPMENT
4.8.1 Provisions
4.8.2 Prohibitions
4.9 FUEL HOSE FOR PRESSURE NOT EXCEEDING 100 KPA
4.10 BREAKAWAY COUPLING
SECTION 5 FUEL CONTROL EQUIPMENT
5.1 APPLICATION
5.2 FUEL METERING SYSTEM
5.3 FUEL SELECTOR
5.3.1 General
5.3.2 Fuel change over system
5.3.3 Bi-fuel type
5.4 PETROL SYSTEM MODIFICATIONS
5.5 ELECTRICAL WIRING
5.6 ENGINE MANAGEMENT SYSTEM
SECTION 6 INSPECTION TESTING AND COMMISSIONING
6.1 APPLICATION
6.2 USED EQUIPMENT
6.3 MODIFICATIONS AND REPAIRS
6.4 PRECAUTIONS
6.5 INSPECTION
6.6 LEAK DETECTION
6.7 CYLINDER
6.8 INSTALLATION TEST
6.8.1 General
6.8.2 Gastightness of compartment and sub-compartment
6.8.3 Leak testing of gas system
6.8.4 Test of fuel changeover system
6.8.5 Water system tests
6.8.6 Visual inspection
6.9 PERIODIC INSPECTION
6.9.1 General
6.9.2 System check
6.10 NON-RETURN VALVE TEST
SECTION 7 CERTIFICATION, COMPLIANCE PLATE, MARKINGS AND LABELS
7.1 APPLICATION
7.2 CERTIFICATION
7.3 COMPLIANCE PLATE
7.4 LABELS AND MARKINGS
7.4.1 Vehicle identification
7.4.2 Refuelling information plate
7.4.3 Selector
7.5 OPERATING INSTRUCTIONS
APPENDIX A - LIST OF REFERENCED DOCUMENTS
APPENDIX B - REGULATING AGENCY INFORMATION
APPENDIX C - NEW ZEALAND REFUELLING CONNECTION AND DUST PLUG
APPENDIX D - LEAK DETECTION METHODS
D1 SCOPE
D2 COMBUSTIBLE GAS DETECTORS
D3 TRACE GAS DETECTORS
D4 FOAMING AGENTS
D5 TOTAL IMMERSION
Amendments
Previous versions
AS/NZS 2739:1999
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.