AS 2746-1999

1 - AS 2746-1999 WORKING AREAS FOR GAS-FUELLED VEHICLES
4 - PREFACE
5 - CONTENTS
7 - FOREWORD
8 - SECTION 1 SCOPE AND GENERAL
8 - 1.1 SCOPE
8 - 1.2 OBJECTIVE
8 - 1.3 NEW DESIGNS AND INNOVATIONS
8 - 1.4 REFERENCED DOCUMENTS
9 - 1.5 DEFINITIONS
9 - 1.5.1 CNG
9 - 1.5.2 Gas fuel system
9 - 1.5.3 Hazardous area
9 - 1.5.4 Ignition source
9 - 1.5.5 NGV
9 - 1.5.6 Service pit
9 - 1.5.7 Working area
10 - SECTION 2 GENERAL SERVICE WORKING AREAS
10 - 2.1 APPLICATION
10 - 2.2 PREMISES
10 - 2.3 PREVENTION OF OVERHEATING
11 - SECTION 3 GAS LEAKAGE PROCEDURES
11 - 3.1 APPLICATION
11 - 3.2 PROCEDURES
11 - 3.2.1 Known or suspected gas escape
11 - 3.2.2 Damaged vehicles
12 - SECTION 4 SPECIALIST GAS WORKING AREAS - LP GAS
12 - 4.1 APPLICATION
12 - 4.2 PERSONNEL
12 - 4.3 EQUIPMENT
12 - 4.4 PREMISES
12 - 4.5 VENTILATION
13 - 4.6 INCREASED HAZARD
13 - 4.7 WORK ON THE CONTAINER AND FITTINGS
13 - 4.8 WORK ON THE GAS FUEL SYSTEM
13 - 4.9 FUEL UNLOADING
14 - 4.10 CONTAINER PURGING
14 - 4.11 PURGING INTO SERVICE
14 - 4.12 STORAGE OF UNPURGED CONTAINERS
14 - 4.13 SCRAPPING
14 - 4.13.1 Vehicles
14 - 4.13.2 Containers
15 - SECTION 5 SPECIALIST GAS WORKING AREAS - CNG
15 - 5.1 APPLICATION
15 - 5.2 PERSONNEL
15 - 5.3 EQUIPMENT
15 - 5.4 PREMISES
15 - 5.5 VENTILATION
15 - 5.6 INCREASED HAZARD
16 - 5.7 WORK ON THE CYLINDER AND FITTINGS
16 - 5.8 WORK ON THE GAS FUEL SYSTEM
16 - 5.9 FUEL UNLOADING
16 - 5.10 STORAGE OF UNPURGED CYLINDERS
16 - 5.11 SCRAPPING
16 - 5.11.1 Vehicles
16 - 5.11.2 Cylinders
17 - APPENDIX A - REGULATING AGENCY INFORMATION
19 - APPENDIX B - SPECIALIST WORKING AREA EQUIPMENT
20 - APPENDIX C - LP GAS FUEL UNLOADING METHODS
20 - C1 INTRODUCTION
20 - C2 DECANTING
20 - C2.1 Description
20 - C2.2 Precautions
21 - C2.3 Equipment
21 - C2.4 Procedure
21 - C3 FLARING
21 - C3.1 Description
21 - C3.2 Precautions
21 - C3.3 Equipment
21 - C3.4 Procedure
22 - C4 PUMPING OUT
22 - C4.1 Description
22 - C4.2 Compression method
22 - C4.3 Applied pressure method
22 - C5 VENTING
22 - C5.1 General
23 - C5.2 Description
23 - C5.3 Precautions
24 - APPENDIX D - CNG FUEL UNLOADING METHODS
24 - D1 INTRODUCTION
24 - D2 FLARING
24 - D2.1 Description
24 - D2.2 Precautions
24 - D2.3 Equipment
24 - D2.4 Procedure
25 - D3 VENTING TO ATMOSPHERE
25 - D3.1 General
25 - D3.2 Precautions
25 - D3.3 Equipment
25 - D3.4 Procedure

Sets out requirements for the premises and the procedures for converting and equipping vehicles to use LP Gas or CNG as an engine fuel. Procedures for the maintenance, servicing and repairs to the gas fuel system are also included.

This Standard sets out requirements for the premises, and procedures for the following types of work or activity associated with gas-fuelled vehicles: (a) Converting and equipping vehicles to use gas such as liquefied petroleum gas (LP Gas) or compressed natural gas (CNG) as an engine fuel.(b) Maintenance, servicing and repairs to the gas fuel system, e.g. adjustment, maintenance and replacement of gas system componentry.(c) Routine motor vehicle maintenance not involving the gas fuel system, e.g. lubrication, brake repair or wheel alignment, body or windscreen repairs, engine tuning.NOTE: The operations described in Items (a) or (b) above are undertaken in a specialist gas working area, whereas Item (c) would apply to general service workshops not having any specific requirements for working with gaseous engine fuels.

First published as AS 2746-1985.
Second edition 1999.