I.S. 808:2002

Declaration
Foreword
1 Scope
2 References
3 Terms and definitions
4 Specific requirements
   4.1 General
   4.2 CNG system
   4.3 Design
        4.3.1 General
        4.3.2 Vehicle modifications
   4.4 Filling stations
   4.5 Heat shielding
   4.6 Gas quality
   4.7 Vehicle hand-over and documentation
5 Cylinders
   5.1 Design and specification of cylinder and cylinder
        valve assembly
        5.1.1 Cylinder valve
        5.1.2 Pressure relief device
        5.1.3 Excess flow valve
        5.1.4 Cylinder markings
        5.1.5 Surface treatment
   5.2 Cylinder installation
        5.2.1 Cylinder weight
        5.2.2 Attachment to vehicle
        5.2.3 Location
        5.2.4 Shielding
        5.2.5 Enclosure and venting to atmosphere of
               internal cylinders
   5.3 Cylinder inspection and revalidation
        5.3.1 Cylinder inspection
6 CNG fuel line
   6.1 Fuel line subject to cylinder pressure
   6.2 Fuel line size
   6.3 Joints and connection
   6.4 Securing and location
   6.5 CNG fuel line subject to pressure not exceeding
        100 kPa
   6.6 Flexibility
   6.7 Hose renewal
7 Engine and fuel control systems
   7.1 General
   7.2 CNG control equipment
        7.2.1 CNG service shut-off valve
        7.2.2 Filter
        7.2.3 CNG automatic shut-off valve
        7.2.4 Regulator system
        7.2.5 Gas/air mixer
        7.2.6 Gas injector
   7.3 Fuel selector
   7.4 Interface with petrol system
        7.4.1 General
        7.4.2 Electronic ignition modifier
        7.4.3 Carburettor systems
   7.5 Installation
        7.5.1 General
        7.5.2 Electrical wiring
   7.6 Inertia switch
   7.7 CNG fuel contents indicator
8 Filling equipment
   8.1 Maximum filling pressure
   8.2 Filling connection
   8.3 Position of filling receptacle
   8.4 Filler non-return valve
9 Garaging and repair
   9.1 General
   9.2 Scrapping
10 Labels and identification plates
11 Inspection, testing and commissioning
   11.1 General
   11.2 Initial inspection and testing
        11.2.1 General
        11.2.2 Leak testing (see annex G)
        11.2.3 Installation certificate
   11.3 Periodic inspection and testing
        11.3.1 Inspection
        11.3.2 Periodic leak test
        11.3.3 CNG system component test
   11.4 Records
12 Components
   12.1 Application
   12.2 Strength and durability
         12.2.1 Design pressure
         12.2.2 Moving parts
         12.2.3 Suitability for installation
   12.3 Materials
         12.3.1 Metals
         12.3.2 Non-metals
   12.4 Filler non-return valve system (check valves)
   12.5 Filling interlock device
   12.6 Filling receptacle
   12.7 Regulator
   12.8 CNG automatic shut-off valve
   12.9 CNG service shut-off valve
   12.10 Fuel selector
   12.11 Pressure measurement device
   12.12 CNG fuel contents indicator
   12.13 Gas/air mixer
   12.14 Gas injector
   12.15 CNG fuel line
         12.15.1 High pressure tubing and fittings
         12.15.2 Low pressure tubing and connections
   12.16 Inertia switch
   12.17 Filter
   12.18 CNG system electrical equipment and associated
         wiring
   12.19 CNG cylinder
   12.20 Cylinder valve
   12.21 Pressure relief device
   12.22 Excess flow valve
   12.23 Cylinder compartments and sub-compartments
Annex A (informative) Definitions of vehicle categories
        and zones of clearance (extract from directive
        70/156)
   A.1 International classification of vehicle categories
Annex B (normative) Identification marking label
Annex C (informative) Example of CNG vehicle installation
        certificate
Annex D (normative) CNG vehicle initial inspection checklist
Annex E (informative) CNG Vehicle Periodic Inspection Checklist
Annex F (informative) Compressed Natural Gas - Characteristics
        and safety aspects
Annex G (informative) Leak detection methods
Annex H (informative) Component layout
Annex I (informative) Recommended vehicle instruction manual
        content

Applies to the design, construction, installation, operation and maintenance of compressed natural gas (CNG) systems where CNG is used wholly as a fuel for propulsion.