ISO 15500-1:2015

INTERNATIONAL ISO
STANDARD 15500-1
Second edition
2015-12-01
Road vehicles — Compressed natural
gas (CNG) fuel system components —
Part 1:
General requirements and definitions
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 1: Exigences générales et définitions
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Construction and assembly . 4
5 Electrical equipment and wiring . 5
6 Instructions . 5
7 Marking . 5
Bibliography . 7
Foreword
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Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific
aspects for gaseous fuels.
This second edition cancels and replaces the first edition (ISO 15500-1:2000), which has been
technically revised.
It also incorporates the Amendment ISO 15500-1:2000/AMD 1:2003.
ISO 15500 consists of the following parts, under the general title Road vehicles — Compressed natural
gas (CNG) fuel system components:
— Part 1: General requirements and definitions
— Part 2: Performance and general test methods
— Part 3: Check valve
— Part 4: Manual valve
— Part 5: Manual cylinder valve
— Part 6: Automatic valve
— Part 7: Gas injector
— Part 8: Pressure indicator
— Part 9: Pressure regulator
— Part 10: Gas-flow adjuster
— Part 11: Gas/air mixer
— Part 12: Pressure relief valve (PRV)
iv © ISO 2015 – All rights reserved

— Part 13: Pressure relief device (PRD)
— Part 14: Excess flow valve
— Part 15: Gas-tight housing and ventilation hose
— Part 16: Rigid fuel line in stainless steel
— Part 17: Flexible fuel line
— Part 18: Filter
— Part 19: Fittings
— Part 20: Rigid fuel line in material other than stainless steel
INTERNATIONAL STANDARD ISO 15500-1:2015(E)
Road vehicles — Compressed natural gas (CNG) fuel
system components —
Part 1:
General requirements and definitions
1 Scope
This part of ISO 15500 specifies general requirements and definitions of compressed natural gas fuel
system components, intended for use on the types of motor vehicles as defined in ISO 3833. It also
provides general design principles, and specifies requirements for instructions and marking.
This part of ISO 15500 is applicable to vehicles (mono-fuel, bi-fuel, or dual-fuel applications) using
natural gas in accordance with ISO 15403-1. It is not applicable to the following:
a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;
b) fuel containers;
c) stationary gas engines;
d) container mounting hardware;
e) electronic fuel management;
f) refuelling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to
meet the criteria of this part of ISO 15500 and tested according to the appropriate functional tests.
NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless
otherwise specified.
1)
NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as fuel of 20 MPa [200 bar ]
settled at 15 °C. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor
(ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 6722-1, Road vehicles — 60 V and 600 V single-core cables — Part 1: Dimensions, test methods and
requirements for copper conductor cables
ISO 6722-2, Road vehicles — 60 V and 600 V single-core cables — Part 2: Dimensions, test methods and
requirements for aluminium conductor cables
ISO 15500-2, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:
Performance and general test methods
ISO 15500-3, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 3: Check valve
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm
ISO 15501-1, Road vehicles — Compressed natural gas (CNG) fuel systems — Part 1: Safety requirements
3 Terms and d
...