ISO 15500-1:2015

Road vehicles - Compressed natural gas (CNG) fuel system components - Part 1: General requirements and definitions

ISO 15500-1:2015 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. NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as fuel of 20 MPa [200 bar[1]] 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. [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2

Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 1: Exigences générales et définitions

General Information

• Status: Published
• Publication Date: 29-Nov-2015
• ICS: 43.060.40 - Fuel systems
• Technical Committee: ISO/TC 22/SC 41 - Specific aspects for gaseous fuels
• Drafting Committee: ISO/TC 22/SC 41/WG 3 - Fuel system components and refuelling connector for vehicles propelled by gaseous fuel
• Current Stage: 9092 - International Standard to be revised
• Start Date: 14-Feb-2023
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 15500-1:2000/Amd 1:2003 - Road vehicles - Compressed natural gas (CNG) fuel system components - Part 1: General requirements and definitions - Amendment 1
• Effective Date: 13-Aug-2011
• Revises: ISO 15500-1:2000 - Road vehicles - Compressed natural gas (CNG) fuel system components - Part 1: General requirements and definitions
• Effective Date: 13-Aug-2011

Overview

ISO 15500-1:2015 defines general requirements and terms for compressed natural gas (CNG) fuel system components used on road vehicles (as defined in ISO 3833). It establishes design principles, marking and instruction requirements, and material and construction expectations for components used in mono-fuel, bi-fuel and dual-fuel natural gas vehicles (NGVs). The standard is based on a reference service pressure of 20 MPa (200 bar) at 15 °C and treats all pressures as gauge pressures unless stated otherwise.

Key topics and requirements

• Scope and applicability
  • Applies to CNG fuel system components for vehicle use (natural gas per ISO 15403‑1).
  • Explicitly excludes LNG upstream components (to and including the vaporizer), fuel containers, stationary gas engines, container mounting hardware, electronic fuel management, and refuelling receptacles.
• Materials and construction
  • Components must be made of materials suitable for CNG; galvanic corrosion between dissimilar materials must be considered.
  • Joints must be gas-tight; disassemblable tapered thread fittings are recommended to be replaced after disassembly.
  • Threads for cylinder-attached components shall conform to cylinder neck thread standards.
  • Temperature service ranges are specified for engine compartments and on-board locations (moderate and cold ranges).
• Non‑metallic materials and corrosion
  • Seals, diaphragms and other non-metallic materials must pass oxygen ageing and immersion tests per ISO 15500-2.
  • Components exposed to weather must meet corrosion resistance tests in ISO 15500-2.
• Electrical and wiring
  • Wiring and electrical parts must meet automotive quality standards (ISO 6722-1 and ISO 6722-2) and be protected against chafing.
• Operation and safety features
  • Automatic fuel shut-off valves shall be closed when de‑energized.
  • Multifunctional components are addressed and should be verified against the relevant parts of the ISO 15500 series.
• Instructions and marking
  • Manufacturers must provide clear, country-appropriate installation, maintenance and safety instructions.
  • Required markings include manufacturer, part/model number, working pressure and temperature range, fuel type, flow direction, electrical ratings, certification symbol, type approval number, and serial/date code.

Applications and users

ISO 15500-1 is essential for:

• CNG component manufacturers (valves, regulators, fittings, lines, filters)
• Vehicle OEMs and system integrators designing NGV fuel systems
• Test laboratories and conformity assessment bodies
• Certification agencies, regulators and aftermarket installers It helps ensure safety, interchangeability and compliance of vehicle CNG components across markets.

Related standards

• ISO 15500 series (Parts 2–20 covering tests and component-specific requirements)
• ISO 15501-1 (CNG fuel system safety requirements)
• ISO 15403-1 (Natural gas quality for vehicle fuel)
• ISO 6722-1 / ISO 6722-2 (automotive wiring)
• ISO 3833 (vehicle types and definitions)

Keywords: ISO 15500-1, CNG fuel system components, compressed natural gas, NGV, CNG standards, service pressure 20 MPa, vehicle CNG components.

Standards Content (Sample)

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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
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
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
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
...