ISO 15500-17:2021

Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible fuel line

This document specifies tests and requirements for the flexible fuel line, a compressed natural gas (CNG) fuel system component in accordance with SAE J517 (100R8 hose) or JIS B 8362 intended for use on the types of motor vehicles defined in ISO 3833. This document 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.

Véhicules routiers — Composants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 17: Tuyauterie flexible pour combustible

General Information

• Status: Published
• Publication Date: 30-Nov-2021
• 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
• Completion Date: 14-Feb-2023

Relations

• Revises: ISO 15500-17:2012/Amd 1:2016 - Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible fuel line — Amendment 1
• Effective Date: 09-Jun-2018
• Revises: ISO 15500-17:2012 - Road vehicles — Compressed natural gas (CNG) fuel system components — Part 17: Flexible fuel line
• Effective Date: 09-Jun-2018

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 15500-17
Third edition
2021-12
Road vehicles — Compressed natural
gas (CNG) fuel system components —
Part 17:
Flexible fuel line
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 17: Tuyauterie flexible pour combustible
Reference number
ISO 15500-17:2021(E)
© ISO 2021

---------------------- Page: 1 ----------------------
ISO 15500-17:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 15500-17:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . . 2
5 Construction and assembly .2
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 Continued operation . 4
6.4 Bending . 4
6.5 Pull off . 4
6.6 Electrical conductivity . 5
6.7 Permeability . 5
6.8 Automotive fluid . 5
6.9 Verification of hose cover perforations . 6
6.10 Vibration resistance . . 7
6.10.1 General . 7
6.10.2 Method of test . 7
Bibliography . 8
iii
© ISO 2021 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 15500-17:2021(E)
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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
This third edition cancels and replaces the second edition (ISO 15500-17:2012), which has been
technically revised. It also incorporates the Amendment ISO 15500-17:2012/Amd 1:2016.
The main changes are as follows:
— serial number or data code changed from recommended to mandatory in Clause 4 "Marking";
— addition of requirements in Clause 5 "Construction and assembly";
— addition of the following tests:
— automotive fluids,
— verification of hose cover perforations,
— vibration resistance.
A list of all parts in the ISO 15500 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
  © ISO 2021 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 15500-17:2021(E)
Introduction
For the purposes of this document, all fuel system components in contact with natural gas have
been considered suitable for natural gas as defined in ISO 15403-1. However, it is recognized that
miscellaneous components not specifically covered herein can be examined to meet the criteria of this
document and tested according to the appropriate functional tests.
All references to pressure in this document are considered to be gauge pressures unless otherwise
specified.
1)
This document is based on a service pressure for natural gas used 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.
5 2
1) 1 bar = 0,1 MPa = 10 Pa 1 MPa = 1 N/mm .
v
© ISO 2021 – All rights reserved

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 15500-17:2021(E)
Road vehicles — Compressed natural gas (CNG) fuel system
components —
Part 17:
Flexible fuel line
1 Scope
This document specifies tests and requirements for the flexible fuel line, a compressed natural gas
(CNG) fuel system component in accordance with SAE J517 (100R8 hose) or JIS B 8362 intended for use
on the types of motor vehicles defined in ISO 3833.
This document 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15500-1, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 1: General
requirements and definitions
ISO 15500-2:2016, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:
Performance and general test methods
ISO 15500-19, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 19: Fittings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15500-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
1
© ISO 2021 – All rights reserved

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ISO 15500-17:2021(E)
4 Marking
Marking of the component shall provide sufficient information to allow the following to be traced:
a) the manufacturer’s or agent’s name, trademark or symbol;
b) the model designation (part number);
c) the working pressure or pressure and temperature range;
d) the serial number or date code.
The following additional markings are recommended:
— the direction of flow (when necessary for correct installation);
— the type of fuel;
— electrical ratings;
— the symbol of the certification agency;
— the type approval number;
— a reference to this document.
NOTE This information can be provided by a suitable identification code on at least one part of the component
when it consists of more than one part.
5 Construction and assembly
The flexible fuel line shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and
with the tests specified in Clause 6. Tolerances should follow the specifications of ISO 15500-2.
5.1 The nominal hose diameter shall refer to the finished internal diameter ±0,65 mm for sizes up
to and including 20 mm and ±1,25 mm for sizes over 20 mm. A tapered plug gauge having a taper of
30 mm/m marked to indicate variation of 0,5 mm in diameter or other equivalent means may be used
for measuring inside diameter.
5.2 If an outer hose cover is used, it shall be constructed to minimize or prevent fluid penetration
into the inner plies, braids, or tube. The inner plies, braids, or tube shall be resistant to the effects of
common automotive fluids, as determined
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15500-17
ISO/TC 22/SC 41
Road vehicles — Compressed natural
Secretariat: UNI
gas (CNG) fuel system components —
Voting begins on:
2021-08-31
Part 17:
Voting terminates on:
Flexible fuel line
2021-10-26
Véhicules routiers — Composants des systèmes de combustible gaz
naturel comprimé (GNC) —
Partie 17: Tuyauterie flexible pour combustible
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 15500-17:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2021

---------------------- Page: 1 ----------------------
ISO/FDIS 15500-17:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 15500-17:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Marking . 2
5 Construction and assembly . 2
6 Tests . 3
6.1 Applicability . 3
6.2 Hydrostatic strength . 3
6.3 Continued operation . 4
6.4 Bending . 4
6.5 Pull off . 4
6.6 Electrical conductivity . 5
6.7 Permeability . 5
6.8 Automotive fluid . 5
6.9 Verification of hose cover perforations . 6
6.10 Vibration resistance . 7
6.10.1 General. 7
6.10.2 Method of test . 7
Bibliography . 8
© ISO 2021 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 15500-17:2021(E)

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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 41,
Specific aspects for gaseous fuels.
This third edition cancels and replaces the second edition (ISO 15500-17:2012), which has been
technically revised. It also incorporates the Amendment ISO 15500-17:2012/Amd 1:2016.
The main changes compared to the previous edition are as follows:
— serial number or data code changed from recommended to mandatory in Clause 4 "Marking";
— addition of requirements in Clause 5 "Construction and assembly";
— addition of the following tests:
— automotive fluids,
— verification of hose cover perforations,
— vibration resistance.
A list of all parts in the ISO 15500 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 15500-17:2021(E)

Introduction
For the purposes of this document, all fuel system components in contact with natural gas have
been considered suitable for natural gas as defined in ISO 15403-1. However, it is recognized that
miscellaneous components not specifically covered herein can be examined to meet the criteria of this
document and tested according to the appropriate functional tests.
All references to pressure in this document are considered to be gauge pressures unless otherwise
specified.
1)
This document is based on a service pressure for natural gas used 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.
5 2
1) 1 bar = 0,1 MPa = 10 Pa 1 MPa = 1 N/mm .
© ISO 2021 – All rights reserved v

---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15500-17:2021(E)
Road vehicles — Compressed natural gas (CNG) fuel system
components —
Part 17:
Flexible fuel line
1 Scope
This document specifies tests and requirements for the flexible fuel line, a compressed natural gas
(CNG) fuel system component in accordance with SAE J517 (100R8 hose) or JIS B 8362 intended for use
on the types of motor vehicles defined in ISO 3833.
This document 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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15500-1, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 1: General
requirements and definitions
ISO 15500-2:2016, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:
Performance and general test methods
ISO 15500-19, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 19: Fittings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15500-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
© ISO 2021 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO/FDIS 15500-17:2021(E)

4 Marking
Marking of the component shall provide sufficient information to allow the following to be traced:
a) the manufacturer’s or agent’s name, trademark or symbol;
b) the model designation (part number);
c) the working pressure or pressure and temperature range;
d) the serial number or date code.
The following additional markings are recommended:
— the direction of flow (when necessary for correct installation);
— the type of fuel;
— electrical ratings;
— the symbol of the certification agency;
— the type approval number;
— a reference to this document.
NOTE This information can be provided by a suitable identification code on at least one part of the component
when it consists of more than one part.
5 Construction and assembly
The flexible fuel line shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and
with the tests specified in Clause 6. Tolerances should follow the specifications of ISO 15500-2.
5.1 The nominal hose diameter shall refer to the finished internal diameter ±0,65 mm for sizes up
to and including 20 mm and ±1,25 mm for sizes over 20 mm. A tapered plug gauge having a taper of
30 mm/m marked to indicate variation of 0,5 mm in diameter or
...