Fuel cell road vehicles -- Safety specifications -- Protection against hydrogen hazards for vehicles fuelled with compressed hydrogen

ISO 23273:2013 specifies the essential requirements for fuel cell vehicles (FCV) with respect to the protection of persons and the environment inside and outside the vehicle against hydrogen-related hazards. It applies only to such FCV where compressed hydrogen is used as fuel for the fuel cell system. ISO 23273:2013 does not apply to manufacturing, maintenance, and repair. The requirements of ISO 23273:2013 address both normal operating (fault-free) and single-fault conditions of the vehicles.

Véhicules routiers alimentés par pile à combustible -- Spécifications de sécurité -- Protection contre les dangers de l'hydrogène pour les véhicules utilisant de l'hydrogène comprimé

General Information

Status
Published
Publication Date
02-Jun-2013
Current Stage
6060 - International Standard published
Start Date
27-May-2013
Completion Date
03-Jun-2013
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ISO 23273:2013 - Fuel cell road vehicles -- Safety specifications -- Protection against hydrogen hazards for vehicles fuelled with compressed hydrogen
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INTERNATIONAL ISO
STANDARD 23273
First edition
2013-06-15
Fuel cell road vehicles — Safety
specifications — Protection against
hydrogen hazards for vehicles fuelled
with compressed hydrogen
Véhicules routiers alimentés par pile à combustible — Spécifications
de sécurité — Protection contre les dangers de l’hydrogène pour les
véhicules utilisant de l’hydrogène comprimé
Reference number
ISO 23273:2013(E)
ISO 2013
---------------------- Page: 1 ----------------------
ISO 23273:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013

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
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Tel. + 41 22 749 01 11
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Published in Switzerland
ii © ISO 2013 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 23273:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Environmental and operational conditions ............................................................................................................................. 3

5 Design and performance requirements of the fuel system ...................................................................................... 3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Components ............................................................................................................................................................................................... 3

5.3 Location and installation of components ......................................................................................................................... 4

5.4 Discharges ................................................................................................................................................................................................... 4

6 Test methods for determining flammability around the vehicle from fuel discharges ..............4

7 Complementary or alternative approach to verify hydrogen-related safety requirements ..4

7.1 General ........................................................................................................................................................................................................... 4

7.2 Hydrogen-related components and systems ................................................................................................................ 5

7.3 Integration of the hydrogen-related components and systems into the FCV ................................... 5

7.4 Verification of the safety concept ............................................................................................................................................ 5

8 Fuelling requirements .................................................................................................................................................................................... 5

8.1 General ........................................................................................................................................................................................................... 5

8.2 Fuelling inlet ............................................................................................................................................................................................. 5

Bibliography ................................................................................................................................................................................................................................ 6

© ISO 2013 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 23273:2013(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. 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. 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.

The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 21,

Electrically propelled road vehicles.

This first edition of ISO 23273 cancels and replaces ISO 23273-2:2006, of which it constitutes a minor revision.

iv © ISO 2013 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 23273:2013(E)
Fuel cell road vehicles — Safety specifications —
Protection against hydrogen hazards for vehicles fuelled
with compressed hydrogen
1 Scope

This International Standard specifies the essential requirements for fuel cell vehicles (FCV) with respect

to the protection of persons and the environment inside and outside the vehicle against hydrogen-

related hazards.

It applies only to such FCV where compressed hydrogen is used as fuel for the fuel cell system.

This International Standard does not apply to manufacturing, maintenance, and repair.

The requirements of this International Standard address both normal operating (fault-free) and single-

fault conditions of the vehicles.
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 17268, Gaseous hydrogen land vehicle refuelling connection devices

ISO 6469-2, Electrically propelled road vehicles — Safety specifications — Part 2: Vehicle operational safety

means and protection against failures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
air processing system

system that processes (i.e. that filters, meters, conditions, and pressurizes) the incoming air for the

fuel cell system
3.2
contaminant

substances within raw fuel, such as sulphur, that, at or above a specified concentration level, may poison

reaction catalysts
3.3
electric chassis

conductive mechanical structure of the vehicle, including all associated electric and electronic

components, whose parts are electrically connected and whose potential is taken as reference

3.4
excess flow valve

valve which automatically shuts off or limits the gas flow when the flow exceeds a set design value

© ISO 2013 – All rights reserved 1
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ISO 23273:2013(E)
3.5
fuel cell

electrochemical device that generates electricity by the conversion of fuel and an oxidant without any

physical or chemical consumption of the electrodes or electrolyte
3.6
fuel cell stack
assembly of two or more fuel cells, which are electrically connected
3.7
fuel cell system

system typically containing the following subsystems: fuel cell stack, air processing system, fuel

processing system, thermal management, water management, and their control system

3.8
fuel cell vehicle
FCV
vehicle that receives propulsion power from an on-board fuel cell power system

Note 1 to entry: The general term FCV also includes vehicles with an additional other source of propulsion power.

3.9
fuel processing system

system that converts (if necessary) and/or conditions the fuel as stored in the on-board fuel storage into

fuel suitable for operation in the fuel cell stack
3.10
fuel system

combination of the on-board fuel storage, the fuel processing system, and the fuel cell stack

3.11
main hydrogen shut-off valve
valve designed to automatically isolate the high-pressure hydrogen source
3.12
maximum allowable working pressure
MAWP
maximum
...

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