ISO 23273-2:2006
(Main)Fuel cell road vehicles — Safety specifications — Part 2: Protection against hydrogen hazards for vehicles fuelled with compressed hydrogen
Fuel cell road vehicles — Safety specifications — Part 2: Protection against hydrogen hazards for vehicles fuelled with compressed hydrogen
ISO 23273-2:2006 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 23273-2:2006 does not apply to manufacturing, maintenance and repair. The requirements of ISO 23273-2:2006 address both normal operating (fault free) and single fault conditions of the vehicles.
Véhicules routiers alimentés par pile à combustible — Spécifications de sécurité — Partie 2: Protection contre les dangers de l'hydrogène pour les véhicules utilisant de l'hydrogène comprimé
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 23273-2
First edition
2006-05-15
Fuel cell road vehicles — Safety
specifications —
Part 2:
Protection against hydrogen hazards for
vehicles fuelled with compressed
hydrogen
Véhicules routiers alimentés par pile à combustible — Spécifications de
sécurité —
Partie 2: Protection contre les dangers de l'hydrogène pour les
véhicules utilisant de l'hydrogène comprimé
Reference number
ISO 23273-2:2006(E)
©
ISO 2006
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ISO 23273-2:2006(E)
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ii © ISO 2006 – All rights reserved
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ISO 23273-2:2006(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
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International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 23273-2 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 21,
Electrically propelled road vehicles.
ISO 23273 consists of the following parts, under the general title Fuel cell road vehicles — Safety
specifications:
⎯ Part 1: Vehicle functional safety
⎯ Part 2: Protection against hydrogen hazards for vehicles fuelled with compressed hydrogen
⎯ Part 3: Protection of persons against electric shock
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INTERNATIONAL STANDARD ISO 23273-2:2006(E)
Fuel cell road vehicles — Safety specifications —
Part 2:
Protection against hydrogen hazards for vehicles fuelled with
compressed hydrogen
1 Scope
This part of ISO 23273 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 part of ISO 23273 does not apply to manufacturing, maintenance and repair.
The requirements of this part of ISO 23273 address both normal operating (fault free) and single fault
conditions of the vehicles.
2 Normative references
The following referenced documents are indispensable for the application 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 17268, Compressed hydrogen surface vehicle refuelling connection devices
ISO 23273-1, Fuel cell road vehicles — Safety specifications — Part 1: Vehicle functional safety
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
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ISO 23273-2:2006(E)
3.4
excess flow valve
valve which automatically shuts off or limits the gas flow when the flow exceeds a set design value
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 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 working pressure at which a component or system may be normally operated without damage,
including leakage and deformation
NOTE The maximum allowable working pressure is used in determining the setting of pressure-limiting/relieving
devices installed to protect the part or system from accidental over-pressurizing.
3.13
nominal working pressure
pressure level at which a component typically operates
NOTE For fuel containers it is the settled pressure at a uniformed temperature of 15 °C (288 K) for a full fuel
container.
3.14
purge
process to eliminate unwanted gas constituents from the hydrogen system
3.15
temperature-triggered pressure relief device
PRD
excessive temperature-triggered, activated non-reclosing resealing device which vents gas to protect the fuel
container from rupture when subjected to a standard fire test
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ISO 23273-2:2006(E)
4 Environmental and operational conditions
The requirement given in this part of ISO 23273 shall be met across the range of environmental and
operational conditions for which the vehicle is designed to operate, as specified by the vehicle manufacturer.
5 Design and performance requirements of the fuel system
5.1 General
The fuel system consists of a high pressure section, where the inner pressure is the same as in the fuel
container, and an intermediate to low pressure section, where the inner pressure is lower than that of the high
pressure section.
The fuel system shall be equipped with:
⎯ a fire protection system incorpora
...
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