BS ISO 23273:2013 pdf download.Fuel cell road vehicles – Safetyspecifications – Protectionagainst hydrogen hazardsfor vehicles fuelled withcompressed hydrogen.
BS 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 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
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
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 M AWP
maximum working pressure at which a component or system may be normally operated without damage, including leakage and deformation.BS ISO 23273 pdf download.