In a newly developed hydrogen train for local transport, a pressure switch from WIKA plays a crucial role. Within the scope of pressure monitoring, it performs the central safety function in the H2 supply system through the journey.
The benefits of hydrogen in rail transport are rather unknown to the general public. Even if the first trains with H2 fuel cells already are in operation. They operate on non-electrified railway lines and replace the diesel trains that were used before.
Tanks based on carbon fibre composite technology
The tank capacity for the hydrogen should be adapted to the distances. Among WIKA?s customers has specialised in individual fuel storage systems for H2 vehicles. Their cylindrical tanks are based on carbon fibre composite technology. They’re therefore extremely robust yet have a relatively low weight compared to steel vessels.
Tanks of the type may also be installed in the hydrogen-powered train mentioned in the beginning. This multiple-unit train, created for commuting traffic, is filled with the hydrogen at a special terminal. The tank pressure is 300 to 350 bar. While driving, it should be reduced to a single-digit value for the supply to the fuel cell. This is done via a pressure regulation unit downstream of the storage system.
Pressure switch in hydrogen-powered train switches the drive system off
Suitable for use in a new type of hydrogen-powered train regarding safety ? the model PXA pressure switch from WIKA.
The pressure switch model PXA meets the requirements of the hydrogen-powered train application. With the monitoring the of tank pressure and pressure regulation in the hydrogen-powered train, the customer uses the pressure switch model PXA for the safety function. The miniature instrument switches off the H2 propulsion system in two cases, depending on the function:
if the tank is at risk of emptying
if the pressure becomes too high once the hydrogen is used in the propulsion system
Such an emergency protection could also be realised with a pressure sensor and a software. But also for trains this solution will be very complicated. It is also rated with an increased risk of error when compared to a switch-based safety function.
SIL-3 approval made the case for its use
The customer didn’t decide on the model PXA because of its measurement quality alone. The pressure switch was also considered right for the task in the hydrogen-powered train due to its SIL-3 suitability. It thus easily meets the safety-related market requirements for the H2 application (SIL-2).
Flameproof enclosure (?Ex d?) and compact design
The PXA has also been designed for ambient temperatures from -40 �C to +85 �C. In addition, the pressure switch has IECEx approval ?Ex d? (flameproof enclosure), that your customer requires as standard. An additional advantage of this instrument: The PXA could possibly be easily built-into the storage system because of its extremely compact design.
Note
diaphragm seal about hydrogen and on the pressure switch model PXA can be found on the WIKA website. In case you have any questions, your contact will gladly gelp you.
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