Hydrogen should also not be allowed to leak into the cooling circuit. For all hydrogen carrying components, use the smallest possible reject leak rate in the range of 10-5 mbar∙ l/s, very similar to the settings for CNG / LNG components. There is hardly any way around test gas-based methods when hydrogen is used. Some fuel cell components are best tested with short cycle times in a vacuum chamber. For sub-assembled FCV systems like hydrogen tank systems, automated robotic sniffer leak testing is recommended.
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