Vehicle Safety Features
- Vehicles and battery replacement modules should be listed or approved for operation.
- Current safety best practices apply to vehicles that are limited to 1-2 kg of hydrogen storage (<1000 SCF). Larger on-board vehicle storage may require consideration using automotive standards.
- Vehicle storage tanks should be designed to meet the intended pressure and cycle life in hydrogen service. The tanks should be certified by the manufacturer for their intended pressures and life cycle.
- A thermal pressure relief device should be provided to relieve the contents of an on-board storage tank when it is exposed to fire.
- An on-board control module should monitor process conditions and shut down the vehicle if unsafe conditions are detected.
- A leak detector should be provided to isolate the fuel source upon detection of an on-board hydrogen leak.
- Vehicle fuel systems should prevent the release of the entire storage contents in the event of a leak. Only a fire or failure at the tank valve should cause the release of the entire storage contents.
- Maintenance of vehicle fuel systems should include an inert gas purge procedure prior to returning to service. A mixture of hydrogen and air in the high-pressure fuel system should be avoided.