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Automatic Shut-off Valve

An automatic shut-off valve should be located in liquid hydrogen withdrawal piping as close to the vessel as practical. Per NFPA 55, automatic shut-off valves aren't required on tanks smaller than 2,000 gallons, but they are recommended for all tanks.

On vessels over 2,000 gallons capacity, this shut-off valve shall be operable by remote control.

There should not be any connections, flanges, or other appurtenances (other than a welded manual shut-off valve) allowed in the piping between the shut-off valve and its connection to the vessel.

References

G-095-2004, ANSI/AIAA Guide to Safety of Hydrogen and Hydrogen Systems, can be purchased from www.aiaa.org.

NFPA 55, Standard for the Storage, Use, and Handling of Compressed Gases and Cryogenic Fluids in Portable and Stationary Containers, Cylinders, and Tanks

This material was prepared as an account of work sponsored by an agency of the United States Government.
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The portal brings together and enhances the utility of a variety of tools and web-based content on the safety aspects of hydrogen and fuel cell technologies to help inform those tasked with designing, approving or using systems and facilities, as well as those responding to incidents.

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