Incorrect Relief Valve Set Point Leads to Explosion

First Name
Andy
Last Name
Piatt

Incident Synopsis
During a standard testing procedure, a 3,000 psig relief valve actuated at normal line pressure, releasing gaseous H2. The gaseous H2 combined with air, resulting in an explosion which damaged the test facility.

Cause
The relief valve was improperly set to open at line pressure, and the inspection was inadequate in that it didn't identify this error. Contributing cause was poor design of the venting system, which was installed in a horizontal position, causing inadequate venting and buildup of static electricity.

Hydrogen Storage Vessel Over-Pressurized

First Name
Andy
Last Name
Piatt

Incident Synopsis
During development tests, a gaseous H2 test tank was over pressurized and ruptured. The tank dome was destroyed.

Cause
The pressure relief valves were set too high. In addition, the tank was not depressurized while being worked on. Safe distances, as required by the procedures for personnel safety, were not followed.

Pressure Relief Valve Triggered on Metal Hydride Storage Tank

First Name
Andy
Last Name
Piatt

A metal hydride storage system was refilled using compressed hydrogen in a closed lab environment. The tank system is an in-house development and is optimized for high hydrogen storage density and use with an air-cooled fuel cell. The system is equipped with a pressure relief valve that opens gradually at 35 bar to protect the tank from overpressure conditions. The tank itself is designed to adsorb 400 g of hydrogen at a pressure less than 15 bar.

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