A leak occurred at a of a liquid withdrawal valve of a liquid hydrogen storage tank. The hydrogen escaped at the flange between the valve body and the upper part of the valve (flange with tongue and groove). 40 kg of hydrogen were lost.The accidental release was due to the use of bolts different from those prescribed. By using the wrong ones (old bolts), the bolt material was able to flow at the specified tighteningtorque. This meant that there was insufficient tightening torque, which led to a leak.

The company affected manufactures valves and other hydrogen-storage components, equipment tests. It has offers as well a testing laboratory. The accident happened during testing of a hydrogen tank. A dull bang and a huge pressure wave was felt kilometres away. News report massive damage to the test facility, but a very small fire. Still according to the news, the most probable cause emerging from the investigation is the over-pressuring of the tank due to an erroneous connection of a compressed air hose.

A 9000 gal (34 m3) LH2 storage tank exploded during repair of the vent stack. Few days before the explosion, the tank had been filled with LH2, but later on the hydrogen released and ignited at the tank pressure control system, damaging the vent stack. To perform the required repairs, the tank had to be emptied. To this purpose the vessel was purged with nitrogen gas to display the LH2 by letting it boiling. However, the pressure inside the vacuum jacket increased because of the opening the vacuum valve. This pressure increase eventually led to the catastrophic tank rupture.

Following a loss of power the failure of a backup battery causes an alarm in a hydrogen storage facility. Consequently, a valve on the purge circuit and 30 m3 of hydrogen is released to the atmosphere.

Fires and chain reactions involved more than 100 cylinders of hydrogen or other gases in a storage system. The fire lasted for more than 5 hours and the neighbourhood has been affected by flying ignited debris projected by the explosion.

Employees were refilling a rack of 15 hydrogen cylinders that were connected together on a steel pallet with railings. A leak developed at a valve and the pressurized hydrogen ignited. Operations activated a deluge sprinkler system, which turned off the compressor that was pumping in hydrogen. The fire was contained by the sprinkler system as the hydrogen pressure bled off. There were no injuries.

Leakage of gas from blow-off pipe for depressurization while filling hydrogen in cylinder.

A fire and a series of explosions occurred on a petrochemical plant, causing damage to process vessels, containment walls and process utility piping. It is believed that lightning struck a two story tall compressed hydrogen tank, which caused explosion in an aluminum alkyls distillation vessel. It was not known why the hydrogen tank exploded as it was equipped with relief valves and was grounded.

A small quantity of hydrogen gas leaked out of a pipe and caught fire. The danger of an explosion was averted by the safety crew who put out the fire and switched the gas flow to an alternative line.

Fire in bulk hydrogen storage compound. Pressure gauge shut off valve spindle blown out (could be completely unscrewed and removed). The subsequent leak ignited by unknown source. No injuries sustained by personnel. Fire extinguished by station staff.