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HIAD Classification of the Physical Effects: Unignited Hydrogen Release


Hydrogen leak occurred during a delivery of hydrogen at an automotive supplier. Rescue deployed a curtain of water and evacuated 82 employees from several companies within a radius of 50 m. The…
A leak occurred in a vehicle carrying 218 cylinders of hydrogen. The contents of 28 cylinders, 90 m of hydrogen, escaped. A security perimeter was set up with stop of the road and rail traffic.
A leak occurs on a hydrogen gas transport at a flange of 9 cylinders of 80 m. The producer of these cylinders decides to let it leak. No consequences to report.
hydrogen gas released from vent stack following failure of relief valve in pressure relief system on bulk hydrogen installation, no ignition and no injuries.
A leak occurred on a line connecting the hot separator to the cold separator of a refinery diesel desulfurization. The alert was given by the activation of the fixed H2S detector. The 30 bar pressure…
Leak of hydrogen at a refinery which may have been caused by a faulty compressor.
A truck-trailer carrying compressed hydrogen cylinders stopped on an autobahn and reported a hydrogen leaking from the cylinders. The highway was immediately closed in both directions. When the fire…
During maintenance work on a gas pipeline carrying hydrogen , a worker hears a leak at about at a bridge. The operator measures an concentration of 3% of the low flammability limit at few…
Fire due to hydrogen gas leakage.
A factory was evacuated after a tank began leaking hydrogen. No injuries were reported
Compressed hydrogen was released from a storage system due to the rupture of a Bourdon-type pressure gauge.
A hydrogen leak took place on a trailer carrying compressed hydrogen, located inside the fenced perimeter of a hydrogen station. According to the company managing the hydrogen delivery and refuelling…
A liquid hydrogen leak occurs in a steel plant on a 42000 l tank of liquid hydrogen. A sealing coupling was installed to stop the leak.
A hydrogen feed line ruptured without igniting at an oil refinery.
A leak of 700 l of gaseous hydrogen was detected around on a connection of a rack of cylinders on a trailer truck, in aircraft plant (classified Seveso, lower tier).
Gas leakage from a hydrogen cylinders pallet in transit.
The release occurred after the collision between a truck containing liquid hydrogen and a truck containing manganese dioxide on a highway.Due to the release, the traffic was interrupted for 4 hours…
A leak occurred on a rack containing 12 cylinders of hydrogen (50 l at 200 bar each) delivered by a lorry inside the fenced storage area of a bulb manufacturing plant. The plants safety manager…
A tractor-trailer carrying canisters of gaseous hydrogen gas crashed on a major East Coast route. Compressed hydrogen gas leaked from some of the containers after the truck rolled on its side.
The accidental hydrogen release occurred when testing the storage system connected to a PEM electrolyzer. The leak test consisted in filling the storage with hydrogen at step-wise increase of…
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