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HIAD Classification of the Physical Effects: Unignited Hydrogen Release


The leak occurred on a process pipe of a pressurized at 17 bar and located 3.5 m from the ground The gaseous mixture composed of hydrogen, methane and hydrogen sulfide (density: 0.6) was released to…
Hydrogen leak due to a fault with non-process related battery equipment.After reporting the hydrogen leak, fire crews have been called to a gas terminal. The leak was due to a fault with non-process…
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…
The event occurred at the factory producing multilayer circuit boards by a multistep dip operation. An employee inadvertently mixed 55 gal of 50 percent hydrogen peroxide into 110 gal of 30 percent…
A hydrogen compressor had a major malfunction resulting in serious cavitations, vibrations and dead heading of the 1st stage. The incident resulted in 5 of the 8 lower head bolts on the first stage…
damage of shipping containers of a ship, reaction of phosphor pentoxide with wine leads to phosphoric acid and hydrogen
high pressure spherical vessel, stress corrosion stressing by hydrogen, leakage along the weld, release of H2-CH4 mixture
One of the two dispensers at a refuelling station for buses shutdown at a refuelling station. The dispenser company were called and confirmed there was an issue with the dispenser. The station…
A tank of liquefied hydrogen felt down in a chemical plant.The tank, containing 100 m of liquid hydrogen, was installed on a concrete plate, which failed. The hydrogen started leaking from the valve…
The cracking happened in an ammonia plant, started up in 1970, on the pipe leading hot synthesis gas from the synthesis convertor to the first heat exchanger. This pipe was affected by six cracks and…
Chlorine was released in the liquefaction unit of a chlorine electrolysis plant, due to the rupture of a pipe. During the re-start phase of an electrolysis workshop in a chemical plant, chlorine (…
A fire broke out on a transformer transforming 225,000 V into 15,000 V in a metallurgical plant. This transformer supplies electrical power the site and to a neighbouring factory. In the following…
a hydrogen recycle compressor shut down unexpectedly, resulting in flaring activity with visible smoke.
Furnace tube leak caused excessive heat on H2 tube causing rupture
In a plastics production plant, a pallet containing 7 cylinders of nitrogen and 1 cylinder of hydrogen fell from a truck traveling in a logistics zone. The driver stopped the vehicle, cut off the…
The gas leak containing hydrogen (H2) and hydrogen sulfide (H2S) occurred at the upper isolation valve located at a high-pressure separator (300 bar) of an oil production unit in a refinery.…
Spillage of hydrogen and heavy gas oil at heavy oil hydrogenation desulfurization device due to insufficient heat treatment after welding valve:
In a petrochemical plant, a gas mixture at 270 bar made of 75% hydrogen (H2) and 25% methane (CH4) leaked through the bottom valve of a dryer of a resin production unit. After detection of the leak,…
Since the release could not be stopped by intervening at the leaking point, the fire brigade decided to vent the whole content of the pallet (246 m3) by gradually opening the valves and by keeping…
The release occurred on a pipeline inside a steam cracking unit located between two hydrogenation units. The gaseous mixture transported through this line (2" diameter, 30 bar, 40C) was composed of…
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