HIAD Nature Event - Release Type: Gas

Furnace tube leak caused excessive heat on H2 tube causing rupture

Overpressure caused a cylinder head of a gas compressor to fail causing release of hydrogen followed by a fire during the start-up of the compressor after maintenance.

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.…

A fire started in a refinery's gas oil desulfurization unit. The purpose of this unit is to separate sulfur from hydrocarbons and to do so, the latter are raised to 340C in the presence of hydrogen…

The event took place in the on one out of the seven reactors for ammonia synthesis. The day of the accident, preparation works for the decennial pneumatic test (previous pneumatic test was carried…

During the isomerization of wax in a lube oil plant, the high pressure reactor ruptured, releasing its contents. The released gas ignited and a fire developed in the plant area where operators and…

The leak ignited at the seal located between the bottom and the body of a heat exchanger of a desulfurization unit of a refinery. The fire is alimented by the leaking fuel under pressure for about…

Hydrogen ignition during welding on a VSC-24 spent fuel cask Pursuant to 10 CFR 72.210 - fuel in an independent spent fuel storage installation at its Point Beach Nuclear Power Plant. The inspection…

A fire, fuelled by a mixture of gasoline and hydrogen, occurred on a heat exchanger located at 15 m height in a gasoline processing unit of a refinery. The operator triggered the emergency plan. Site…

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,…

An explosion occurred while inflating a balloon with hydrogen gas. The News reported the involvement of the hydrogen bottle.

An accident occurred prior to the performance of a hydrogen-oxygen balloon demonstration, seriously injuring the demonstrator, who suffered painful second-degree burns to his right forearm and had to…

The hydrogen possible leaked and ignited from a tank which was inside a car parked in a hospital underground parking garage. The tank was supposed to be used for launching a weather balloon. Two…

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…

A hydrogen car caught fire at a hydrogen fuelling station. During refuelling of a H2-fueled car the owner heard an abnormal noise and opened the fuel filler door to investigate. A small fire then…

An explosion and fire occurred at a reciprocating recycle hydrogen compressor during commissioning of a new Diesel hydrotreatement Unit. It happened during the reactor pre-sulphidisation step, when…

An explosion occurred in hydrogen compressor, due to rupture of 4 inch suction pipeline to the compressor. "Hydrogen...exploded and continued to burn until it was extinguished".3 fatalities.

[NOTE: the sources are not completely clear in describing the system involved in this incident ; the following is the most plausible option according to HIAD validator]The explosion happened in two…

A huge car crash take place on the highway A4/E70 between Padua and Trieste, North of Italy. More than 250 cars were involved. More than 13 persons died and more than 90 injured. The main reason of…

Hydrogen explosion at a chlorine chemical production plant (Seveso-classified) The plant had been shut down for two weeks, and maintenance works were ongoing. Two subcontractor employees were…