Hydrogen was accidentally produced inside the sealed container containing a used battery. The gas, along 6 days deformed the container. Firefighters equipped with breathing apparatus open the container remotely triggering a considerable explosion.

A sudden fire started in the refinery's hydrocracking unit at the hydrogen compressor of re refinery (India).

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 and a catalyst. A gasket would be responsible for the emission of the gas that then ignited.

The leak occurred on the inlet pipe (P=21 bar, T=320C) of the diesel desulfurization reactor of a refinery. Hydrogen and diesel fuel were released in the gas phase. The hydrocarbons contaminates neighbouring fields, local residents are informed.

A gaseous mixture of hydrogen (H2), methane (CH4) and ethane (CH3-CH3) at 54 bar was cooled in a heat exchanger upstream of a hydrogen purification system. The accident started with a double explosion followed by a fire.The heater used to regenerate the adsorbent beds of the purification unit had been repaired a few hours earlier, but the automatic heating mode had not been activated upon restart. Therefore, two regeneration cycles had been carried out cold, causing an overload of the adsorber and the fouling of the heat exchanger.

A hydrogen leak occurred on the hydrogen line of a hydro-desulfurization unit, followed by ignition . The failure was located on a supply manifold of the unit at a support beam. The unit was shut down.The accident was caused by external corrosion which had developed at a support point, under the pipe insulation. A regular thinning of the piping was observed over a length of 450 mm on the lower semi-circumference. The maximum thickness loss was 6.5 mm. The mechanical analysis concluded that the operating pressure was sufficient to cause this initial failure in the weakened area.

The truck was carrying 25 m3 of liquid hydrogen and was parked in the parking lot of a road restaurant. The hydrogen escaped through the safety devices of the tank and then dispersed (the weather was wet and there is fog). Technicians from the charter company degassed the tank until the leak stopped, then escorted the truck to a technical centre. A crack in the inner tank causing a pressure build-up could be the cause of the accident.

Hydrogen leaked from an analyser and ignited .On-site staff isolate the leak. As the leak was very quickly isolated, the amount of hydrogen released was negligible. Event no. 35501 of the French database ARIA (accessed December 2020) https://www.aria.developpement-durable.gouv.fr/accident/35501/

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 rack cool. The rack of the bottles was empty after four hours and the rescue operation ends at noon after the cylinder rack has been checked by an expert from the gas supply company. The residents returned to their homes and the plant's activity restarted one hour later.

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 95% hydrogen, 4% methane and 1% nitrogen. The line was located in a rack within the cold sector, at a height of 6 m. The personnel shut down the steam cracker and isolated the sector and the units cuts were sent to the flare system.