A leak occurred while loading a semi-trailer carrying hydrogen gas cylinders. An employee closed the supply valve but the leak ignited and reached the trailer's tires. The vehicle caught fire, causing a plume of black smoke visible from a distance. The plant operator evacuated the personnel and activated the emergency response plan. The water sprayers in the filling station and the site was shut down. The firemen and the operator prevented the spread of the fire beyond the 3 semi-trailers parked at the loading station. After approximately 2 hours, the firemen brought the fire under control.

A detonation was heard and the hydrogen supply of the site was automatically shut down by the safety devices.The fire was caused by a hydrogen leak and led to the formation of a fireball at the end of a hose at the conditioning station. A plant employee had just disconnected the hose sued for the filling of a semi-trailer. He did so to be able to change a non-return valve which was vibrating noisily. The hydrogen supply had been stopped, the automatic system had been switched to manual mode and the hose had been drained and disconnected.

the fire was detected by an employee during the normal inspection tour, . It was caused by the ignition of a leak of process gas (hydrogen, methane and water vapour) from the reforming furnaces. The plant operator stopped the ammonia unit by manually triggering the safety emergency procedure. The natural gas supply was cut off, and this immediately extinguished the flame.The nitric acid unit was kept running at minimum rate. The hot ammonium nitrate solution and ammonium nitrate units are shut down due to lack of ammonia.

The fire, 1 m high fire occurred in a pipe at the inlet of the hydrodesulfurisation unit of a refinery. The fire was caused by the leak of the pipe content, hydrogen and diesel fuel. According to the first elements of observation, a leak on a bolted assembly (flange) at the level of an insulation gasket of the reactor would be at the origin of the incident.The fire was detected visually and was located 25 m above the ground. The personnel was evacuated. The operator did not extinguish the flame in order not to generate a hydrogen cloud, which is highly explosive.

The truck was delivering hydrogen to a steel products plant and contained from 1500 to 2000 gallons of liquid hydrogen (approximately 7000 to 9000 l). The hydrogen was being pumped from the trucks tank to a tank alongside the business, when the hydrogen vapour were vented and ignited. Witnesses spoke of a 'large explosive noise' (see references). The emergency services closed the traffic and evacuated several businesses, schools and homes for a few hours.

The hydrogen buffer tanks that exploded were part of an experimental facility experimenting generation of renewable hydrogen from a water electrolyzer coupled to solar panels.The three hydrogen tanks (40 m3 capacity each at pressures of 1,2 MPa one of them and 0,7 MPa the two others) were receiving the hydrogen produced by the electrolyzer. Firefighters said all three tanks were destroyed in the explosion; there was no fire, but the explosion was strong enough to send debris being scattered in an area well over 3,000 square meters.

The accident occurred at a distillate dewaxing Unit (MDDW) of the refinery, during the operation of regeneration of the catalyst. To perform this operation, both temperature and pressure have to be increased. After approximately six hours after having reached the correct regeneration conditions, the 10 inches pipe at the bottom to one of the two reactor experienced a guillotine break, and hot gas was released from both ends. The gas released consisted of 81% of hydrogen, 9.5% of methane and some light hydrocarbons. It rapidly ignited (0.7 sec), causing an explosion.

A diesel and gas leak (H2, H2S, CH4) occurred in a hydrodesulfurization unit (2,200 t/d). The leak location was on one of the boiler valves of the stabilization column. The released mixture (390 C / 35 bar) ignited, and due to the heat developed also other valves started leaking. The compressor was stopped and the column isolated. The fire was extinguished in 35 minutes.

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 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.