The accident took place when replacing a pallet of empty hydrogen cylinders with a new full one. The pallet in service (almost empty) was not disconnected from the gas supply line. When the operator in charge of handling (fork lift) begun to remove the pallet in service from its position, he teared off the hose connecting it to the pressure relief system. The pressurised hydrogen in the pipes and in the pallet escaped and ignited. The intervention of the teams from the plant and external emergency services extinguished the fire in 1h45.

An employee was attempting to re-weld a lifting point on a brazing furnace cover. He was using a tungsten inert gas (TIG) welding machine to build up an attachment point on the cover when an explosion occurred. Its force lifted the furnace cover and propelled it against the employee. There were no witnesses to the incident. The furnace had apparently not been evacuated completely of gaseous hydrogen, and this may have triggered the explosion.

An explosion occurred in the Heat Treatment Shop of this site. The explosion was centered in the electrical control panel of the High Velocity Oxy Fuel (HVOF) thermal spraying equipment. The violent explosion propelled shrapnel, killing one person present. Four further personnel were injured.

Due to the road accident there was the formation of a fire that involved the hydrogen tube trailer and some other vehicles (involved in the incident).Moreover due to the crash there was the formation of a hydrogen jet-fire from one cylinder of the tube trailer (in proximity of the valve of the lowest cylinders) and a long longitudinal crack (about 10 cm) formed along one cylinder near the tube trailer back wheels.

Workers were performing demolition on a disused furnace. While removing a 10 inch valve from a pipe used to supply coke gas fuel to the furnace, flammable liquid was unexpectedly released and ignited. The flammable material consisted of methane, hydrogen, carbon monoxide and solid coke. The workers were not aware that there might be flammable material still in the pipe. The blast occurred when gas from the line came into contact with heaters which have open flames to keep nearby equipment from freezing. The accident resulted in the death of two workers and 5 others were injured.

The accident occurred during the maintenance of a sulfuric acid storage tank in an industry for the fertilizers production. The maintenance works consisted in cutting operations (to remove some plates fastened with bolts) by using oxyacetilenic flame on the storage tankOn the internal surface of a tank containing sulfuric acid a corrosion phenomenon associated with the accumulation of hydrogen occurred owing to poor maintenance. The hydrogen was then ignited by the oxyacetylenic flame.

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 the accident was fog on a highway. A truck with hydrogen cylinders was also involved in the accident: due to the high temperature caused by the conventional fire, the valve system of the hydrogen bottles fused, with consequence hydrogen release and ignition.

In an chlorine production plant, vented chlorine and hydrogen, auto ignited when the hydrogen concentration was allowed to exceed 5% and the mixture mixed with air.

The last flight of the Space Shuttle Challenger ended 73 seconds after the launch in an explosive burn of hydrogen and oxygen propellants that destroyed the External Tank and exposed the Orbiter to severe aerodynamic loads that caused complete structural breakup. All seven crew members perished.