This incident occurred at the hydrogen production and storage unit of (probably) a power plant using hydrogen as a coolant of the turbine-generator system. Hydrogen was produced probably by water electrolysis (the source does not say it) and stored in 6 steel tanks. One of the six hydrogen storage tanks exploded killing a staff member. The investigation determined that a mixing of hydrogen and oxygen occurred in the tank. The needle valve of the hydrogen and oxygen pressure regulator as jammed, and the oxygen leaked into the hydrogen main supply line and entered the hydrogen tank.

A gas mixture (25% nitrogen, 73% of hydrogen, 2% methane) leaked, due to the ejection of the check valve from its connection with the inlet pipe. A large amount of the gas mixed with air and ignited, probably due to sparks generated by the ejected check hitting a metal pipe. It followed an explosion. Its pressure wave hit a gas pipeline causing its fracture and a fire. After about 1 hour and 30 minutes the fire was under control. The shockwave from the explosion caused a gas pipe at the back of the workshop to crack and leak, causing a large fire.

A mixture of mainly carbon monoxide and hydrogen was released from a pipeline transferring process gases in a not further specified unit of a chemical plant, generating a flammable mixture which ignited possibly due to static electricity and resulting in 22 deaths and 8 injuries.

The safety cabinet with compressed hydrogen was located in a laboratory and used to supply hydrogen to an experimental facility. The safety cabinet was equipped with exhaust extraction. Due to a leak, technical assistance had been requested from the fire department. The head of laboratory shut off the electrical supply to the laboratory. Measurements showed that there was no potentially explosive atmosphere in the laboratory room.

The event occurred at manhole cover of a of a pilot plant reactor where hydrogenation had been performed in a hydrochloric aqueous solution. The reactor had been flushed three times with nitrogen (i.e. nitrogen injecting at 3.2 bars and then relieving). An employee opened the manhole cover of the reactor to take a sample of the reagent. . After opening it, a minor detonation occurred.According to the DECHEMA database, the investigations found out these following causes:1.

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 atmosphere.

A chemical mobile intervention unit intervened in the faculty to neutralize in an envelope sealed an experimental device likely to release hydrogen. The faculty was evacuated during the intervention.

On may 23, 1984 between 8:50 and 8:55 pm, employee #1, a dye beam operator, was drawing concentrated sulfuric acid into a plastic pail. He added to this pail the contents of a "drip pail" which had been located under the 55 gallon acid drum. The pail started "smoking" and exploded a few seconds later, sending a plume of acid to the ceiling about 20 ft. Up. Three other nearby employees and employee #1 received skin burns when the acid rained down upon them. A fourth, further away, went to the hospital to have his ear plugs removed.

Employee #1, a maintenance worker, was killed by a hydrogen blast while working inside a batch hydrogenation unit.

Ignition of hydrogen produced by washing slag in a tank for chlorosulfonic acid.