The Microbiological Anaerobic Chamber of approximately 2 m3 capacity was containing an explosive mixture of hydrogen and air. A fire followed the explosion, but was rapidly extinguished by staff using fire extinguishers, prior to the arrival of fire service personnel. The pressure wave from the explosion blew windows out of the laboratory, with glass hitting a passer-by on a path outside, and glass shards landing up to 30 m away.

A shift supervisor received severe burns and later died after a flexible hose used to transfer hydrogen to the catalytic reformer was over-pressurised and caught fire.Hydrogen is supplied from three modules each consisting of 12 x 1m3 cylinders at 150 bar (2205 psig) pressure. Each cylinder is fitted with a needle valve and the twelve are connected together with steel tubing. Each module has a filling connection (with no pressure regulator) and a discharge connection equipped with a pressure regulator and a pressure safety relief valve set at 14 bars (206 psig) pressure.

The explosion occurred when a spark from welding equipment ignited flammable vapours from a 415,000-gallon (ca. 1.5 million of litres) sulfuric acid storage tank at the refinery.The investigation showed that the explosion was caused by the ignition of hydrogen leaking from the tank as result from years of neglect. Hydrogen is produced when sulfuric acid comes into contact with the steel tanks.One worker was killed and eight other workers were injured.

A hydrogen explosion caused burns contaminated with radioactive dust to a member of the plant's maintenance crew. Three other workers escaped injury.The accident occurred in the basement of the plants turbine building during work on an out-of-service recombiner (an equipment that combines hydrogen and oxygen to make water. A review team has found that a leak in a valve on the system allowed the hydrogen gas to build up in the pipe where the employee was working with a grinding wheel.

A tank "filled with low-pressure hydrogen" exploded at a food manufacturing plant, killing three workers. The accident occurred when the workers were welding inside the tank after clearing hydrogen to install a hydrogen measuring device. The tank, seven metres high and two and half metres wide, was destroyed by the explosion. Police investigated the exact cause of the accident and suspected the sparks from the welding work caused the explosion with the remaining hydrogen inside the tank as the employees failed to completely remove the hydrogen before conducting the work.

The event occurred at a de-sulfurisation reactor unit. Hydrogen leaked into the reactor causing an explosion. The Fire spread rapidly.

on a Sunday morning, in a ceramic factory, a leak on a 100 m tank containing 370 kg of hydrogen caused an explosion. The generated pressure wave causes significant damage to exterior buildings (broken windows, fire starts); a fragment of the tank was found several hundred meters from the place of the explosion. The human toll shows 23 people from the public who were slightly injured. A fire broke out soon after on the site and threatened storage of acetylene and hydrogen fluoride.

A potentially explosive situation was reported by safety inspectors at a nuclear waste tank. The waste slurry had formed a thick crust which was trapping hydrogen being continuously generated underneath. The tank has uncertain chemistry and contents.According to the New Scientist article (see references) four million litres of waste "have been behaving mysteriously inside the underground storage tank. Every few months the tank burps releasing a burst of hydrogen and nitrous oxide."Calculation estimated a potential for an explosion equivalent to 230 kilos of TNT.

The incident occurred during a temporary shutdown of the distillate hydro-treatement unit. The crude oil distillation units main column overhead product was pumped to a gasoline storage tank via the straight run gasoline rundown line. When restarting the distillate hydro-treatement unit, a valve in the start-up line to the high pressure separator branching off the crude oil distillation unit main column overhead product line was opened before the line to tank was closed.Hydrogen gas at a pressure of 30 bars consequently reached the tank, caused an overpressure and caused substantial damage.

An explosion or fire occurred in a hydro-treatment unit which was processing Fluid Catalytic Cracking feedstock. It was caused by a failure in a pipe downstream from a separator, resulting in the release and ignition of hydrogen and hydrocarbons in the unit area.