A fire broke out following a hydrogen leak on the cyclododecane unit in a chemical plant. A plume of smoke became visible outside the site. The fire was brought under control by putttng the unit in safe mode, implementing the internal resources available on site (monitor lance, sprinkler ring and extinguishers), and finally by the inervention of the internal firefighters. The staff was evacuated and the internal crisis unit triggered. The fire was extinguished in 30 minutes. The post-incident analysis revealed a hole in the connection of the vent manifold, upstream of the evacuation pipe.

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.

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.

The event occurred in a desulfurisation unit for heavy oil (hydro-cracking, Isomax process). The hydrogen release took place from one of the heat exchanges, after the restart of the unit. The reason for the shutdown was for replacing the catalyst. A metallic ring of 1,42 m diameter previously deformed by during maintenance and by thermal cycling, was projected to more than 100 m distance. The hydrogen and the heavy oil contained in the pipe were expelled and exploded immediately, followed by a general fire on the unit.

The event was initiated by the burst of a rupture disc on a reactor during a hydrogenation process. The hydrogenation reaction occurs under pressure in a tank containing 3,000 l of a mixture of ethanol (a flammable and toxic solvent), red hair dye, a catalyst (palladium on carbon) and hydrogen. As a result of the disk rupture and the following tank decompression, decompression, part of the tank content was expelled and landed on the roof of the building.The emergency action consisted in stopping the supply of hydrogen and to purge the tank with nitrogen.

In a plant producing calcium carbide (CaO + 3C -> CaC2 + CO), a dust collector clogged, probably due to the failure of the cleaning device (nitrogen nozzles) which allowed the dust to build a plug.During the procedure of introducing a poker through an inspection hatch at the lower level, a small explosion occurs and a large amount of dust is ejected through the vent. The cloud containing carbon monoxide and hydrogen ignited. The fire spread to the electrical cables supplying the equipment.

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.

The naphtha and hydrogen gas leaked out from the gasoline reformer at the Southwest Petroleum as the relief-valve was operated after its repair.Although the source (Asian database ADRC) does not mention it, by looking at the fatalities it can be assumed that the mixture took fire and/or exploded,

A fire occurred at a refinery hydrocracker plant involving a gauge glass and hydrogen gas oil.

A joint failure allowed a mixture of hydrogen and nitrogen into the atmosphere.Failure of double cone joint on waste heat boiler in synthesis loop caused release of synthesis gas at 28.7 MPa and 170 degrees C after shutdown for maintenance. There was no structural damage.