HIAD Classification of the Physical Effects: Hydrogen Release And Ignition

The utility production facilities (electricity, water, air, and steam) at a refinery were isolated from the power grid and switched to two turbine generators in anticipation of a storm. At 9:50 p.m…

The vessel affected by the incident was a gas storage used for the desulfurisation process. The desulfurization gas had high hydrogen content. The vessels had cracks in the upper transverse fillet…

In a chemical plant , a process gas leak (4% ammonia and 88% hydrogen) occurs during a purge operation. The cloud of gas ignites and explodes. An employee is killed.

A vertical cylindrical fired heater was used on the charge to a hydrodesulfurisation reactor. The flow was two phase at the heater inlet (hydrogen and hydrocarbon). The distribution of flow to the…

The event occurred at the flanges on the outlet of a desulfurization reactor, which was working under about 300 degrees C The flanges and bolts were cooled down by a large amount of rainwater which…

Hydrogen leak from a valve, with delayed ignition and consequent engulfing fire.The bonnet of a 2 inch valve on hydrogen quench line of a lube oil hydrotreater began to leak.The operative conditions…

A tractor - semitrailer with horizontally mounted cylinders filled with compressed hydrogen struck a northbound pickup truck that had veered in front of it.The tractor-semitrailer then went out of…

Malfunctioning of the non-return valve of the hydrogen compressor has caused the pressure between the hydrogen bottle and the compressor to rise to the maximum allowed pressure of 275 barg. As a…

A road tanker was being loaded with liquid hydrogen from a 15,000 gallon storage tank, when fire broke out after 1 inch rupture disk failed, ignition source was a loose connection in down stream…

The rupture disk installed on a liquid hydrogen tank failed, in a plant producing organic chemicals, during the weekly shut down. The hydrogen ignited at the exit of the exhaust chimney. The fire…

A leak occurred on the safety valve of a train wagon transporting liquid hydrogen wagon. The train was composed of 10 wagons. The train was stopped on the railway several hours to allow…

Near the end of the process of filling a gaseous hydrogen tube trailer at a liquid hydrogen transfilling station, a safety pressure-relief device (PRD) rupture disc on one of the tube trailers ten…

The incident occurred in a plant producing organic chemistry products. Hydrogen leaked briefly from an hydraulic valve. There has been no victim.

A hydrogen leak alarm was received in the control room from the reformer of the hydrogen plant of a chemicals manufacturing facility. The reformed was depressurised and the leak stopped. The leak was…

An aerosol of hydrogen, hydrogen chloride and sulfuric acid is released in a plant producing chlorine via electrolysis.The exhaust pipe on the water circuit of the electrolyzer was blinded due to the…

A hydrogen release occurred in a storage area of a nuclear power plant.. The storage consisted of three trailers made of 14 compressed gas cylinders each. The cylinders, mounted horizontally, had a…

During the start-up operation (phase) of a cryogenic unit, a separator exploded, releasing ethane, ethylene, methane and hydrogen. The bursting of a tank was caused by a 1600 mm long incipient crack…

A leak of a flammable mixture of hydrocarbons and hydrogen from a ruptured pipeline caused an explosion and fire, killing one person and injuring forty six. Investigations into the incident found…

A high pressure reactor ruptured during a catalyst activation operation. A gaseous stream of hydrogen and light hydrocarbons was released and spontaneously ignited. The unit was immediately…

In an ammonia production unit, a 350-bar leakage of synthesis gas (ammonia + hydrogen) occurred in the compressor room. The leak was the result of the failure of a weld on a line (2") at the outlet…