HIAD Causes: System Design Error

While de-plugging a cooling circuit, a blockage suddenly released, causing a heavy movement of a flexible hose connected to the system. The flexible hose hit several small pipes and one employee…

The event affected the hydrocracker unit. A sudden release into a cracker compressor flare header destroyed a safety relief valve and damaged a sight glass on a liquid collection pot. As a…

A leak occurred on a line connecting the hot separator to the cold separator of a refinery diesel desulfurization. The alert was given by the activation of the fixed H2S detector. The 30 bar pressure…

A sudden failure occurs on a hydrogen line of a refinery desulfurization unit. The equipment is located between a hydrogen compressor and its overpressure protection valve. It is isolated…

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 accidental hydrogen release occurred when testing the storage system connected to a PEM electrolyzer. The leak test consisted in filling the storage with hydrogen at step-wise increase of…

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…

Although the ARIA report (see references) does not mention it, the unit affected was very probably the oil desulfurisation unit. The release occurred following the rupture of a pipe of 250 mm in…

On February, 20, 1987, the Vogtle nuclear power plant reported a hydrogen leak inside the auxiliary building. This plant was recently licensed, had never been critical, and was in cold shutdown at…

The incident occurred in the hydrogenation reactor and products cooling unit. The reactor operated under vacuum conditions and the cooling medium was water.Toxic, flammable and explosive substances (…

This accident happened on the SS66 road and involved a trailer transporting compressed hydrogen cylinders. The 50 l cylinders were in packages of 16 cylinders each. Due to the breaking of fixing…

A short circuit developed in the wiring of a fire eye system on one of two 600 psig boilers serving a refinery. This triggered a rapid sequence of events that resulted in a one week shutdown of much…

The event occurred just after that start-up steam was introduced into the reformer furnace inlet. At this moment an very high pressure and a single loud bang was reported by the operations personnel…

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…

There was a small leak of syngas (a mixture mainly consisting of hydrogen and carbon monoxide) resulting in a localized fire at a bolted flange joint on the outlet carbon steel pipework of the High…

The event occurred while re-starting the ammonia production unit after a technical stop, a synthesis gas (50% hydrogen, 17% ammonia, methane and nitrogen) leak ignited on a flange located just after…

A 24" pipe carrying synthesis gas (Hydrogen = 43.5%, Nitrogen = 14.08%, Methane = 0.2%, Carbon Dioxide = 12.3%, Water = 29.3% by volume) ruptured. About 60 kg of hydrogen contained in the gas…

Fire caused by leakage from tank. Gaseous hydrogen release in generator caused by turbine vibrations

A vertical cylindrical hydrodesulfurisation reactor charge heater was being started up with hydrogen flow only rather than hydrogen plus oil as in normal operation. As a result of the low heat load…