HIAD Quality Indicator: 3

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…

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…

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…

The event occurred at the hydrogenation unit of a pharamceutical company. 145 kg of hydrogen were released the atmosphere at the gas circulation pump, due to a maintenance error . A…

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…

Minor leak in the break-away coupling for 35MPa dispenser of a refuelling station for buses.The leak developed in the break-away coupling during a controlled test refuel. The test was attended by…

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 hydrogen and fuel cells bus experienced a hydrogen detection alarm in a city centre. This triggered the evacuation of the immediate surroundings and the towing of the vehicle to the maintenance…

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…

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 hydrogen leak took place on a trailer carrying compressed hydrogen, located inside the fenced perimeter of a hydrogen station. According to the company managing the hydrogen delivery and refuelling…

The release occurred after the collision between a truck containing liquid hydrogen and a truck containing manganese dioxide on a highway.Due to the release, the traffic was interrupted for 4 hours…

A leak occurred on a rack containing 12 cylinders of hydrogen (50 l at 200 bar each) delivered by a lorry inside the fenced storage area of a bulb manufacturing plant. The plants safety manager…

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…

The release took place in a metal cold rolling workshop.The hydrogen leaked from a cylinder of 15 m3, which was part of a storage system of 250 m3.Half of the workshop and the surrounding roads were…

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…

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…

The operator detected a leak of aerosol hydrocarbons (diesel, hydrogen and hydrogen sulfide) in the diesel desulfurisation unit, causing a release of hydrogen and hydrogen sulfide at the top of the…

A hydrogen leak occurred on a flange located on a pipe coming from the hydrogen storage tank. The staff was confined and the Internal Operation Plan was launched.Helium was injected in the tank and…