HIAD Nature Event - Release Type: Gas

hydrogen gas released from vent stack following failure of relief valve in pressure relief system on bulk hydrogen installation, no ignition and no injuries.

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…

During maintenance work on a gas pipeline carrying hydrogen , a worker hears a leak at about at a bridge. The operator measures an concentration of 3% of the low flammability limit at few…

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…

Compressed hydrogen was released from a storage system due to the rupture of a Bourdon-type pressure gauge.

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…

A leak of 700 l of gaseous hydrogen was detected around on a connection of a rack of cylinders on a trailer truck, in aircraft plant (classified Seveso, lower tier).

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…

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 tractor-trailer carrying canisters of gaseous hydrogen gas crashed on a major East Coast route. Compressed hydrogen gas leaked from some of the containers after the truck rolled on its side.

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…

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…

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…

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 hydrogen safety sensor went into alarm at a hydrogen demonstration facility. The early morning temperature was near freezing and there was a trace of precipitation on exposed surfaces. Upon further…

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…

A leak occurred at a of a liquid withdrawal valve of a liquid hydrogen storage tank. The hydrogen escaped at the flange between the valve body and the upper part of the valve (flange with tongue and…