Hydrogen leak due to a fault with non-process related battery equipment.After reporting the hydrogen leak, fire crews have been called to a gas terminal. The leak was due to a fault with non-process related battery equipment.

The tanker truck was carrying nearly 13,000 gallons of liquid hydrogen. it hit the base of a light pole in the parking lot of a local grocery store as the driver was attempting to turn around. Hydrogen gas then began leaking out of it. This resulted in a valve on the truck to become damaged and could have caused the liquid hydrogen to be released from the truck, a very serious situation for nearby residents and businesses. Nobody was physically harmed by the incident.

The truck overturned and lost vacuum insulation. The hydrogen boiled and vented, but there was no ignition. The potential for fire or explosion, however, led to precautions that did cause considerable disruption: the interstate highway where the accident occurred was closed and nearby homes and businesses were evacuated.

the commercial vehicle was traveling when the two-person crew noticed what appeared to be smoke emitting from the tanker trailer. The crew called 911 and safely pulled to the side of the road Fire brigade, law enforcement and Department of Transportation personnel then escorted the vehicle to a safe location near a University main campus. The hazard response team entered in contact with the transportation company and left the tanker depressurizing and off-gassing till it was safe for it to further travel.

The hydrogen leak occurred on a lorry travelling on a motorway. According to Highways England the vehicle was carrying nine cylinders of gas, one of which had a crack and was leaking. The only way to allow it to safely disperse was to let it vent.An exclusion zone was set up around it and the road closed. The incident led to delays of up to 90 minutes during rush hour.

The leak occurred at the hydro-isomerisation unit of a refinery. Following the observation of a pressure drop between two heat exchangers, controls were carried out on site. A noise was heard, but no gas detection was activated on the unit. A hydrogen leak was detected but the source was not identified. Following the detection of hydrogen, the access to the unit was forbidden and emergency services and the fire department alerted. The unit was decompressed using the safety flare. When the pressure was sufficiently reduced, two operators looked for the origin of the leak.

In a fertilizer manufacturing plant, a gas leak occurred at an ammonia unit heat exchanger located in a ventilated area outside. The operator partially stopped the unit, set up steam hoses and monitored the situation by taking measurements outside in the field. At this stage of the process, the gas is composed of hydrogen, water vapour, methane and nitrogen.The unit restarted the next day.

The event occurred in a bus garage when carrying out the purging process of the hydrogen cylinders. This process was executed via an electronic control system, but it was found that one cylinder solenoid valve was mechanically stuck. In these cases, the valve manufacturer has foreseen an alternative manual process using an override tool. The process was executed according to manufacturers instruction, but the valve did not start to evacuate hydrogen when expected. The fuel cell engineer tried to rectify the problem and started removing the override tool, but forgot to unwind the stem.

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 diameter. 350 kg were released to the atmosphere in 11 minutes, consisting in 80% of hydrogen, 5% of hydrogen sulfide (H2S) and 4% of water and hydrocarbons. The mixture was both toxic and flammable. H2S detector and explosimeters alarms were triggered and the operating staff cut off the supply. The cloud dispersed but the area of irreversible effects for H2S has remained within the site.

The leak occurred on the inlet pipe (P=21 bar, T=320C) of the diesel desulfurization reactor of a refinery. Hydrogen and diesel fuel were released in the gas phase. The hydrocarbons contaminates neighbouring fields, local residents are informed.