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 specialist company (third-party company), had replaced the cylinder head of pump, but during assembly they did not re-isntalled the prescribed temperature sleeve for the thermometer (the temperature sleeve is the pressure-bearing element).

DISCLAIMER: this event description is unsatisfactory. Details on the system and the real incident evolution are (still) missing. The incident affected a prototype light hydrogen vehicle in a hydrogen research centre of a university. The vehicle was a kind of a four-wheeled scooter. The fire started on the vehicle while being filled. Apparently, the hydrogen storage system was a hydrogen hydride. The site was evacuated and the building isolated from its hydrogen supply. The firefighters attacked the fire with a hose and extinguished it one hour later.

The incident occurred at company producing specialised products for aerospace and aeropwer applications. An employee was operating an induction brazing machine under hydrogen atmosphere when an explosion occurred.

Release from a welding of a hydrogen transmission pipeline At 12:45 pm the operation control centre (OCC) recognised that a customer flow and pressure dropped significantly. At 13:28 the OCC made the decision to close the upstream remote operated valve. At 15:00 the pipeline technician arrived on site and confirmed the breach in the pipeline. Additional pipeline operations technicians were deployed to isolate both manual block valve upstream and downstream of the incident site.

A hydrogen release and subsequent fire occurred at meter station of a pipeline transporting hydrogen to a refinery. Local refinery emergency response team responded and secured the area. The pipeline was isolated, and the fire extinguished itself. During a winter storm, the area was experiencing abnormal freezing conditions and widespread power outages were occurring. As a result, third party hydrogen supply to the refinery was reduced. These upsets resulted in the need to export larger than normal flow rates on the hydrogen pipeline.

The vehicle was being driven in traffic at low speed when it was struck from behind by a full-size pickup which forced the fuel-cell vehicle forward into another pickup. No hydrogen was released and no one was injured.The vehicle was extensively damaged on both front and rear ends and later declared a total loss. A vehicle data analysis indicates that the vehicle and controls operated as designed.

This incident occurred at the hydrogen production and storage unit of (probably) a power plant using hydrogen as a coolant of the turbine-generator system. Hydrogen was produced probably by water electrolysis (the source does not say it) and stored in 6 steel tanks. One of the six hydrogen storage tanks exploded killing a staff member. The investigation determined that a mixing of hydrogen and oxygen occurred in the tank. The needle valve of the hydrogen and oxygen pressure regulator as jammed, and the oxygen leaked into the hydrogen main supply line and entered the hydrogen tank.

a gas leakage (approximately 70% hydrogen, 21% nitrogen and the rest carbon monoxide and other impurities) occurred at the connection between a temperature measurement casing and a flange in the carbonization workshop cleaning tower. The leakage was reported to the plant leader, who issued the request to the workers to use iron cards and rubber plates to plug the leak. The operation failed and the leakage continued. At 17:00, at the request of the plant leader, the workers used a tire inner tube to wrap the leak.

A gas release occurred in the building for the recirculation of processes gas. The gas was a mixture of hydrogen and nitrogen. It occurred at the outlet valve, during works aiming to replace it. This caused the creation of an explosive gas mixture and the surrounding spaces. The defective valve has been identified several years before, its poor design and ageing caused the gas leakage. The ignition took place with 9 minutes delay after initial leakage.

The 10 m3 hydrogen storage tank at the hydrogen station belonging to the oxygen plant exploded during production operation. The hydrogen storage tank was installed and used by the plant in 1995, with a design pressure of 1,5 MPa, a volume of 10 m^3, a minimum wall thickness of 12 mm, a total length of 4576 mm (height) and an inner diameter of 1800 mm. After the explosion, there were no metal components left, except for the cement prefabricated foundation of the tank base.