While filling a 9 litre gas cylinder with pressurised hydrogen in the hydrogen storage area, a blast occurred which destroyed the low pressure gauge, followed by a jet fire which damaged the surface of the cylinder.The cylinder to be filled, including pressure gauge and control system, had been provided by a third party. Its nominal pressure was 35 MPa, however the maximal pressure of this filling would have been much lower, less than 20 MPa, corresponding to the maximal pressure of the bulk storage available.

A cryogenic hydrogen laboratory had a power outage. The cryogenic hydrogen storage was no longer being cooled, therefore temperatures and pressures within the storage system started rising. There were several relief devices on the system, one with a set point of 150 psi (approximately 1 MPa) and a second at a set point of 165 psi (1.1 MPa). The system was monitored by site personnel so that when the hydrogen pressure increased to 120 psi (approximately 0.5 MPa), a manual vent was opened. However, the manual vent rate was not able to control the rising pressure.

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 inspection following the sensor alarm, a 3,500 psig (approximately 24 MPa) stationary storage vent was found to be releasing hydrogen through the PRD vent stack (PRD = Pressure Relief Device). The alarming sensor was at an adjacent building but responded to hydrogen 20 yards (18 m) downwind from the vent location. The vent release location is 10 feet (3 m) above ground level.

A researcher was conducting an experiment that involved sawdust being heated at pressure using hydrogen gas in an laboratory-scale autoclave.The gas leaked from the autoclave during the experiment and ignited, causing injuries to the scientist (cuts, bruises and facial burns).The explosion caused extensive damage to the building, propelling debris more than 20 metres into a garden area.

The safety cabinet with compressed hydrogen was located in a laboratory and used to supply hydrogen to an experimental facility. The safety cabinet was equipped with exhaust extraction. Due to a leak, technical assistance had been requested from the fire department. The head of laboratory shut off the electrical supply to the laboratory. Measurements showed that there was no potentially explosive atmosphere in the laboratory room.

A 50-litre standard hydrogen gas cylinder was temporarily placed and used in a laboratory. The hydrogen gas was used for a flame ionization detector (FID) in gas chromatography (GC) instrument. The safety relief valve on the pressure regulator blew open and released of about 340 g of hydrogen into a laboratory. The gas cloud did not ignite so there was no injury or damage. In Henriksen et al (see references) a full investigation is presented to verify the cause of leakage and estimate the gas concentration of the dispersion and gas cloud, including the modelling of a likely explosion.

The event occurred in a university research building dedicated to the study of the take-off of space launchers . An operator gave the alarm during the hydrogen pressure pre-setting phase. he had seen on the video surveillance screen a flame at a pressure regulator on the line located on the walkway above the test hall.

A triangle flask exploded during a science-class experiment where diluted hydrochloric acid was made to react with zinc to generate hydrogen, at a junior high school. Injures were caused by glass debris flown, five very lightly injured pupils were sent to hospital. Probably hydrogen entered in contact with oxygen because of a wrong experiment procedure, resulting in ignition and explosion.

A chemical mobile intervention unit intervened in the faculty to neutralize in an envelope sealed an experimental device likely to release hydrogen. The faculty was evacuated during the intervention.

In a laboratory, tests with hydrogen as aerospace rocket propellants were carried out. One of the experiments consisted in the generation of a vertical jet (turbulent regime) to determine the sound levels emitted by jets of H2 gas. The flow was increased up to 55 kg / s. After 23 s, while decreasing the flow, the hydrogen ignited. A fireball was formed followed immediately by an explosion. The Vapour Cloud explosion VCE (mainly negative overpressure) caused damage to structures of the surrounding buildings (walls, doors, roofs).