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HIAD Event Initiating System: Non-Hydrogen System Initiating Event


In a petrochemical plant, a gas mixture at 270 bar made of 75% hydrogen (H2) and 25% methane (CH4) leaked through the bottom valve of a dryer of a resin production unit. After detection of the leak,…
Hydrogen bus hit by a private car, which was driving out from a parking place. Bus damaged on the rear, right side.
Hydrogen bus hit by a car during the turn to the left; bus left side damaged.
hydrogen bus hit by a car. Damage on the bus right side.
Hydrogen bus hit by private car in the roundabout at the main station; damage on the right side
An explosion occurred in hydrogen compressor, due to rupture of 4 inch suction pipeline to the compressor. "Hydrogen...exploded and continued to burn until it was extinguished".3 fatalities.
A huge car crash take place on the highway A4/E70 between Padua and Trieste, North of Italy. More than 250 cars were involved. More than 13 persons died and more than 90 injured. The main reason of…
Maintenance works were ongoing after an outage at a turbine and generator unit of the plant. Fifteen maintenance mechanics were working at that time on the unit. An access cover was removed causing…
An explosion at a linear alkylbenzene (LAB) plant caused substantial damage to the facility and injured five workers. Production remains down, and the company has sent a letter to customers declaring…
An over-dosage of natron lye in a silicon dust suspension container raised the ph-value up to 11, producing large amounts of hydrogen in a short time. The hydrogen caused an extreme pressure increase…
The event occurred in the continuous casting of hot metallic melt of the plant.Cooling water leaked through a crack in the cooling water inlet pipe of a secondary cooling line and directly into the…
The event took place at the metal sheet pre-heating oven. This oven uses a mixture of hydrogen and nitrogen to form a reducing atmosphere. The zinc crucibles draining operations was completed and…
The explosion occurred when a spark from welding equipment ignited flammable vapours from a 415,000-gallon (ca. 1.5 million of litres) sulfuric acid storage tank at the refinery.The investigation…
The incident occurred in the building containing the residues of production. The alarm was given by an employee who heard detonations coming from the building. A few seconds later, the building's…
In a chemical plant (SEVESO), corrosion on the water side of a cooling exchanger caused water to enter the sulfuric acid and attack the steel in the tank. This reaction produced hydrogen that…
Failure of a strainer allowed sand from brine filters to get into mercury cells in a chlorine plant. It appears that the sand obstructed flow and caused excessive hydrogen generation. An explosion…
The sodium chlorate production unit had restarted after a maintenance shutdown phase. The mercury cells had been under nitrogen flushing since the beginning of the shutdown to avoid the presence of…
The fire broke out in the acid etching tank of the ferric chloride manufacturing unit of a SEVESO-classified chemical plant. In this tank, the attack reaction of the iron metal with hydrochloric acid…
A hot oil line (8-inch) in the hydro-desulfurisation (HDS) unit failed due to fatigue cracking. Hot oil at 50 bar and 343C sprayed across the roadway into the hydrogen units where ignition occurred.…
[NOTE: the attribution to hydrogen formation as cause of the explosion is 'probable 'but not fully demonstrated].Two explosions in two different sprinkler systems occurred, wit the same assumed cause…
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