HIAD Causes: Job Factors

A weld on a 1 inch diameter instrument tapping from a Octafiner reactor overhead line fractured, resulting in a small but intense fire, lasting about 50 minutes until the unit was nitrogen purged.The…

A pipe failed, probably due to material failure, and the plant was automatically put in hot stand-by (feed and energy supply automatically cut out). The plant was gradually cooled down. After about…

Around 4 a.m., a major leak occurred at the outlet of the diesel hydrodesulfurization furnace in a refinery. The goal of this unit is to lower the sulfur content of diesel fuels produced in other…

Overpressure caused a cylinder head of a gas compressor to fail causing release of hydrogen followed by a fire during the start-up of the compressor after maintenance.

In a plastics production plant, a pallet containing 7 cylinders of nitrogen and 1 cylinder of hydrogen fell from a truck traveling in a logistics zone. The driver stopped the vehicle, cut off the…

An explosion and fire occurred at a reciprocating recycle hydrogen compressor during commissioning of a new Diesel hydrotreatement Unit. It happened during the reactor pre-sulphidisation step, when…

[NOTE: the sources are not completely clear in describing the system involved in this incident ; the following is the most plausible option according to HIAD validator]The explosion happened in two…

Release from pressure bottle followed by ignition and perhaps fast deflagration. Nine people affected, including the operator of the bottle.

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 explosion occurred while maintenance personnel were grinding a high-pressure injection (HPI) pipe, which had been recently cut at approximately 18 inches from the nozzle connecting the HPI pipe…

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 fire occurred after a hydrogen released from a venting valve opened for inspection. The hydrogen was at 300 bar and 300C centigrade. The hydrogen ignited probably spontaneously and killed 4…

Three workers were working in the sulfur recovery unit (SRU), trying to restore the hydrogen flow. The workers were trying to isolate the cause of a flow problem: hydrogen was entering the…

The fire occurred in the hydrogen treatement unit of hydrodesulfurisation plant.

Ignition of hydrogen produced by washing slag in a tank for chlorosulfonic acid.

Dyestuffs intermediates plant. Hydrogen escaped from leak in pipeline connection to cylinder. Householders nearby evacuated for a short while.

Hydrogen release and explosion due to a leak in a high pressure hydrogen storage tank, during first start-up of plant.

A violent explosion occurred in a refinery's crude oil hydrodesulfurization unit. The unit's alarm is immediately triggered in the control room, the operator activates the internal emergency plan.…

Alarm received by firefighters around midnight by a resident who heard abnormal noise under the Beaumont Bridge while walking his dog.Perimeter of security set up very quickly with isolation of the…