HIAD Facility - Application: Hydrodesulfurization Process
A hydrogen leak occurred on the hydrogen line of a hydro-desulfurization unit, followed by ignition . The failure was located on a supply manifold of the unit at a support beam. The unit was shut…
The fire occurred in the hydrogen treatement unit of hydrodesulfurisation plant.
The fire occurred on a flange of a hydrogen supply line to a desulfurization reactor unit of diesel, which leaked and ignited (30 cm flame) The leak was stopped by isolating the part of line…
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.…
Hydrogen leaked from the hydrogen compressor and ignited. The compressor was part of the desulfurization unit of a refinery. It had just been delivered and was under commissioning testing. The fire…
While making preparation for operation of a compressor supplying hydrogen to a heavy oil desulfurization unit, an operator got injured as the checking cover of a crank room came off, emitting a hot…
In a hydrodesulfurization unit of a refinery, a leak on a hydrogen line ignited and damaged the surrounding lines, including one with acid gas. The weather conditions (fog and very little wind)…
The event occurred in a desulfurisation unit for heavy oil (hydro-cracking, Isomax process). The hydrogen release took place from one of the heat exchanges, after the restart of the unit. The reason…
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.…
The charge pump on a hydro-desulfuriser unit tripped. The charge flow control valve then opened wide on low flow. The high pressure hydrogen supply to the unit flowed backwards through a faulty non…
A leak and fire occurred in a hydrogen compression section of a hydrocracker.
The vessel affected by the incident was a gas storage used for the desulfurisation process. The desulfurization gas had high hydrogen content. The vessels had cracks in the upper transverse fillet…
A vertical cylindrical fired heater was used on the charge to a hydrodesulfurisation reactor. The flow was two phase at the heater inlet (hydrogen and hydrocarbon). The distribution of flow to the…
The event occurred at the flanges on the outlet of a desulfurization reactor, which was working under about 300 degrees C The flanges and bolts were cooled down by a large amount of rainwater which…
A leak occurred on a line connecting the hot separator to the cold separator of a refinery diesel desulfurization. The alert was given by the activation of the fixed H2S detector. The 30 bar pressure…
A sudden failure occurs on a hydrogen line of a refinery desulfurization unit. The equipment is located between a hydrogen compressor and its overpressure protection valve. It is isolated…
The accident occurred on one of the heat exchangers of the hydro-desulfurisation unit. The role of the exchanger , located between the charge pumps and the furnace, is to heat the charge using the…
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…
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…
The operator detected a leak of aerosol hydrocarbons (diesel, hydrogen and hydrogen sulfide) in the diesel desulfurisation unit, causing a release of hydrogen and hydrogen sulfide at the top of the…