Event
- Event ID
- 614
- Quality
- Description
- An explosion occurred in a hydrocracking reactor fitted with TOC which is a automatic cut-off system for raw oil and hydrogen supply. On the day of the incident, the operation was stopped with TOC being triggered, but the cause was not identified. Hydrogen circulation was restarted, and some 5 hours later, the loud explosion took place around a low pressure separator, rupturing the reactor and throwing debris in all directions. The contents were released to form a vapour cloud which ignited followed by a fire ball.
- Event Initiating system
- Classification of the physical effects
- Hydrogen Release and Ignition
- Nature of the consequences
- Macro-region
- Asia
- Country
- Japan
- Date
- Root causes
- Unknown (No additional details provided)
Facility
- Application
- Petrochemical Industry
- Sub-application
- Hydrocracking process
- Hydrogen supply chain stage
- All components affected
- oil and raw supply, low pressure separator, reactor
- Location type
- Unknown
- Location description
- Industrial Area
- Operational condition
- Pre-event occurrences
- The pre-event related to the hydrogen-event was an automatic stop of the unit, before the hydrogen was recirculated.
- Description of the facility/unit/process/substances
- A TOC is an automatic cut-off system for the supply of raw oil (feedstock) and hydrogen. It is designed to stop the flow of highly flammable materials into the hydrocracking reactor in an emergency, such as a fire or explosion, to prevent the incident from escalating.
Emergency & Consequences
- Number of injured persons
- 1
- Number of fatalities
- 0
Event Nature
- Release type
- gas mixture
- Involved substances (% vol)
- unknown
- Presumed ignition source
- Not reported
References
- Reference & weblink
Orignal source lost. RISCAD is closed.
JRC assessment
- Sources categories
- RISCAD
