Event
- Event ID
- 816
- Quality
- Description
In a chemical plant , a process gas leak (4% ammonia and 88% hydrogen) occurs during a purge operation. The cloud of gas ignites and explodes. An employee is killed.
- Event Initiating system
- Classification of the physical effects
- Hydrogen Release and Ignition
- Nature of the consequences
- Macro-region
- Asia
- Country
- Japan
- Date
- Component involved
- pipe (generic)
- Failure mode
- rupture & ignition
- Initiating cause
- inadequate or no purge
- Root CAUSE analysis
The INITIATING CAUSE is the leak and ignition of a 4% ammonia - 88% hydrogen mixture
The ROOT CAUSE is unknown.- Root causes
- Unknown
- Date entry in HIAD
- 01/01/2020
Facility
- Application
- Chemical industry
- Sub-application
- Ammonia production
- Hydrogen supply chain stage
- All components affected
proces gas line
- Location type
- Open
- Location
- industrial area
- Operational condition
- Pre-event occurrences
The accident occurred during a purge operation.
Emergency & Consequences
- Number of fatalities
- 1
- Number of injured persons
- 0
- Post-event summary
An employee is killed.
In-depth data
- Release type
- gas mixture
- Involved substances (% vol)
H2 88%
NH3 4%- Probable IGNITION SOURCE
- Explosion type
References
- Sources categories
- ARIA
- Reference & weblink
ARIA data base
https://www.aria.developpement-durable.gouv.fr/accident/5356/
(accessed December 2025)
