Event
- Event ID
- 593
- Quality
- Description
- This incident occurred on a hydrogen production device during the Great Hanshin Earthquake (Hyogo Prefecture Southern Earthquake). Hydrogen gas leaked from a pipe thread joint in a valve station. The leak was stopped by tightening the joint.
- Event Initiating system
- Classification of the physical effects
- Unignited Hydrogen Release
- Nature of the consequences
- Leak No Ignition (No additional details provided)
- Macro-region
- Asia
- Country
- Japan
- Date
- Main component involved?
- Joint/Connection (Threaded)
- How was it involved?
- Leak & Formation Of A Flammable H2-Air Mixture
- Initiating cause
- Loss Of Tightness (Mechanical Vibrations)
- Root causes
- Root CAUSE analysis
- The INITIATING cause was the leak from a joint which became loose. The ROOT CAUSE was an earthquake.
Facility
- Application
- Hydrogen Production
- Sub-application
- unspecified
- Hydrogen supply chain stage
- All components affected
- threated joint, pipe
- Location type
- Unknown
- Operational condition
- Pre-event occurrences
- Earthquake
Emergency & Consequences
- Number of injured persons
- 0
- Number of fatalities
- 0
Event Nature
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Presumed ignition source
- No ignition
References
- Reference & weblink
High Pressure Gas Accident Cases Database of the KHK (High Pressure Gas Safety Association): <br />
https://www.khk.or.jp/public_information/incident_investigation/hpg_inc… />
(accessed May 2025)The first entry in HIAD was coming from RISCAD, which is now closed.<br />
JRC assessment
- Sources categories
- KHK
