Event
- Event ID
- 630
- Quality
- Description
At a rocket engine testing facility, a combustion experiment of the pre-burner (gas generator for driving the turbopump) was being conducted, before testing the turbopump. The pre-burner is the gas generator for driving the turbine.
In the course of the experiment, hydrogen gas leaked from the flange of the supply pipe connecting the high-pressure hydrogen storage and supply facility and the pre- burner and was ignited by the igniting element of the pre-burner.- Event Initiating system
- Classification of the physical effects
- Hydrogen Release and Ignition
- Nature of the consequences
- fire
- Macro-region
- Asia
- Country
- Japan
- Date
- Component involved
- flange (bolts)
- Failure mode
- leak & ignition
- Initiating cause
- manufacturing defect/error
- Root CAUSE analysis
The INITIATING CAUSE was the failure of a flange due to a defective bolt.
The post-incident investigation of the bolt of the flange, suggested a manufacturing defect as the cause of failure.- Root causes
- Date entry in HIAD
- 01/05/2025
Facility
- Application
- Non-road vehicles
- Sub-application
- Aerospace
- Hydrogen supply chain stage
- All components affected
bolt, flange
- Location type
- Unknown
- Location
- industrial area
- Operational condition
Emergency & Consequences
- Number of fatalities
- 0
- Number of injured persons
- 0
In-depth data
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Probable IGNITION SOURCE
References
- Sources categories
- KHK
- Reference & weblink
High Pressure Gas Accident Cases Database of the KHK (High Pressure Gas Safety Association):
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.
