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Clean Hydrogen Partnership

A road incident involving a CGH2 cylinders trailer

Event

Event ID
1185
Quality
Description
A truck carrying hydrogen cylinders on a village road had to execute an emergency manoeuvre to avoid an oncoming vehicle which had crossed the centre line. The truck hit the curb and overturned. The cylinders were scattered on the road, one of them lost its protection due to the impact with the ground damaging the valve. Hydrogen leaked and ignited.
Event Initiating system
Classification of the physical effects
Hydrogen Release and Ignition
Nature of the consequences
Fire (No additional details provided)
Macro-region
Asia
Country
Japan
Date
Main component involved?
Valve (Generic)
How was it involved?
Rupture
Initiating cause
Impact, Rollover, Crash
Root causes
Root CAUSE analysis
INITIATING CAUSE was a traffic accident.
In absence of information on driver, the ROOT CAUSE is attributed generically to a human error (wrong manoeuvre).

Facility

Application
Hydrogen Transport And Distribution
Sub-application
CGH2 cylinders truck
Hydrogen supply chain stage
Hydrogen Transport (No additional details provided)
All components affected
valve, cylinders cap.
Location type
Open
Operational condition

Emergency & Consequences

Number of injured persons
0
Number of fatalities
1

Event Nature

Release type
gas
Involved substances (% vol)
H2 100%
Presumed ignition source
Not reported

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)

JRC assessment