Event
- Event ID
- 63
- Quality
- Description
A liquid hydrogen tanker was returning almost empty to the base terminal. The drivers noted a pressure rise in the tanker stopped at a remote area of a rest area and performed a controlled venting.
It was determined they had not properly stabilised the tank internal pressure before leaving the customer site. The vehicle was thoroughly inspected prior to its next dispatch.- Event Initiating system
- Classification of the physical effects
- Unignited Hydrogen Release
- Nature of the consequences
- leak no ignition
- Macro-region
- North America
- Country
- United States
- Date
- Component involved
- LH2 tank (road tanker)
- Failure mode
- manual venting
- Initiating cause
- over-pressurisation (wrong operation)
- Root CAUSE analysis
INITIAL CAUSE was over-pressurisation of the tank during the journey.
The ROOT CAUSE was the failing to successfully perform stabilisation of the tank after delivery.- Root causes
- Date entry in HIAD
- 31/12/2024
Facility
- Application
- Hydrogen transport and distribution
- Sub-application
- LH2 tanker
- Hydrogen supply chain stage
- All components affected
over-pressure
- Process temperature range [C]
- cryogenic temperature (below -50°C)
- Process pressure range [MPa]
- low to medium pressure (below 2 MPa)
- Location type
- Open
- Location
- highway or similar
- Operational condition
- Pre-event occurrences
The tank stabilisation procedure had not been performed properly after the transfer of the liquid hydrogen.
Emergency & Consequences
- Number of fatalities
- 0
- Number of injured persons
- 0
- Currency
- US$
- Property loss (onsite)
- 300
- Post-event summary
No loss is reported
- Emergency action
The drivers performed a stabilisation procedure on the highway.
In-depth data
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Released amount (kg)
- 0.67
- Probable IGNITION SOURCE
References
- Sources categories
- PHMSA
- Reference & weblink
Event incident ID I-1990080589 of the PHMSA database (Pipeline and Hazardous Materials Safety Administration, 1996),
https://portal.phmsa.dot.gov/analytics/saw.dll?Portalpages
(accessed September 2024)
