Event
- Event ID
- 482
- Quality
- Description
When travelling to a customer, a liquid hydrogen tanker experienced a slight tank pressure increase due to an improper cooling down. The driver was carefully monitoring the pressure and when he observed the pressure rise about the normal level, he called the central logistics contact and reported the situation. The driver was advised to manually operate a hydrogen vent to re-stabilise the internal pressure. After having succeeded in doing so, the driver could restart without no further pressure problem during the trip (approximately 7 hr).
- 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
The INITIAL CAUSE was over-pressurisation of the LH2 tank, which caused an intervention of the drivers to reduce pressure.
The ROOT CAUSE is reported as an inadequate cooling down procedure before filling.- Root causes
- Date entry in HIAD
- 01/01/2025
Facility
- Application
- Hydrogen transport and distribution
- Sub-application
- LH2 tanker
- Hydrogen supply chain stage
- All components affected
vacuum thermal insulation
- 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 LH2 tanker was full
Emergency & Consequences
- Number of fatalities
- 0
- Number of injured persons
- 0
- Currency
- US$
- Property loss (onsite)
- 200
- Post-event summary
1.3 kg hydrogen were released.
- Emergency action
The driver was carefully monitoring the pressure and when he observed the pressure rise about the normal level, he called the central logistics contact and reported the situation, was advised to manually operate a hydrogen vent to re-stabilise the internal pressure. After having succeeded in doing so, the driver could restart without no further pressure problem during the trip
In-depth data
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Released amount (kg)
- 1.3
- Probable IGNITION SOURCE
References
- Sources categories
- PHMSA
- Reference & weblink
Incident I-1996110732 of the US Pipeline and Hazardous Materials Safety Administration PHMSA:
https://portal.phmsa.dot.gov/analytics/saw.dll?Portalpages&PortalPath=%…
(accessed September 2024)
