Event
- Event ID
- 1121
- Quality
- Description
A LH2 trailer/truck were travelling on a highway when they noticed vapour coming from the trailer cabinet. They exited the highway, parked and opened the trailer cabinet. They found that a nut had vibrated loose on a packing valve. They tightened the bolt and the leak stopped.
- 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
- valve (generic)
- Failure mode
- rupture, no ignition
- Initiating cause
- loss of tightness (road vibrations)
- Root CAUSE analysis
The INITIAL CAUSE was a leak from a packing valve due to a loose nut.
The ROOT CAUSE is related to the vibration which had caused the component to become loose, and probably also to the improper fixing of the nut during installation.- Root causes
- Date entry in HIAD
- 09/09/2024
Facility
- Application
- Hydrogen transport and distribution
- Sub-application
- LH2 tanker
- Hydrogen supply chain stage
- All components affected
Bolts or Nuts
- 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
Emergency & Consequences
- Number of fatalities
- 0
- Number of injured persons
- 0
- Currency
- US$
- Property loss (onsite)
- 0
- Post-event summary
None
In-depth data
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Released amount (kg)
- 0.26816805450416
- Probable IGNITION SOURCE
References
- Sources categories
- PHMSA
- Reference & weblink
Incident E-2008070338 of the US Pipeline and Hazardous Materials Safety Administration PHMSA:
https://portal.phmsa.dot.gov/analytics/saw.dll?Portalpages&PortalPath=%…
(accessed September 2024)
