Event
- Event ID
- 705
- Quality
- Description
- A fuel cell and hydrogen vehicle terminated the refueling, but the dispenser nozzle could not be completely disconnected from the the vehicle receptacle. It could be disconnected only after several attempts. The cover of the nozzle interfered with the disconnection operation. It was not a problem of malfunction of the nozzle. It could be easily disconnected when withdrawn along its axis. However, because if its weight, a misalignment could take place which made difficult the desconnection.
[H2TOOLS] - Event Initiating system
- Classification of the physical effects
- No Hydrogen Release
- Nature of the consequences
- Macro-region
- North America
- Country
- United States
- Date
- Main component involved?
- Dispenser (Nozzle)
- How was it involved?
- Malfunctioning
- Initiating cause
- Wrong Operation
- Root causes
- Root CAUSE analysis
- It is plausible to assume the first prototype design of the hose and nozzle assembly were very heavy and of difficult handling.
Facility
- Application
- Road Vehicles
- Sub-application
- FCEV (LDV)
- Hydrogen supply chain stage
- Hydrogen Transfer (No additional details provided)
- All components affected
- nozzle, receptacle
- Location type
- Open
- Location description
- Unknown
- Operational condition
Emergency & Consequences
- Number of injured persons
- 0
- Number of fatalities
- 0
Lesson Learnt
- Corrective Measures
- H2TOOLS reported the following actions:
Manuals showing the correct connecting and disconnecting procedures were established for each fueling dispenser.
Separate manuals were needed since the shape of the grip differs from dispenser to dispenser.
Event Nature
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Presumed ignition source
- No release
References
- Reference & weblink
Events in database H2TOOLS<br />
https://h2tools.org/lessons/hydrogen-fueling-dispenser-nozzle-detached<… />
(accessed December 2025)
JRC assessment
- Sources categories
- H2TOOLS
