Event
- Event ID
- 933
- Quality
- Description
- During maintenance work on a gas pipeline carrying hydrogen , a worker hears a leak at a bridge. The operator measures an concentration of 3% of the low flammability limit at few centimetres from the leak, and no detection beyond 25 cm. The area was highly ventilated. The technicians secured the area, isolated the section five hours later and started the controlled gas release. after two additional hours the pressure had reduced to zero and they started the nitrogen inerting. The pipe was repaired the next day.
- Event Initiating system
- Classification of the physical effects
- Unignited Hydrogen Release
- Nature of the consequences
- Leak No Ignition (No additional details provided)
- Macro-region
- Europe
- Country
- France
- Date
- Main component involved?
- Pipeline
- How was it involved?
- Leak & Formation Of A Flammable H2-Air Mixture
- Initiating cause
- Unknown
- Root causes
- Unknown (No additional details provided)
Facility
- Application
- Hydrogen Transport And Distribution
- Sub-application
- Pipeline
- Hydrogen supply chain stage
- Hydrogen Transport (No additional details provided)
- All components affected
- hydrogen pipeline, 80 mm diameter, 75 bar pressure
- Location type
- Open
- Location description
- Countriside Or Desert
- Operational condition
- Pre-event occurrences
- The begin of the leak was unknown. The leak was detected during maintenance work, what does not mean that it started at that moment.
The pipeline section (diamater DN80) dated back to 1988.
Emergency & Consequences
- Number of injured persons
- 0
- Number of fatalities
- 0
Event Nature
- Release type
- gas
- Involved substances (% vol)
- H2 100%
- Actual pressure (MPa)
- 7.5
- Design pressure (MPa)
- 7.5
- Presumed ignition source
- No ignition
References
- Reference & weblink
Event description in the French database ARIA<br />
https://www.aria.developpement-durable.gouv.fr/accident/43705/<br />
(accessed September 2020)<br />
JRC assessment
- Sources categories
- ARIA
