Safety Flash
Trapped pressure release incident
Trapped pressure release incident
- IMCA
- Safety Flash
- IMCA SF 08/06
- Control of WorkIsolationPressure Systems
- Loss of containmentPressure systems
- Saturation diving
- Pressure vesselValve
- Marine industry
- Vessel
Summary
During saturation-system commissioning aboard a diving support vessel, a diver operated toilet valves out of sequence after assuming pressure was absent. A closed external valve left pressure trapped in the holding cylinder. Its release back-flushed raw sewage into the transfer chamber, covering the diver and fracturing the toilet seat.
Classifications: Loss of containment; containment loss.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Saturation diving; sat diving.
Classifications: Pressure vessel; pressure vessels.
Classifications: Valve; valves.
Classifications: Marine industry; shipping industry; maritime sector.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
Incorrect valve sequencing released trapped pressure and sewage into a diving chamber during saturation-system commissioning.
IMCA SF 08/06. Themes: control of work, isolation, pressure systems.