Safety Flash
Uncontrolled decompression of diving bell
Uncontrolled decompression of diving bell
- IMCA
- Safety Flash
- IMCA SF 10/04
- Confined SpaceDivingMachinery and EquipmentPressure Systems
- Confined space hazardsHuman factorsPressure systems
- Diving operationsPressure testing
- Diving bellValve
- Competence and trainingFunctional testing
- Vessel
Summary
A diving bell vented to surface from 175 fsw after the last man leaving accidentally kicked open an unsuitable quarter-turn valve. No injuries or equipment damage were reported. The flash discusses prior sealing problems, replacement with a small-bore needle valve, testing before vessel installation, familiarisation drills and cautious movement in confined spaces.
Classifications: Confined space hazards; confined-space hazards.
Classifications: Human factors; human performance; ergonomics.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Diving operations; diving; commercial diving.
Classifications: Pressure testing; hydrostatic testing; pneumatic testing.
Classifications: Diving bell; closed bell; wet bell.
Classifications: Valve; valves.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Functional testing; function test.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
A diving bell vented rapidly after an unsuitable valve was accidentally opened, exposing weaknesses in equipment testing, familiarisation and confined-space response.
IMCA SF 10/04. Themes: confined space, diving, machinery and equipment, pressure systems.