Safety Flash
Differential pressure: Dummy choke ejected close to divers
Differential pressure: Dummy choke ejected close to divers
- IMCA
- Safety Flash
- IMCA SF 12/23
- DivingIsolationLine of FirePressure Systems
- Line of firePressure systems
- Diving operationsInspection and maintenance
- Process pipework and pipelinesValve
- Competence and trainingEnergy and process isolationOperating and work proceduresRisk assessment
- Upstream oil and gas
- Subsea
Summary
A dummy choke insert was expelled by differential pressure during replacement work near two divers, who remained unharmed. The flash examines absent local venting, misunderstood pressure readings and unclear release expectations. It recommends explicit procedures and risk assessments, isolation training, confirmation of an open local vent and clarification of questionable instructions.
Classifications: Line of fire; struck-by hazards.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Diving operations; diving; commercial diving.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Process pipework and pipelines; process piping.
Classifications: Valve; valves.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Operating and work procedures.
Classifications: Risk assessment; hazard assessment.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Subsea; underwater worksite.
Summary
A dummy choke insert was ejected from a water injection (WI) tree by force of differential pressure, while two divers were working nearby; neither diver was in the direct line of fire; both were unharmed
IMCA SF 12/23. Themes: diving, isolation, line of fire, pressure systems.