Investigation Report
Technician Struck by Bonnet Assembly During Control-Valve Maintenance
04-25-2025 1330 00133 GI 47 AP Required Evacuation, Other Injury (Medical Treatment)
- BSEE
- Investigation Report
- Unknown
- Human factorsLine of firePressure systems
- Inspection and maintenanceWorking at height
- Fall protection equipmentProcess pipework and pipelinesScaffoldValve
- Energy and process isolationJob safety analysisPermit to workPositive retention and reliable securing
- Upstream oil and gas
- Offshore installation
Summary
A valve technician was struck by a bonnet assembly during control-valve maintenance on Grand Isle 47 AP platform and fell onto the scaffold deck. The investigation examines unidentified trapped gas pressure, isolation verification, unsigned work authorisations, unsafe scaffolding and absent fall protection, alongside manufacturer instructions for retaining bonnet fasteners.
Classifications: Human factors; human performance; ergonomics.
Classifications: Line of fire; struck-by hazards.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Working at height; work at height.
Classifications: Fall protection equipment; safety harness; fall arrest equipment.
Classifications: Process pipework and pipelines; process piping.
Classifications: Scaffold; scaffolding.
Classifications: Valve; valves.
Classifications: Energy and process isolation; isolation; energy isolation.
Classifications: Job safety analysis; JSA; job hazard analysis; JHA.
Classifications: Permit to work; PTW; work permit.
Classifications: Positive retention and reliable securing.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.