Safety Flash
Dropped object due to over-ridden limit switch
Dropped object due to over-ridden limit switch
- IMCA
- Safety Flash
- IMCA SF 18/25
- Control of WorkCrane and RiggingDropped ObjectsLifting Operations
- Dropped objectsFunctional safetyMechanical failure
- Inspection and maintenanceLifting operations
- CraneWire rope
- Functional testingHuman-centred designPre-use checksStop-work authority
- Vessel
Summary
A vessel crane operator bypassed limit switches while raising the hook for an overboarding lift. A mini beacon struck the clump weight and fell to the deck; a restraint and sensor cable also parted. Nobody was injured. The flash examines knuckle-boom configuration, override decisions, safety-system verification and safer equipment design.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Functional safety; safety instrumented systems; SIS.
Classifications: Mechanical failure; equipment failure.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Crane; cranes.
Classifications: Wire rope; steel wire rope.
Classifications: Functional testing; function test.
Classifications: Human-centred design.
Classifications: Pre-use checks; pre-use inspection.
Classifications: Stop-work authority; stop work; stop-work intervention.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
A limit switch on a crane was over-ridden, resulting in wires parting and objects falling from the crane.
IMCA SF 18/25. Themes: control of work, crane and rigging, dropped objects, lifting operations.