Safety Flash
High potential near miss – unsecured sheave
High potential near miss – unsecured sheave
- IMCA
- Safety Flash
- IMCA SF 12/19
- Crane and RiggingDropped ObjectsLifting OperationsLine of Fire
- Dropped objectsHuman factorsLine of fireMechanical failure
- Rigging
- Operator displays and control interfaces
- Human-centred designOperating and work procedures
- Vessel
Summary
This safety flash describes a vessel near miss in which inadvertent control activation moved a power swivel, changing a tagline’s orientation and opening a sheave gate. A 40 kg assembly remained suspended above crew. Lessons address console design, sheave installation standards, operator visibility and clearer responsibilities across overlapping operations.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Human factors; human performance; ergonomics.
Classifications: Line of fire; struck-by hazards.
Classifications: Mechanical failure; equipment failure.
Classifications: Rigging; slinging.
Classifications: Operator displays and control interfaces.
Classifications: Human-centred design.
Classifications: Operating and work procedures.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
A sheave gate opened when a tagline changed direction, leaving a 40-kilogram assembly suspended above workers.
IMCA SF 12/19. Themes: crane and rigging, dropped objects, lifting operations, line of fire.