Safety Flash
Near-miss incident lowering concrete mattress
Near-miss incident lowering concrete mattress
- IMCA
- Safety Flash
- IMCA SF 11/01
- Control of WorkCrane and RiggingDivingLifting Operations
- Human factorsLine of fire
- Diving operationsLifting operations
- CraneOperator displays and control interfaces
- Lifting planOperating and work proceduresOperational supervisionSafety communication
- Marine industry
- SubseaVessel
Summary
A diving near miss involved a concrete protection mattress reaching the seabed about two metres from divers, without injury. An unzeroed crane meter and unchecked assumptions during operator changeover produced misleading depth readings. The flash records reminders on surface zeroing, depth reporting, supervisory instructions and avoiding changeovers during load movement.
Classifications: Human factors; human performance; ergonomics.
Classifications: Line of fire; struck-by hazards.
Classifications: Diving operations; diving; commercial diving.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Crane; cranes.
Classifications: Operator displays and control interfaces.
Classifications: Lifting plan; lift planning.
Classifications: Operating and work procedures.
Classifications: Operational supervision.
Classifications: Safety communication; toolbox talk; toolbox talks.
Classifications: Marine industry; shipping industry; maritime sector.
Classifications: Subsea; underwater worksite.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
A concrete mattress was lowered closer to divers and the seabed than intended because crane depth readings were not correctly reset.
IMCA SF 11/01. Themes: control of work, crane and rigging, diving, lifting operations.