Safety Flash
Subsea lifting and dropped loads
Subsea lifting and dropped loads
- IMCA
- Safety Flash
- IMCA SF 01/99
- Crane and RiggingDivingDropped ObjectsLifting Operations
- Dropped objectsMechanical failure
- Lifting operationsRiggingROV operations
- Lifting accessoriesRemotely operated vehicle
- Operating and work proceduresPositive retention and reliable securingRisk assessment
- Marine industry
- SubseaVessel
Summary
Four incidents concern dropped subsea loads and an inadvertently released ROV. The flash discusses basket drag and snatch loading, displaced shackle retention, single-link load transfer and possible seized latch rollers. Reported measures include strengthened brackets, vessel-specific sea-state limits, secure shackle retention, revised transfer procedures and latch checks.
Classifications: Dropped objects; falling objects; DROPS.
Classifications: Mechanical failure; equipment failure.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Rigging; slinging.
Classifications: ROV operations; remotely operated vehicle operations.
Classifications: Lifting accessories; lifting gear; rigging gear.
Classifications: Remotely operated vehicle; ROV; underwater robot.
Classifications: Operating and work procedures.
Classifications: Positive retention and reliable securing.
Classifications: Risk assessment; hazard assessment.
Classifications: Marine industry; shipping industry; maritime sector.
Classifications: Subsea; underwater worksite.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
Several subsea loads were dropped because of latch failures, unsuitable rigging, misunderstood load dynamics and inadequate sea-state controls.
IMCA SF 01/99. Themes: crane and rigging, diving, dropped objects, lifting operations.