Investigation Report
Safety warning after catastrophic failure of high pressure hydraulic anchor windlasses
Safety warning after catastrophic failure of high pressure hydraulic anchor windlasses
- MAIB
- Investigation Report
- Machinery and EquipmentPressure SystemsVessel and Mooring
- Line of fireMechanical failurePressure systems
- Anchor handling
- Rotating machinery
- Operating and work procedures
- Marine industry
- Vessel
Summary
This bulletin examines catastrophic failures of high-pressure hydraulic anchor windlass motors, including incidents causing serious injuries from debris. Preliminary metallurgical findings indicate extreme internal pressures. It describes weather monitoring and manoeuvring to reduce anchor-chain tension, requires stopping heaving when significant tension develops, and urges manufacturer investigation and engineering solutions.
Classifications: Line of fire; struck-by hazards.
Classifications: Mechanical failure; equipment failure.
Classifications: Pressure systems; stored pressure; pressurised systems; pressurized systems.
Classifications: Anchor handling; anchor deployment.
Classifications: Rotating machinery; rotating equipment.
Classifications: Operating and work procedures.
Classifications: Marine industry; shipping industry; maritime sector.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
Urgent recommendation to manufacturer and request for further information from ship owners, ship managers, windlass manufacturers, classification societies and marine accident investigation organisations.
Themes: machinery and equipment, pressure systems, vessel and mooring.