Investigation Report
Windlass Frame Failure During Mooring Line Construction Stretch Removal
05-15-2009 16:00 G27306 MC/736 Incident >$25K
- BSEE
- Investigation Report
- Unknown
- Mechanical failureStructural and asset integrity
- Inspection and maintenanceMooring operations
- Mooring linesWinch
- Positive retention and reliable securing
- Upstream oil and gas
- Offshore installation
Summary
Investigation of a windlass frame failure during construction stretch removal on Thunder Hawk’s mooring system. Mooring line 10 fell to the seabed and adjacent windlass equipment was damaged. Forensic studies identified inadequate frame design for the loads experienced; the report discusses secondary line control, enhanced designs, repairs and post-incident inspections.
Classifications: Mechanical failure; equipment failure.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Inspection and maintenance; asset inspection; equipment maintenance.
Classifications: Mooring operations; berthing; unmooring.
Classifications: Mooring lines; mooring rope; mooring wire.
Classifications: Winch; winches.
Classifications: Positive retention and reliable securing.
Classifications: Upstream oil and gas; oil and gas extraction; upstream petroleum.
Classifications: Offshore installation; offshore platform; offshore rig.