Safety Flash
Lifting chains parted – hydrogen embrittlement
Lifting chains parted – hydrogen embrittlement
- IMCA
- Safety Flash
- IMCA SF 15/23
- CorrosionCrane and RiggingLifting OperationsStructural and Asset Integrity
- CorrosionMechanical failureStructural and asset integrity
- Lifting operationsRigging
- Lifting accessories
- Competence and trainingOperating and work proceduresRisk assessment
- Marine industry
- Vessel
Summary
Three lifting chains failed during a vessel demobilisation lift, leaving grillage suspended approximately 4 m above deck. It was lowered without injury. Analysis attributed failure to hydrogen embrittlement and corrosion cracking under tensile load. Replacement of the four-way bridle with slings and shackles enabled safe completion.
Classifications: Corrosion; corrosion damage.
Classifications: Mechanical failure; equipment failure.
Classifications: Structural and asset integrity; asset integrity; structural integrity.
Classifications: Lifting operations; load lifting; hoisting.
Classifications: Rigging; slinging.
Classifications: Lifting accessories; lifting gear; rigging gear.
Classifications: Competence and training; competency assurance; safety training.
Classifications: Operating and work procedures.
Classifications: Risk assessment; hazard assessment.
Classifications: Marine industry; shipping industry; maritime sector.
Classifications: Vessel; aboard ship; onboard vessel.
Summary
On a vessel involved in project demobilisation, three of four lifting chains on a load parted while the load was being lifted.
IMCA SF 15/23. Themes: corrosion, crane and rigging, lifting operations, structural and asset integrity.