IMCA provides lessons learned from an incident that involved damage to bulwarks, during the overboarding of a mattress stack using a mattress frame.
The incident
During the overboarding of a mattress stack (3x 150mm mattresses) using a mattress frame, the mattresses made contact with the port side bulwarks causing damage. Before and during the lift, the weather conditions were suitable for the operation.
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As the load was lifted outboard, a swell caused vessel motion which led to a pendulum effect on the mattresses. The mattresses then hit the port side bulwarks causing damage. No-one was injured.
Probable cause
The immediate cause of the damage was that the mattress stack made contact with the port side bulwarks during vessel motion due to swell as the load was overboarded.
Lessons learned
- Further engagement with deck crews to discuss worksite, crane / task specific challenges or difficulties they face during lifting operations;
- Explain the challenges associated with the lift because of deck / crane design including crane speed and limitations;
- Discuss anything the teams found challenging – with a view to proactive learning;
- Record and share as appropriate any concerns, challenges or ideas to improve things;
- Review lift plans and lift planning procedures to ensure prompts are provided to consider the limitations of the crane to be used including speed, line out, route for the lift etc.
