Alerts & Learnings

Dropped Object from Crane Boom Tip Causing Injury to IP Foot

During normal platform lifting operations, under no load, an object fell from the crane boom tip, descending a height of approximately 20m before deflecting off a container and striking the IP on the foot who was situated approximately 5m away.

Subsequent investigation determined the dropped object to be a rope sheave guide bar (Weight: 1.03Kg) that had become detached from the boom tip due to failure of the nylon locking nut. On further review, it was found that the nylon locking nut was badly corroded and had been removed during recent maintenance operations and then re-used as a temporary measure until a replacement nut could be sourced. The subsequent operation of the crane introduced sufficient dynamic loading to loosen the nut, resulting in it falling from the crane and allowing the rope guard bar to fall to deck.

The drops calculator showed that a direct impact of the object from this height could have resulted in a fatality.

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