Wednesday, May 12, 2021

Tag: mooring

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Lessons learned: Uncontrolled movement of mooring chain

In its recently published Safety Flashes, IMCA descirbes a near miss incident of an uncontrolled movement of very heavy mooring chain during chain laying operations. The incident There was a sudden and uncontrolled movement of very heavy mooring chain during chain laying operations. A vessel was laying a 170mm diameter bottom chain from a suction anchor towards an FPSO. When the chain end was approaching, the shark jaw was engaged onto the chain to remove tension, in order to enable handling of the chain end from its chain locker. The last few chain links of the bottom chain then moved uncontrolled over the chain handling unit and rolled/dropped on deck, under its own weight, in between the chain lifter and the winch hangar. The bosun was located close to where the chain dropped and moved away when he noticed the uncontrolled chain movement starting. According to IMCA: The circulation pump on the chain handling unit tripped, causing the chain lifter to loose its holding force, and hence the chain catenary forward of the unit pulled the tail end over. Findings: This was a new vessel with as yet, a lack of full implementation of required safety systems. There was insufficient ...

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