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Hurricane Season Necessitates Heavy Lift by Bisso

01 Jan 2005

America's Bisso Marine Co Inc has completed the successful salvage of a 105 Class Liftboat from 258ft of water in the Gulf of Mexico. The liftboat, which was believed to have sunk in much shallower water in the mid 1980's, was discovered to be on top of a 20in pipeline after Hurricane Ivan.

Bisso took extreme care to remove the liftboat from the pipeline in order to avoid damaging it. As a precautionary measure the liftboat was lifted several feet above the pipeline then moved several hundred feet northward before being lifted to the surface.

Due to the depth of the water and because the liftboat needed to be lifted out of the water on location to be placed onto a materials barge for transport, Bisso specially configured the 600 ton capacity D/B Lili Bisso with an A&R winch and two specially designed single sheave blocks.

The liftboat was lifted from the -258ft seafloor to a +15ft materials barge in a single lifting operation. The specially designed lifting configuration exceeded a 5:1 safety factor.

MJ Information No: 20226

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