A method of lifting and recovering the substructure of an offshore platform using ballastable flotation means

摘要

A method for lifting and recovering the substructure 5 of an offshore platform 1 or like construction, using at least one ballastable flotation body 7, wherein the flotation body 7 is fixed at 9 to a part of the substructure 5, the flotation body is given a buoyancy by removing part of the ballast water, a separation/severing is made in the substructure at a point A below the connection point between flotation body and substructure, the buoyancy of the flotation body is increased by removing more ballast water, and the platform structure with attached flotation body/bodies is moved to the desired location. The flotation bodies 7 may be pivotally connected to the substructure at a lower point (see Figs 4 and 5 not shown).