| 摘要 |
A method for removing a superstructure from a jacket placed on a sea-bottom, wherein a vessel is positioned in the vicinity of the jacket. In this operation, the problem of the superstructure colliding with the jacket during lifting thereof due to up and down movement caused by the vessel floating on the waves is real and present. The superstructure and/or the jacket can sustain damage. To avoid such damage, the superstructure is engaged by lift supports which are movable relative to the vessel. Once the movement of the vessel in the waves is detected, lifting of the superstructure from the jacket is started when it is detected that the vessel is situated below it's average depth level in the sea.
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