A system and corresponding method for decommissioning an offshore platform (fig 1, 10), the offshore platform comprising a topside (fig 1, 12) and a support structure (fig 1, 14). The system comprises a topside lifting unit adapted to lift the topside from the support structure, a support structure lifting unit adapted to lift the support structure from the water such that the support structure is supported by the vessel, and a vessel 100 configured to interchangeably receive the topside lifting unit and the support structure lifting unit. The vessel comprises a hull 110 which is adapted to accommodate an installed support structure, for example by incorporating a slot 112, and a ballasting system for lifting the topside. The vessel 100 may further comprise an energy recovery system comprising turbines (fig 2c, 118a) mounted in ducts (fig 2c, 118) below the waterline.


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    Title :

    Offshore decommissioning vessel and methods of use


    Contributors:

    Publication date :

    2019-01-09


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS



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