A method of lowering a discrete load from a pipelay vessel comprises: holding a rigid rod on an upright launch axis where the rod extends through a hold-back system; coupling a lower end of the rod to the load; connecting a wire to the load directly; operating the hold-back system to advance the rod downwardly, hence submerging the load, while the weight of the load is suspended from the hold-back system via the rod; when the load is underwater and beneath the splash zone, transferring the weight of the load from the hold-back system to the wire by detaching the load from the rod while the rod is held by the hold-back system; and continuing to lower the load in the water, suspended directly from the wire. The method may be reversed to recover a load from a subsea location, such as when lifting a wellhead or blowout preventer from the seabed.


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    Title :

    HANDLING LOADS IN SUBSEA OPERATIONS


    Additional title:

    HANDHABUNG VON LASTEN IN UNTERWASSEROPERATIONEN
    MANIPULATION DE CHARGES DANS DES OPÉRATIONS SOUS-MARINES



    Publication date :

    2023-02-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS



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