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Method and apparatus for the offshore installation of multi-ton packages such as deck packages and jackets

  • US 6,149,350 A
  • Filed: 08/21/1997
  • Issued: 11/21/2000
  • Est. Priority Date: 03/15/1995
  • Status: Expired due to Term
First Claim
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1. A lifting apparatus for lifting a multi-ton package such as a deck package, sunken vessel, or offshore jacket, comprising:

  • a) a pair of barges, each defining a base that can support a large multi-ton load;

    b) a truss supported respectively by the barges and positioned about the periphery of the package for forming a load transfer between the barges and the package to be lifted;

    c) each said truss including at least one diagonally extending lift boom, each lift boom having a lower end attached to a barge and an upper end that can be attached to the deck package;

    d) lower connections for forming attachments of the truss to the package;

    e) each boom having a free end with a lifting end portion;

    f) a receptacle attached to the package that receives the lifting free end portion;

    g) wherein the lifting end portion engages the receptacle as the boom angle of inclination is gradually increased; and

    h) means for raising and lowering the combination of the truss and the supported package.

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