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

  • US 6,364,574 B1
  • Filed: 11/21/2000
  • Issued: 04/02/2002
  • 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, comprising:

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

    b) a pair of trusses supported respectively by the pair of floating supports and positioned about the periphery of the package during lifting, the trusses forming a load transfer interface between the floating supports 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 floating support and an upper end that can be removably attached to the package;

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

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

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

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

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