Method and apparatus for the offshore installation of multi-ton prefabricated deck packages on partially submerged offshore jacket foundations

Patent · Mon Dec 21 23:00:00 EST 1987

OSTI ID:5451868

Khachaturian, J E

A method for the offshore installation of multi-ton prefabricated deep package on a jacket foundation is described comprising the steps of: a. transporting the prefabricated deck package to the site of the jacket base on a first transport barge; b. attaching a triangular truss-like lifting assembly to the deck package at multiple positions on the deck package at multiple positions on the deck package that are at least on generally opposite sides of the deck package, and at upper and lower positions on the deck package respectively and at vertices of the triangular truss-like lifting assembly; c. structurally supporting the triangular truss-like lifting assembly with one or more lift barges; d. removing the transport barge as a support for the deck package so that the deck is supported by the triangular truss-like lifting assembly and lift barges, with the deck package forming a load carrying portion of the triangular truss-like lifting assembly; e. aligning the deck package with the jacket so that the deck package can be placed on the jacket; and f. lowering the deck package upon the jacket by changing the length of the horizontal chord of each triangular truss-like lifting assembly.

• Assignee: NOV; NOV-88-001183; EDB-88-071641
• Patent Number(s): US 4714382
• OSTI ID: 5451868
• Country of Publication: United States
• Language: English

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