Title: Methods and apparatus for applying buoyant forces to offshore tower legs and providing and enclosing buoyancy chambers

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Abstract: Improvements in buoyancy structures independently comprising each of A radiating, circumferentially extending buoyancy cell network encircling an offshore jacket leg, and A double-walled buoyancy chamber wall fabricated from a shell and overlapping pipe segments bonded thereto. An offshore platform jacket assembly is disclosed in which a plurality of jacket legs are anchored by piling members to the bed of a body of water. A buoyancy unit is disposed at a lower portion of the jacket in association with at least one of the jaket legs. Each buoyancy unit comprises a chamber disposed around its respective leg. Each chamber is divided into a plurality of circumferentially displaced, radiating cells and these cells are disposed inwardly of a periphery defined by a series of piling guides spaced around the leg. A plurality of generally upright divider fins extend radially outwardly from the leg to divide the chamber into the radiating cells which are arranged about the leg for the reception of a buoyant medium. The fins are operably connected to the piling guides to transmit forces in a generally uniform manner between the leg and the piling guides. In one preferred embodiment, the buoyancycells are of less than water-tight construction and are filled with a buoyancy-generating foam. In another preferred embodiment of the invention, the buoyancy cells are of water-tight construction and are reinforced by a double-wall construction which includes overlapping pipe segments, welded to the interior periphery of a chamber-defining shell situated around the tower leg. A double-walled buoyancy chamber including a shell wall and an edge overlapping network of pipe segments bonded thereto.


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