Patent ID: 8267032
Filing Date: 2012-09-18
Classification: B63B

Abstract:
1. A semisubmersible substructure for offshore applications comprising: a plurality of columns arranged in pairs around a central vertical axis of the semisubmersible substructure, wherein each of the pairs of columns comprise an inner column and an outer column connected to one another by a connecting node, wherein the inner columns are buoyant and the outer columns are buoyant, wherein the inner columns, the outer columns, or both support a deck of the semisubmersible substructure, wherein each outer column is permanently secured to an adjacent inner column to provide stability and resist forces during installation and operation, wherein main pontoons connect adjacent lower ends of the pairs of columns to one another by way of connecting nodes, wherein each connecting node is disposed between the inner column and the outer column of an associated pair of columns, wherein each connecting node comprises at least one of a pontoon, a truss member, a buoyant connection, a plurality of buoyant connections, a plurality of truss members or a combination thereof; and a lateral mooring system configured to maintain a position of the semisubmersible substructure at a desired location, wherein the lateral mooring system comprises lateral mooring system equipment disposed on at least one of the outer columns and a chain-wire-chain, a chain, a chain-polyester-chain, or combinations thereof engaged with the lateral mooring system equipment.