Abstract: An offshore structure for placement on a sea floor in a body of water containing moving ice masses, which impart Environmental Loads to the structure; the offshore structure includes a base which contacts the sea floor, the base having sufficient horizontal cross-sectional area such that a bearing pressure and a horizontal shear force, which result from Environmental Loads and which are transferred to the sea floor foundation by the foundation base, are less than at least one of a predetermined shear capacity and a predetermined bearing capacity for the sea floor foundation; and a hollow, watertight topside structure located at or above the waterline of the body which is supported by a support shaft extending vertically from the base through the topside structure.

Abstract: The invention is an apparatus, method and system for supporting risers in a floating platform. The apparatus comprises a table disposed above a hull-top surface, a first riser opening in the table, and a first dedicated riser tensioner attached to the table and disposed about the first riser opening. The apparatus further comprises a second riser opening, and a second dedicated riser tensioner attached to the table and disposed about the second riser opening. The method comprises tensioning a first riser with a first dedicated riser tensioner, and tensioning a second riser with a second dedicated riser tensioner, wherein the first dedicated riser tensioner is responsive to the second dedicated riser tensioner. The system comprises a mechanism for tensioning a first and a second riser, wherein the mechanism for tensioning the first riser is responsive to the second riser.

Abstract: The invention is an apparatus, method and system for supporting risers in a floating platform. The apparatus comprises a table disposed above a hull-top surface, a first riser opening in the table, and a first dedicated riser tensioner attached to the table and disposed about the first riser opening. The apparatus further comprises a second riser opening, and a second dedicated riser tensioner attached to the table and disposed about the second riser opening. The method comprises tensioning a first riser with a first dedicated riser tensioner, and tensioning a second riser with a second dedicated riser tensioner, wherein the first dedicated riser tensioner is responsive to the second dedicated riser tensioner. The system comprises means for tensioning a first and a second riser, wherein the means for tensioning the first riser is responsive to the second riser.