Hydraulic and earth engineering – Marine structure or fabrication thereof
Reexamination Certificate
2006-09-05
2009-06-30
Lagman, Frederick L (Department: 3672)
Hydraulic and earth engineering
Marine structure or fabrication thereof
C405S223100, C405S205000, C114S265000, C114S264000
Reexamination Certificate
active
07553106
ABSTRACT:
A method for making a deep draft semi-submersible drilling/production vessel having a center of gravity below its center of buoyancy by constructing a plurality of buoyant individual columns. The method connects a pair of columns with at least a first top truss and a first bottom truss. The method additionally floats a connected first and second columns horizontally in water. The method floats the semi-submersible structure to a location for installation. The method concludes by deballasting the semi-submersible structure with connected deck forming a semi submersible drilling/production vessel having a center of gravity below its center of buoyancy with a draft between 300 and 500 feet.
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