Deep draft semi-submersible LNG floating production, storage and offloading vessel

摘要

The present disclosure provides a method, apparatus, and system of a deep-draft semi-submersible liquefied natural gas (LNG) floating production and storage vessel that can include a pontoon containing LNG tanks, fixed ballast at the bottom in a double-bottom portion, and segregated ballasted tanks with variable ballast located generally above the fixed ballast portion that can assist in keeping the pontoon submerged during various storage levels. Multiple vertical columnar supports can penetrate the pontoon from top to bottom and extend above the water surface to support a deck, including various topside structures. An intermediate double-deck on the top of the pontoon can provide access to the tanks, for example, through the vertical columnar supports. The double bottom structure, deck, and vertical columnar supports can provide overall structural integrity.