Offshore floating production, storage, and off-loading...

B - Operations – Transporting – 63 – B

Patent

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Details

B63B 35/44 (2006.01) B63B 22/18 (2006.01) B63B 25/00 (2006.01) B63B 39/00 (2006.01)

Patent

CA 2747255

An offshore floating production, storage, and off-loading vessel (10) has a hull (11) of generally cylindrical or polygonal configuration surrounding a central double tapered conical moon pool (13) and contains water ballast and oil and/or liquefied gas storage compartments. The exterior side walls (12) of the polygonal hull have flat surfaces and sharp corners to cut ice sheets, resist and break ice, and move ice pressure ridges away from the structure. An adjustable water ballast system induces heave, roll, pitch and surge motions of the vessel to dynamically position and maneuver the vessel to accomplish ice cutting, breaking and moving operations. The moon pool shape and other devices on the vessel provide added virtual mass for increasing the natural period of the roll and heave modes, reducing dynamic amplification and resonance due to waves and vessel motion, and facilitate maneuvering the vessel.

L'invention porte sur un navire de production, de stockage et de déchargement, flottant en mer (10), qui présente une coque (11) d'une configuration généralement cylindrique ou polygonale, entourant un puits central conique doublement effilé (13) et contenant un ballast à eau et des compartiments de stockage de pétrole et/ou de gaz liquéfié. Les parois latérales externes (12) de la coque polygonale ont des surfaces plates et des angles aigus pour couper des nappes de glace, pour résister à la glace et la rompre, et pour déplacer les arêtes de pression de glace loin de la structure. Un système de ballast à eau ajustable comprend des mouvements de pilonnement, de roulis, de tangage et de cavalement du navire pour positionner et manuvrer dynamiquement le navire afin d'accomplir les opérations de coupe, de rupture et de déplacement de la glace. La forme du puits central et d'autres dispositifs sur le navire fournissent une masse virtuelle ajoutée pour accroître la période naturelle des modes de roulis et de pilonnement, réduisant l'amplification et la résonance dynamiques dues aux vagues et au mouvement du navire, et facilitant la manuvre du navire.

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