Gas offloading system

B - Operations – Transporting – 65 – B

Patent

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Details

B65B 1/04 (2006.01) B63B 35/28 (2006.01)

Patent

CA 2537496

A system (10) is described for offloading LNG (liquified natural gas) from a tanker (13) for eventual delivery to an onshore gas distribution station (42). The system includes a floating structure (12) that floats at the sea surface and that is connected to the tanker so they weathervane together. The floating structure carries a regas unit (22) that heats the LNG to produce gas, and delivers the gas through a riser (32) to an underground cavern (30) that stores the gas. Gas from the cavern is delivered through a seafloor pipeline (40) to an onshore gas distribution station. The regas unit includes water pumps and other equipment that is powered by electricity. The electricity can be obtained from an electric generator (200) on the floating structure, with surplus electricity delivered through a seafloor electric power line (194) that extends at least partially along the seafloor to an onshore electricity distribution facility (192). The electricity can instead be obtained by delivery from an onshore facility though a seafloor electric power line that extends up to the floating structure and to the regas unit.

L'invention concerne un système (10) de déchargement de gaz naturel liquéfié depuis un méthanier (13) pour la livraison d'un terminal côtier de distribution (42). Le système comprend une structure flottante (12) qui flotte à la surface de la mer et qui est reliée au navire aux fins de girouette mutuelle. La structure comporte une unité de regazéification (22) qui chauffe le gaz naturel liquéfié pour la production de gaz, et distribue le gaz via une colonne (32) à une caverne souterraine (30) de stockage. Le gaz de cette caverne est distribué via un pipeline (40) au terminal. L'unité de regazéification comporte des pompes à eau et d'autres équipements électriques alimentés par un générateur (200) sur la structure, et un surplus d'électricité provient d'une ligne sous-marine (194) qui s'étend au moins en partie le long du fond à destination d'une installation de distribution d'électricité (192). L'alimentation peut aussi provenir d'une installation côtière via une installation conduite sous-marine qui s'étend jusqu'à la structure et à l'unité de regazéification.

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