ABS said it has granted approval in principle (AIP) for the Sevan cylindrical floating LNG production unit concept for offshore production, storage and transfer of LNG, LPG and condensate.
The FLNG design concept is based on the circular and geostationary Sevan FPSO design, which is being used in the Norwegian and Central UK North Sea and offshore Brazil and is under construction as the first application of an FPSO unit to be installed in the Barents Sea.
The full scope of design review for the FLNG concept includes an assessment of the feasibility of the structural strength of the equipped FLNG hull and process topside structure as well as a global performance and safety analysis conducted in accordance with the ABS Rules and Guides for floating LNG units.
The Sevan FLNG production unit will have a cylindrical hull capable of operating in more than 3,000 m water depth and in harsh environments, such as extreme North Atlantic and cyclonic conditions. The unit design is based on environmental load calculations for a 100-year return storm in the Barents Sea. Similar to the Sevan FPSOs, the FLNG unit’s axio-symetric hull shape enables high capacity for LNG storage and deck loads and tolerance for weather spreading and eliminates the need to weathervane in rough seas. The unit can be designed to have gas processing and liquefaction up to 4 MTPA and store up to 240,000 m3 of LNG and 36,000 m3 of condensate.
According to Sevan, some of the most significant advantages of a cylindrical hull design are the elimination of the need for a turret and swivel and the favorable motions with very little roll and pitch, as well as reduction of typical wave induced fatigue loads and minimized hull deflection, which simplifies the topsides design.
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Press Release; Image: ABS