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DEVELOPMENT OF THE WORLD'S LARGEST ABOVE-GROUND FULL CONTAINMENT LNG STORAGE TANK

Korea Gas Corporation (KOGAS) has developed the world’s largest above-ground full containment LNG storage tank with a gross capacity of 200,000m. The main objective of the development of the large capacity LNG storage tank is to reduce the construction cost and the boil-off gas and use the tank building site more effectively. The large tank was designed for the KOGAS’ Tongyoung and Pyeongtaek LNG Receiving Terminals. The design work was done through numerous structural, thermal and seismic analyses. The tank consists of 9% nickel steel inner tank, pre-stressed concrete outer tank, suspended ceiling deck, secondary bottom and corner protection system, and bottom heating system. The design boil-off rate (BOR) used in the design is 0.05% in volume per day. The inner tank has a diameter of 84m and the thickness of shell insulation is 1200mm. The 9% nickel steel plates with a thickness of 32.9mm were used for the first course of inner shell. The design was used for the construction of new tanks in the Tongyoung and Pyeongtaek LNG Receiving Terminals. This paper introduces the basic design concept and features of the large capacity 9% nickel full containment LNG storage tank developed by KOGAS.