ROOF PART INNER SURFACE COLD INSULATION STRUCTURE OF LOW TEMPERATURE LIQUID STORAGE TANK

PURPOSE:To form a cold insulation material in a flat shape and support it with rigidity and to improve a cold insulation effect and a strength by filling a gap between a plate-form roof part in an outer tank and a cold insulation holding deck, suspended from the roof part and caused to horizontally span, with a cold insulation material. CONSTITUTION:A body part cold insulation material 5 is disposed on the inner surface of the inner wall of a cylindrical outer tank 10 and an inner tank 6 with which storage low temperature liquid 9 is sealed is installed through the cold insulation material 5. Meanwhile, a roof part primary airtight layer 2 is disposed on the inner surface of the storage tank roof part 1 of an outer tank 10 and a gap between the primary airtight layer 2 and a deck support beam 8 is filled with a cold insulation material 3. The roof part cold insulation material 3 is supported by rigid deck structure comprising a flat cold insulation material holding deck 7 and the deck support beam 8. Further, a part of the cold insulation material 3, i.e., a cold insulation material 4 of a part making contact with an expandable inner tank 6 is formed of a cold insulation material having elasticity. As noted above, an enough cold insulation effect and a strength against sloshing are ensured in a way that the cold insulation material 3 is formed in a flat shape and supported by rigid deck structure.