| 摘要 |
1,203,496. Cold liquefied gas storage tanks. CONCH INTERNATIONAL METHANE Ltd. 29 Jan., 1969 [1 March, 1968], No. 10166/68. Heading F4P. A cold liquified gas, e.g. methane storage tank 4, Fig. 1, is surrounded by heat insulation material 5 and the lower highly stressed portion A of the material bears the load of the tank within an outer rigid shell, e.g. the inner ball 2 of a ship whilst the upper less-stressed heat insulation portion 13 is of foamed plastics material, e.g. polyurethane which is sprayed in situ on the inner face of the hull 2. The insulation portion A extends beneath the tank 4, which is of self-supporting cold-resisting metal, and part way up each side wall and comprises balsa wood panels 7 set on wood ground strips 6 and faced with plywood. The upper insulation portion B is formed of successive layers of foamed plastics 10 with intervening hessian mats 12, Fig. 2, the lower ends of which are enclosed in slots 7b in the chamfered edge 7a of the topmost panel 7 whilst their upper ends are fixed to a block 13 fixed to the upper end of each side of the tank 4. In a modification the tank (18), Fig. 4 (not shown) is of the non-selfsupporting membrane type and is supported against hydrostatic and inertia loads by lower and upper heat insulation portions similar to those shown in Fig. 1. Extra support for the horizontal and vertical corners are provided by angle brackets (19). |
