Storage tank having a protective wall construction

A storage tank for storing liquefied gas, such as natural gas, ethylene, propylene, ammonia, at low or cryogenic temperatures, comprising a base plate;

• a side wall structure supported on said base plate including an outer wall and an inner wall spaced from and surrounded by the outer wall;
• thermal insulation material filling the interspace between said walls, said outer wall being a reinforced concrete wall, tensioned wires in said outer wall for circumferentially pre-stressing said wall, said outer wall resting on said bottom plate, the inner side of the outer wall being coated with a layer of a foam of a polyurethane type, said layer merging at its lower end into an annular horizontal layer of the same material coating a portion of said base plate, an annular concrete layer covering said horizontal layer;
• sealing means inserted between said outer wall and said plate providing a liquid-tight connection between said wall and plate, said sealing means being a mortar of a bonding type;
• vertically tensioned wires being anchored in said outer wall and in said base plate for tensioning said outer wall with respect to said base plate.