in einbaubarer's low - fluessigkeiten tank for tanker

摘要

A tank for cryogenic liquids, specifically liquid natural gas, adapted for placement within a conventional marine transportation vessel is shown. The tank is preferably cylindrical and of circular cross section and is comprised of prestressed concrete with steel heads. The tank wall is made up of a series of concrete, modular tank wall sections which are circumferentially prestressed by steel tendons and which have holes therein for through-passage of axial prestressing tendons. A steel sheath anchored to the concrete wall provides a secondary barrier against leakage of the liquid natural gas cargo within the tank. The modular wall sections are separated by concrete or steel stiffening disks. The tank is formed by alternately positioning a number of modular wall sections and stiffening disks. Flat, concrete, stiffening plates which are integral with the modular tank wall sections and are radially-axially positioned within the tank further stiffen the structure. The walls and the stiffening plates are axially prestressed and the heads are attached. The tank is supported on the annular stiffening disks which are joined to the tank wall. The tank makes efficient use of the vessels cubic and is inexpensive to construct. By preforming and prestressing the modular units and thereafter erecting them rapidly at the ship-building site or at a removed fitting out site, important economies are achieved.