Abstract: An apparatus and method for lifting tanks including supporting roof columns including the temporary installation of column support assemblies to those columns to permit cutting them at a sufficient distance from the bottom to allow a reinforced U-shaped support structures to be placed under the columns. A lifting device is placed below the U-shape support structure and in cooperation with wooden logs in criss-crossed arrangement, the structure is blocked up and down. The U-shaped support structures are interconnected to each other with rails that are soldered to the bottom of the tank thereby lifting the bottom simultaneously with the lifting of the columns and roof. The present apparatus and method is to be used in conjunction with lifting apparatus and methods associated with the outer peripheral wall of the tank.

Abstract: An apparatus for lifting tanks where several hydraulic jack assemblies are positioned adjacent to the external peripheral wall of the tank and, if the tank has large dimensions, additional hydraulic jack assemblies are positioned inside the tank. After the jack assemblies are secured to the tank structure, the lifting operation is begun. The jack assemblies provide the necessary lifting force from a substantial hydraulic pressure and relatively small displacement. The jack assemblies are inverted so that the housing is lifted while the rod stays stationary. After complete distension, log members are inserted below the lowermost end of the jack housing and the rod retracted. Then, an additional log member is inserted below the retracted rod and the lifting operation renewed.

Abstract: A process for lifting tanks where several hydraulic jack assemblies are positioned adjacent to the external peripheral wall of the tank and, if the tank has large dimensions, additional hydraulic jack assemblies are positioned inside the tank. After the jack assemblies are secured to the tank structure, the lifting operation is begun. The jack assemblies provide the necessary lifting force from a substantial hydraulic pressure and relatively small displacement. The jack assemblies are inverted so that the housing is lifted while the rod stays stationary. After complete distension, log members are inserted below the lowermost end of the jack housing and the rod retracted. Then, an additional log member is inserted below the retracted rod and the lifting operation renewed.