Patent ID: 7500592
Filing Date: 2009-03-10
Classification: E04H

Abstract:
1. A method of storage tank construction, comprising providing a prepared base, building a tank floor on the prepared base, providing templates around the tank floor, placing pre-curved plates on the templates and welding together longitudinal ends of the plates and completing a first cylindrical ring shell, providing lifters around the first cylindrical ring shell and raising the first cylindrical ring shell with the lifters and holding the first cylindrical ring shell in an upward position with the lifters, placing pre-curved plates on the templates and welding ends of the pre-curved plates together and forming a second cylindrical ring shell spaced beneath the first cylindrical ring shell, lowering the first cylindrical ring shell near the second cylindrical ring shell and circumferentially welding lower edges of the first ring shell and upper edges of the second ring shell together, engaging the second ring shell with the lifters and raising the second ring shell and the first ring shell, similarly positioning pre-curved plates of sequential ring shells on the templates and welding longitudinal ends of the pre-curved plates together, forming sequential ring shells, lowering above preassembled cylindrical ring shells to a lower ring shell, welding an upper edge of the lower ring shell circumferentially to a lower edge of the above ring shell, engaging the lower ring shell and raising the lower ring shell and the above ring shells, removing the templates, positioning bottom pre-curved plates in contact with the floor, vertically welding the bottom pre-curved plates end-to-end and forming a bottom cylindrical ring shell, lowering the above assembled cylindrical ring shells so that a lower edge of the lowermost above ring shell is adjacent an upper edge of the bottom ring shell, welding the adjacent lower and upper edges circumferentially, welding a lower edge of the bottom ring shell to the floor and completing the storage tank, wherein the providing the templates further comprises providing the L-shaped plates with exterior vertical members, and wherein the placing of the pre-curved plates comprises placing the pre-curved plates inside the vertical members.