INDEPENDENT TANK WITH CURVATURE CHANGE SECTION, AND MANUFACTURING METHOD FOR INDEPENDENT TANK

摘要

Provided is an independent tank, and a manufacturing method therefor, for which local bending stress occurring on the vicinity of a boundary portion (welded portion) can be reduced without increasing plate thickness. An independent tank (1) has at least one curvature change portion in which the curvature along the axial direction of plate members (2, 3) that form the tank changes along the axial direction. Both the inner peripheral surface and the outer peripheral surface of the plate member (2) on the small curvature side are not flush with respect to the inner peripheral surface and the outer peripheral surface of the plate member (3) on the large curvature side. The plate thickness center of the plate member (2) on the small curvature side is offset toward the radial direction inner side or the radial direction outer side with respect to the plate thickness center of the plate (3) on the large curvature side.