EXTENDED SPHERICAL LNG STORAGE TANK AND METHOD FOR MANUFACTURING THE SAME

摘要

The present invention provides an extended spherical LNG storage tank, installed on an LNG tanker, and a method for manufacturing the same, in which the junctions between a connection tank part and upper and lower tank parts are configured as smooth parts, thus increasing the LNG storage capacity of the tank and mitigating stress concentration on the junctions, and the connection tank part is constructed by integrating a plurality of plates into a single structure, thus increasing work efficiency while fabricating the connection tank part and thereby enabling quick and easy production of the LNG storage tanks. In the extended spherical LNG storage tank, which includes the upper and lower tank parts, each having a predetermined radius of curvature R, and the connection tank part provided between the upper and lower tank parts so as to increase the LNG storage capacity of the tank, the connection tank part is defined by a circular arc or a parabola C3, which is circumscribed with two circles Cl and C2, which define the upper tank part and the lower tank part, respectively, outside the two circles Cl and C2.