Photograph of one of those very large spherical LNG tanks. In the ship the tank is supported near its equator by a short, axially stiffened skirt. When the tank is filled with LNG the supporting skirt is subjected to axial compression and therefore must be designed not to buckle.
Also the spherical tank must be designed not to buckle just below the equator when it is less than half filled, a type of buckling that is displayed in the next slide.
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