ASME Spherical Storage Tank. internal pressure loads a sphere evenly across the entire shell. There is no corner, no knuckle and no flat face to concentrate stress, so there is no obvious place for a vessel to fail first.; a sphere encloses a given volume with less shell than any other shape. Less steel to buy, and less area for heat to leak through in cold service.; the even stress distribution means a sphere needs roughly half the wall thickness of a cylinder of the same diameter at the same pressure.. Contact Bluegrass Shipping Containers for availability and delivery details.