N.A.T.O. The defensive military alliance formed in 1949 by ten european countries. WARSAW PACT A military alliance formed in 1955 by the Soviet Union Netherlands. Norway.
Tank Rings. Tank rings filled with gravel lift the tank above the surrounding grade. This keeps the tank out of standing water and increases the life of the tank bottom.
Here is my explanation in simple form: An annular plate is a ring of plates that sit directly underneath the shell plate. The bottom plate sits inside the shell plate and is welded to the annular ring plates. On a tank that doesnt have an annular ring, the bottom plates will extend from underneath the tank shell. There are weld spacing and other dimensions that need to be adhered to, but this is the main difference between annular and bottom plates. Viewed 194 times. Published on ast-forum.com.