What do you mean when you say shell courses? Is it the height of the of the material used for the construction of the tank? Is it the layers added on the predefined thickness of the material?
a continuous horizontal layer of bricks or other building material.
In tank building it is each "ring" of plate forming the shell of the tank, starting with the bottom course which attaches to the floor and finishes with the top course which normally would attach to the roof.
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If you can't explain it simply, you don't understand it well enough. (A.E.)
Shell Courses
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