There are cases when changing the properties of the reservoir base or complete removal of the segments of the base or foundation sludge tank occurs. This paper considers the limiting case - the complete absence of sector base, varying along a circular arc. We created finite element model of RVS-20000, which takes into account all the structural elements of metal tank, including support ring girder frame and roofing sheets. Various combinations of loading are analyzed. For maximum operational loads we considered unfavorable combination. Calculations are made for filling and emptying the tank. The values of the maximum possible deformation of the outer contour of the bottom sediment are evaluated in the development of non-uniform basis for this size tank. The parameters obtained intrinsic rigidity (deformability) of reservoirs can be used to develop new technical standards for tanks.
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