An arrangement for supporting a cylindrical or spherical rigid tank comprising several spaced bearing devices distributed about said tank and comprising each one a horizontal bracket member integral with and projecting radially outwards from said tank in its horizontal axial or diametral plane, a horizontal arm below and parallel to said bracket member and pivoted to a fixed fulcrum in the vertical plane tangent to the geometrical envelope of the neutral fibers of the tank wall and two parallel links spaced outwards from said fulcrum and pivoted to said bracket member and arm to form a deformable vertical parallelogram.