The elastic analysis shows that stresses in the material are too high and the design hasn’t been approved. Several different analyses have been carried out in order to ensure that there are not too high stresses in the materials of the existing tanks due to the insertion of the manhole hatch and finally qualify construction according to EN-13445 norm. All tanks are filled with the water to the top 20 m high. The manhole hatch is designed applying standard API 650. For inspection purposes, assembly of manhole hatch on all tanks is required. ![]() There are several existing tanks of the same dimensions (20 m high and diameter 10,2 m), but they have different wall thicknesses (9,6 15 20 and 25 mm). The design of the inspection openings on the tanks is being considered. The aim of this paper is to demonstrate how the correct application of FEM analysis can be used to find effective solutions for the design of mechanical structures.
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