Stress-stain state of a vertical steel tank affected by bottom sediments in conditions of extreme temperature differences

Abstract

This article describes the analysis of the stress-strain state of the tank taking into account bottom sediments of oil products and the influence of the temperature of the oil product and the environment using the Ansys software package. Effects that oil product has separately and oil product with bottom sediments have on a stress-stain state are compared. Oil products having different temperatures of 20, 30, 40, 50 °С are examined in different series. Calculations at various ambient temperatures (-60, -50, –40 °С; –20 °С; 0 °С; +20 °С; +40 °С) are presented in each series. Different densities of oil product and bottom sediment were considered. Based on the analysis of the stress-strain state using finite element modeling on the example of a vertical steel tank, it was shown that the stresses in the zone of the miter weld, as well as in the places of installation of the receiving-distributing branch pipe and the manhole, are maximum. It is in these zones that the influence of bottom sediment and temperature is significant, since they form local elevated stress zones, which increase significantly when the walls are thinned.