Study on structure strength design of large square opening of jacketed equipment

Abstract

Due to the requirement of process, a large square opening is set through the wall thickness of shell and jacket of a jacked equipment, for which this equipment does not meet the design requirement of “design by rules”. In this paper, the geometric model of this jacketed equipment with large square opening is established, and then the finite element mesh model is obtained by the method of sweep. Based on this, a corresponding load is imposed on the inner and outer wall of the shell, the inner wall of the jacket, the inner wall of the square box flange, and the bolt section of the square box flange. And a fixed constraint is imposed on the cross section of the shell and jacket. Then the stress distribution is obtained by the analysis and calculation of the model. In the high stress areas, stress linearization method is used to check the strength. Different paths are set along the thickness direction of the shell, jacket, square box plate, etc. According to analysis of the results above, it is found that the large square opening structure of jacketed equipment satisfies the strength requirements under the calculated conditions, and the most dangerous area is the joint of square box and square box flange or the joint of shell and nozzle.