Modeling the impact of shell wall thickness thinning on the stress state

A large number of fire-flame-proof substances, complex technological processes, characterizes oil and gas industry. Ensuring safety and preventing accidents are important issues for oil and gas industry. Modeling in modern software systems contributes to assessing the current situation and making the right decisions to extend safe operation life and increase equipment reliability. The wall thickness of a shell, even before putting in operation, is differential. In this paper, the effect of shell wall thickness thinning on the stress state is considered, taking into account the possible permissible deviation within the limits of GOST. The purpose of research is to prove the necessity and importance of taking into account uneven distribution of wall thickness for calculations. The object of study is cylindrical shell made from steel 09G2S. The thinning zone varied along the length of the study object. According to calculations result in SolidWorks software package, thinning, within the permissible possible deviation, at low pressures does not pose a danger. In case of increase in pressure up to 6 MPa and above, which is often used in complex technological processes, it leads to stress increasing in shell wall, which can contribute to strength characteristics deterioration. The results of research emphasize the importance of taking into account all features of a research object in 3D modeling, because it is at the heart of a new promising method of production management, like a digital twin.