Abstract
The paper deals with the analysis of reliability and safety of a welded tank for the storage of oil, which is located in the Czech Republic. The oil tank has a capacity of 125 thousand cubic meters. It is one of the largest tanks of its kind in the world. Safety is ensured by a steel outer intercepting shell and a double bottom. The tank was modelled in the programme ANSYS. The computational model was developed using the finite element method – elements SHELL181. A nonlinear contact problem was analysed for the simulation of the interaction between the bottom plate and foundation. The normative approach in design and check of tanks according to standards API 650, ČSN EN 14015, EEMUA 159 and API 653 is mentioned. The dominant loading of the filled tank is from oil. The normative solution is based on the shell theory, which considers constant wall thickness. For real tanks sheet thicknesses of individual courses increase with increasing depth. Stochastic sensitivity analysis was used to study the effect of the variability of the thickness of the ith course on the stress of adjacent courses. The Latin Hypercube Sampling method was implemented during analysis.
Highlights
Czech Republic has crude oil reserves for 94 days
From the analysis of the stress state along the height of the tank it was found that the reduced stress acc. to von Mises (SEQV), reduced stress acc. to Tresca (SINT) and circumferential stress SY have approximately the same course, see Figure 10
Comparison of stress SEQV of all four models showed that the effect of the boundary conditions of the stiffness of the bottom is not significant with the exception of the first course, where the difference was up to 100 MPa
Summary
Czech Republic has crude oil reserves for 94 days. It is one of the largest storage tanks of its kind in the world. Z. Kala et al Sensitivity analysis of the stress state in shell courses of welded tanks for oil storage. Safety is ensured by its double steel cover – steel outer intercepting shell and double bottom, see Figure 3. The structural design consisting of the shell of steel outer intercepting shell and steel tank allows the erection of tanks closer to each other leading to savings on otherwise needed space for containment dikes. The design criteria of the mentioned standards are based on the allowable stress design concept
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