DEFINITION FEATURES OF WORK ALUMINUM COVERINGS OF VERTICAL STEEL TANKS AT TILT

Abstract

The floating coverings are used in vertical steel tanks to reduce the losses of the products stored there. Having better features the coverings of aluminum alloys have become wide-spread. Increasing the strength characteristics of the covering structure ensures the safe operation of vessels. The strength characteristics study involves the stress-strain state study of the coverings structures. In order to receive the characteristics of the impact of the stored product on the covering determining the load on the supporting structures of the floating cover, determine the critical provisions for the calculation of the strength, the mathematical model of the tank equipped by covering was made in the software package FlowVision. The of the floating covering in various operational positions was examined and the impact of the stored product on the covering design and the definition of the stress-strain, depending on the angle of slant were determined. The study was made in three stages. At the initial stage of the problem solving we constructed the three-dimensional model of the tank. For creating the geometry of the computational model of the tank the system of two-and three-dimensional computer-aided design and drafting AutoCAD was used, the geometric sizes were accepted on the basis of previously compiled baseline data for tank RVSP-5000. The floating covering and tank modeling was made separately to have an ability to vary the position of bodies relative to each other. At the next stage the incremental hydrogazodynamical calculation in FlowVision program was made. The final stage involves visualizing the results of hydrogazodynamical calculation processing, findings and conclusions. Based on the results of simulation and calculation the analysis of the operational positions of the covering at the rate of angle 0o, 1o, 5o, 10o. The results of calculation are shown visually as graphs of distribution parameters of pressure and speed module also we made the documentation values of investigated parameters in MS Excel format. The analysis of the results and studies of the floating cover in different positions revealed the of the covering influenced by the product stored. Hydrogazodynamical calculation results reflect the impact of the product stored on the tank floating cover during the exploitation. The research in PC FlowVision contributes not only to the study of the floating covering behavior in the tank , but also to model the stress state structures floating coverings, aluminum alloys, closest to the actual operating conditions.