Purpose. Development of the mathematical model for making theoretical analysis regarding the effect of design factors and physical properties of materials of the combined hollow cylindrical casting on a maximum pressure limit of a working body (gas, liquid) in it. Methodology. Methods of comparative analysis, mathematic simulation and forecasting were used. Findings. The mathematical model for theoretical analysis regarding the development of design factors of the combined hollow cylindrical casting on a maximum pressure limit of a working body in it has been presented. Originality. Based on the results of theoretical research, ways of producing combined castings used under the increased internal pressure of working environment are shown. Furthermore, the suggested mathematical model facilitates the assessment of the effect of the properties of applied materials and dimensional factors of the casting on its boundary operation conditions. Practical value. Use of the suggested model allows making calculations of the properties of cylindrical elements of hollow combined casting considering their geometric dimensions. The results of the research can be used for designing combined casting products such as isolation valve.

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