engleski

Wall thickness influence on allowable pressure of cast steel globe valve body

In the process industry, globe valves are used to shut off and regulate fluid flow in pipelines. The main valve component carrying the internal pressure is the valve body. For safe exploitation, the valves are designed with the allowable internal pressure taken into consideration. The aim of this paper is to investigate the influence of the wall thickness on the allowable and failure pressures of two- and tree-way globe valve bodies, DN50 and DN100 respectively. Twice-elastic-slope (TES) and the tangent intersection (TI) methods are used to obtain the plastic collapse pressures at the critical location which is determined at the location where maximum equivalent plastic strain throughout the valve body thickness reaches the outer surface. Obtained values are used subsequently to calculate corresponding allowable pressures according to the limit design method, while the failure pressure at the same location is determined as the highest point from the load-displacement curve. Calculated allowable pressure values, for both valve bodies, are compared with the corresponding ones that are obtained using the EN standard.

plastic collapse pressure; limit design method; allowable pressure; globe valve body

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