A Simple Analysis and Design Method of Bolted Pipe Flange Connections With Gaskets Under Internal Pressure

In designing pipe flange connections, it is important to examine the hub stress, bolt load and the gasket stress distribution which governs the sealing performance. However, actually a simpler calculation method is needed for designing a pipe flange connection. In the present paper, a simpler calculation method is proposed using shell-ring theory which is modified Kohmura method. In the present calculation method, a separation point at the gasket interfaces can be estimated accurately, in addition to the rigidity of flange and the bolt preload for a given allowable amount of gas leakage. In addition, a design method taking account the leakage is demonstrated and calculation examples are also shown for better understanding.