The development of a design procedure for bolted gasketed pipe flange connections based on allowable leak rates has been carried out by the technical committee for sealing technology of pressure equipment organized in the High Pressure Institute of Japan. This procedure covers the design of flange connections used at room temperature. The point preeminent of this procedure is that the maximum allowable leak of the flange connection is obtained by the minimum required initial bolt preloads determined by the elastic interaction analysis of flanges, bolts, and gasket considering thier flexibilities and stiffnesses. The paper explains the design process of this procedure and gives the technical background. The paper also shows some of examples obtained through the validation of this design procedure and the design studies for actual applications.

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