ガスケット付き圧力容器ふた締結体の有限要素解析と密封性能
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概要
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Finite Element analysis on a bolted flange connection with a cover of pressure vessel (CPV) , in which a spiral wound gasket was inserted, under internal pressure was performed by taking hysteresis of the gasket into account. Leakage on an actual bolted flange connection with a CPV a spiral wound gasket inserted was also measured and its leak tightness was obtained by the experimental tests. Using the calculated contact gasket stress distribution in the bolted flange connection with the CPV under internal pressure and the measured tightness parameter, the values of new gasket constants were obtained by taking account the contact gasket stress reduced by internal pressure. The difference in the new gasket constants between the estimated values obtained from the actual bolted flange connection with the CPV and those obtained by the procedure specified by the PVRC was small. In addition, a method was demonstrated that determines the required bolt preload to achieve the required tightness parameter under internal pressure. The obtained results of the bolt preload for the bolted flange connection with the CPV were in a fairly good agreement with those obtained by the PVRC procedure under a lower pressure application. In PVRC procedure, 1. 5 times of the required tightness parameter in pressurized condition is used to determine the bolt preload. However, it was shown that the factor 1. 5 used in PVRC procedure was insufficient under a higher pressure application.
- 一般社団法人 日本高圧力技術協会の論文