FEM Stress Analysis and the Sealing Performance Evaluation in Box-Shaped Bolted Flange Connections with Non-Asbestos Compressed Sheet Gaskets Subjected to Internal Pressure at Elevated Temperature

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  • 高温度下での内圧を受ける非石綿ガスケット付き箱型圧力容器締結体の有限要素応力解析と密封性能評価
  • コウオンド カ デ ノ ナイアツ オ ウケル ヒイシワタ ガスケット ツキ ハコガタ アツリョク ヨウキ テイケツタイ ノ ユウゲン ヨウソ オウリョク カイセキ ト ミップウ セイノウ ヒョウカ

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Abstract

The contact gasket stress distribution in a box-shaped bolted flange connection with non-asbestos compressed sheet gasket subjected to internal pressure at elevated temperature is analyzed taking into account a hysteresis of the gasket behavior using finite element method (FEM) for estimating an amount of leakage from the gasket interfaces in the connection. Leakage tests were also conducted using an actual connection subjected to internal pressure at the elevated temperature to demonstrate the validity of estimated results. The effects of the test temperature, liner thermal expansion coefficients of the flanges and the gasket, and bolt preload are examined on the contact gasket stress distributions. In addition, a method for determining the bolt preload for satisfying the allowable leak rate at the elevated temperature is examined using the estimated results. The estimated leakage is in a fairly good agreement with the measured result. It is found that the estimated bolt preload using the allowable leak rate of inner fluid can be determined conservatively. In addition, the differences on the gasket characteristics on the asbestos and the non-asbestos sheet gasket are shown.

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