THE SEALING PERFORMANCE IN FLEXIBLE BOX-SHAPED FLANGE BOLTED JOINTS WITH NON-ASBESTOS COMPRESSED SHEET GASKETS SUBJECTED TO INTERNAL PRESSURE.

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  • 内圧を受ける非石綿ガスケット付き箱型容器ボルト締結体の密封性能
  • ナイアツ オ ウケル ヒセキメン ガスケットツキ ハコガタ ヨウキ ボルト テイケツタイ ノ ミップウ セイノウ

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Abstract

Experimental leakage tests on a flexible box-shaped flange connection with a non-asbestos compressed sheet gasket subjected to internal pressure is carried out under several conditions using Helium gas. The amount of the gas leakage is measured by changing the initial clamping force, the cover material in the connection. The stress analyses are also performed using Finite Element Method (FEM) to simulate the leakage tests considering the hysteresis in the stress-strain curve of the gasket and it calculates the reduced contact gasket stress distributions in the connection due to the application of internal pressure, which dominates the leak tightness of the connection. Using the reduced contact gasket stress distributions and the measured amount of the gas leakage, the new gasket constants that can describe the sealing performance of the box-shaped flange connection are identified and the sealing performance is evaluated. In addition, the method estimating the amount of gas leakage using the new gasket constants is proposed. The sealing performance of the connection with the raised face is also examined by FEM and compared with the results with the flat face. Discussion is made on the effects of the initial clamping force, the cover material and the type of gasket facing on the sealing performance in the connection. It has been found the effect of the facing type becomes large. The sealing performance of the connection with the raised face gasket will be worse than that with the flat face gasket in case that the same average gasket stress is given. It has been also found that the effect of the cover material, the difference between aluminum alloy and carbon steel, is small on the sealing performance. The estimated amount of gas leakage is in a fairly good agreement with the measured one.

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