Industry practice dictates that there is a minimum level of assembly stress to obtain gasketed joint tightness. In addition to the initial stress placed upon the gasket, it is maintained that a re-torque is often necessary with PTFE based gaskets to insure proper operating stress levels on the joint and gasket material system. This paper and research will explore the effect of bolt loading and flange assembly rate in bolted flanged connections utilizing PTFE gaskets.
Initial Investigation on the Effect of Bolt Loading Rate on the Need to Re-Torque PTFE Gaskets in Bolted Flanged Connections
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Clarke, MM, Grant, KR, & Waterland, AF(, III. "Initial Investigation on the Effect of Bolt Loading Rate on the Need to Re-Torque PTFE Gaskets in Bolted Flanged Connections." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 2: Computer Technology and Bolted Joints. Boston, Massachusetts, USA. July 19–23, 2015. V002T02A004. ASME. https://doi.org/10.1115/PVP2015-45756
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