This paper presents results from analysis and testing of an NPS 20 CL600 ring-joint (RTJ) flange through assembly and a thermal cycle. Using a mock-up assembly, multiple gasket materials and types including conversion gaskets were tested to evaluate relative performance based on amount of bolt preload loss as measured through the use of load-indicating studs. To simulate field geometry, most tests included a spacer in the flange pair, which necessitated use of two (2) gaskets in the joint. ASME PCC-1-2010  Appendix O calculations and finite element analysis (FEA) were also performed for comparison with the test results and for evaluation of options to improve flanged joint performance. Testing and analysis results are discussed, and learnings are documented.
Analysis and Testing of a Ring-Joint Flange
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Hay, CA, & Brown, W. "Analysis and Testing of a Ring-Joint Flange." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Anaheim, California, USA. July 20–24, 2014. V003T03A020. ASME. https://doi.org/10.1115/PVP2014-28980
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