A simplified model of a pipe mounted thermowell provides a measure of insight into the design and application of intrusive pipe fittings. A combination of Fourier and Green’s function methods together with a distributed load model of the thermowell/pipe wall interface are used to calculate the support compliance and subsequently the natural frequencies of the thermowell. These are compared with limited though independent calculations. This comparison confirms a profound reduction in natural frequencies for commonly encountered thermowell installations, reductions that should not be ignored where the risk of flow-induced resonance is high.
Support Flexibility and Natural Frequencies of Pipe Mounted Thermowells
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 5, 2014; final manuscript received October 17, 2014; published online February 20, 2015. Assoc. Editor: Chong-Shien Tsai.
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Bartran, D. S. (August 1, 2015). "Support Flexibility and Natural Frequencies of Pipe Mounted Thermowells." ASME. J. Pressure Vessel Technol. August 2015; 137(4): 041201. https://doi.org/10.1115/1.4028863
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