November 2001

Bonus Report: Instrumentation

Thermowell design and selection

A principal stress model is proposed as a basis for selection in high-velocity or corrosive services

Bertran, D. S., Kinsey, J. M., Meier, W. J., Patty, K. E., Phan, T. T., Yee, R., Monsanto Enviro-Chem Systems; Frikken, D. R., Solutia Inc.

Specifying the pressure rating and use of corrosion resistant materials is usually sufficient to guarantee mechanical integrity of thermowells. However, in high-velocity fluids, a more comprehensive basis for selection is needed.         Fig. 1. Cantilever coordinates for the continuous beam model. Current velocity rating tables are usually based on a nominal steam or condensate service to serve as a guide for thermowell selection. Murdock's stress model (1959) and its companion, the ASME Performance Tes

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