Technical Brief: Technical Briefs

The Drag Crisis and Thermowell Design

[+] Author and Article Information
Dave Bartran

e-mail: dbartran@primary.net

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received January 1, 2018; final manuscript received March 31, 2018; published online May 10, 2018. Assoc. Editor: Tomomichi Nakamura.

J. Pressure Vessel Technol 140(4), 044501 (May 10, 2018) (3 pages) Paper No: PVT-18-1002; doi: 10.1115/1.4039882 History: Received January 01, 2018; Revised March 31, 2018

Documented thermowell failures designed to PTC 19.3TW and earlier, when evaluated with the drag crisis invoked, reveals the potential for enhanced reliability of the current standard in reducing the risk of failure. The code calculation remains largely intact apart from a conservative Strouhal number in conjunction with Reynolds number criteria marking the onset and terminus of the drag crisis.

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Grahic Jump Location
Fig. 1

Apparent Strouhal No. of the reported failures [17], based on the maximum fluid velocity, tip diameter, and the fluid properties, with representative Strouhal variations [10,11,18,19] for comparison.

Grahic Jump Location
Fig. 2

With the drag crisis included it is clear why this design lasted less than 100 h in service, as might be expected

Grahic Jump Location
Fig. 3

Flow-induced resonance is very likely during startup and normal operation when the drag crisis is included, while the rating according to [10], without increased Strouhal number, is nearly double the maximum flow capacity of the pumps



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