Process Manufacturing

Online thermowell calculation tool

Emerson Process Management launches free online thermowell design calculator that incorporates the new ASME PTC 19.3 standard.

January 28, 2013

Emerson Process Management has introduced an online Thermowell Calculation Tool that incorporates the new ASME PTC 19.3 TW standard. The proprietary tool is now available online free-of-charge. Emerson says it wants to provide a more automated approach as opposed to the traditional way of utilizing spreadsheets.

“The new tool offers preliminary calculations and allows users the option to perform a quick pass or fail thermowell calculation,” says Danjin Zulic, temperature marketing engineer, Emerson Process Management. “Users can save time by performing iterative, preliminary calculations to select the right thermowell earlier in the design process.”

In addition to having the tool, the web site has a link to an R21 Report request form for official evaluations. “Once the thermowell order is ready to be placed, the official R21 report provides detailed, industry-leading documentation of the thermowell calculation,” Zulic adds.

Emerson Process Management created this video  to explain the new ASME PTC 19.3 TW standard. The old 1974 standard was limited in scope and overly simplistic which led to significant variances in thermowell calculations. Enhancements in the new standards and thermowell calculation tool include different types of stem profiles, more accurate natural frequency equations, and a calculated Strouhal number. The new standard also provides natural frequency correction factors that take into account different components of the thermowell such as the mounting style and temperature sensor mass. Emerson Process Management has a whitepaper available on the topic.

Edited by Peter Welander,