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Posts Tagged ‘ASME PTC 19.3’

Reducing Thermowell Dynamic Stress Forces

Posted in Temperature on Friday, April 27th, 2018. No comments yet
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Thermowells are traditionally a circular cylinder installed into the piping to protect the temperature sensors from the flow. From an Emerson whitepaper, Thermowell Calculations: As a process fluid passes around the thermowell, low pressure vortices are created on the downstream side in laminar, turbulent, and transitional flow. The combination of stresses, generated by the static […]

Resources for Thermowell Selection and Design

Posted in Temperature on Thursday, April 9th, 2015. No comments yet
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Measuring and controlling temperature can the most important parameter in many production processes. It’s not only the temperature sensors that are important, but how they are protected by thermowells. Wikipedia has a good definition of what thermowells are: Thermowells are tubular fittings used to protect temperature sensors installed in industrial processes. A thermowell consists of […]

Online Calculation Tool for Thermowell Installations

Posted in Regulatory Compliance, Temperature on Tuesday, January 29th, 2013. 8 comments so far
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Back in 1974, the ASME (founded as the American Society of Mechanical Engineers) published a performance technology standard for thermowell calculations as well as overall temperature measurement best practices, PTC 19.3. Based on decades of industry and research data, the updated PTC 19.3 TW-2010: …incorporates the latest theory in the areas of natural frequency, Strouhal […]

Velocity Collars are Not the Answer to Thermowell Resonance

Posted in Measurement, Plant Equipment on Wednesday, March 16th, 2011. 4 comments so far
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A few weeks ago, I highlighted the issue of resonance and thermowells in a post, New Thermowell Calculations Help Avoid Damaging Resonance. Thermowells are the circular cylinder installed like a cantilever into process piping. The temperature sensor goes into the thermowell, to be able to measure the temperature of the fluid in the pipe without […]

New Thermowell Calculations Help Avoid Damaging Resonance

Posted in Measurement, Plant Equipment on Monday, February 21st, 2011. 5 comments so far
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Last week, I visited our Emerson division that makes the Rosemount brand family of instrumentation. One of the things I learned coming out of those meetings was a new release of thermowell design standards. For those not already familiar with a thermowell, it’s essentially a circular cylinder installed like a cantilever into process piping. The […]