RTD Sensor, Thermocouple & Thermowell Technical Info
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Thermowell Design Evaluator

Based on calculations in accordance with ASME PTC 19.3 TW-2016

ASME PTC 19.3 TW-2016, the U.S. standard for evaluating the mechanical design of a thermowell used in a broad range of applications, was updated in 2010 to include a greater number of thermowell and process variables. Sometimes referred to as "Wake Frequency Calculation", the revision incorporates new elements for evaluating thermowell constructions that will reduce the chance of vibration and stress damage to the vessel, as well as avoid vibration damage to the temperature sensor it protects.

Please input data regarding your thermowell dimensions, thermowell properties and material/media/process properties in the designated spaces below. We will review the data, process the calculations and contact you with the results. Feel free to contact one of our Product Engineers to go through the process calculations.*

Unit of Measure:
Mounting Type:
Shank Profile:
Process Connection:
Unsupported Length (L): in
Bore Diameter (d): in
Root Diameter (A): in
Tip Diameter (B): in
Minimum Tip Thickness (t): in
HelpThe fillet radius (b) at root of thermowell shank can be as little as zero, depending on mounting method. Pyromation uses 0.178" for its standard catalog thermowell, as a conservative radius. Fillet Radius at Support Plane (b): in
HelpThe fillet radius (bs) at base of the reduced-diameter length of a step-shank thermowell can be as little as zero. Pyromation uses 0.125� for its standard catalog thermowell, as a conservative radius. Fillet Radius at Base of Step (bs): in
Reduced-Diameter Shank Length (Ls): in
HelpThe intrinsic damping factor, ζ, of common thermowells should be conservatively set at 0.0005. Values of ζ known from direct modal measurements should be used, although the designer is cautioned that the damping factor is not highly reproducible among multiple thermowells of similar design and may depend on details of the thermowell mounting, such as gasket choice for flanged thermowells. Damping Factor (ζ):
HelpThe shielded length (Lo) is the portion of the thermowell that is protected (shielded) from the process flow. Shielded Length of T-Well (Lo): in
Max. Fluid Velocity (V): ft/s
Fluid Density (ρ) lb/ft^3
Max. Operating Temperature (T): F
Max. Operating Pressure (P): psig
Dynamic Viscosity (μ): cP (1 centipoise = 1 mPa*s)
Tag/Reference #:

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* Pyromation makes no claims regarding performance or safety based on the calculations provided. The results communicated are based on the ASME PTC 19.3 TW-2010 design standard for reliable service of tapered, straight and stepped-shank thermowells in a broad range of applications. The user assumes full responsibility for installation, application and operation of the product.

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