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Thermowell Wake Frequency Calculation as per ASME PTC 19.3

Thermowells are essential components in temperature measurement applications, providing a protective barrier between the sensing element and the process fluid. However, thermowells can be susceptible to vibration-induced failure due to fluid flow, which can lead to inaccurate temperature readings and even sensor damage. To mitigate this risk, the American Society of Mechanical Engineers (ASME) provides guidelines for calculating the wake frequency of thermowells in ASME PTC 19.3.

Understanding Wake Frequency

Wake frequency refers to the frequency at which vortices shed from the thermowell, creating alternating pressure fluctuations that can cause vibration. Accurate calculation of wake frequency is crucial to ensure the thermowell's natural frequency does not coincide with the wake frequency, avoiding resonance and potential failure.

ASME PTC 19.3 Calculation Method

The ASME PTC 19.3 standard provides a step-by-step approach to calculate the wake frequency of thermowells:

1. Determine the fluid properties: Obtain the fluid's density (ρ) and velocity (V).
2. Calculate the Reynolds number (Re): Using the thermowell's outside diameter (D) and the fluid's kinematic viscosity (ν), calculate Re = ρVD/ν.
3. Determine the Strouhal number (St): Based on the Reynolds number, obtain the Strouhal number from the ASME PTC 19.3 graph or equation.
4. Calculate the wake frequency (fw): Using the Strouhal number and fluid velocity,

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