Wake frequency calculations are critical engineering assessments performed to evaluate vortex shedding effects on thermowells in flowing process conditions. In accordance with ASME PTC 19.3 standards, this analysis determines whether a thermowell installed in liquid or gas service is at risk of resonance-induced fatigue failure. When process fluid flows past a thermowell, alternating vortices form downstream, generating cyclic forces that can excite the thermowell at specific frequencies. Without proper evaluation, these oscillations may lead to mechanical stress, cracking, or catastrophic failure.
At Acez, our engineering team performs detailed thermowell wake frequency analysis using project-specific operational data to ensure mechanical integrity and long-term reliability.
Flow Parameter Assessment – Input of flow velocity, fluid density, viscosity, and pipe internal diameter.
Thermowell Design Evaluation – Review of insertion length, root diameter, tip diameter, material grade, and mounting configuration.
Natural Frequency Calculation – Determination of the thermowell’s structural frequency characteristics.
Vortex Shedding Frequency Analysis – Identification of excitation frequencies generated by process flow.
Stress & Fatigue Assessment – Evaluation of dynamic stress levels to ensure compliance with allowable limits under ASME PTC 19.3.
Compliance Documentation – Technical reporting to support engineering approval and regulatory requirements.
This analysis is essential because if the vortex shedding frequency matches the thermowell’s natural frequency, resonance occurs. Resonance can rapidly accelerate fatigue damage, potentially resulting in instrument failure, safety hazards, plant shutdowns, and costly environmental incidents.
Wake frequency calculations are particularly important for high-velocity process lines, large pipe diameters, steam service, long insertion lengths, and critical process applications. Many industries require documented compliance with ASME thermowell design standards before installation.
Protect your plant, personnel, and process integrity with professional wake frequency verification. Contact Acez today to ensure your thermowell design meets ASME standards and operates safely under real-world conditions.
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