Complete a thermowell vortex-induced vibration (VIV) assessment in minutes — covering Strouhal wake frequency, natural frequency of the cantilever, frequency-ratio curves with resonance bands, and a clear ASME PTC 19.3 TW-2016 PASS/FAIL verdict with a printable PDF engineering report.
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Thermowell wake frequency checks are mandatory before any well goes into service — yet they remain one of the most commonly skipped steps in instrumentation engineering. A thermowell that fails in a resonant vortex-shedding condition can crack, leak and endanger personnel in hours. This calculator follows ASME PTC 19.3 TW-2016 from start to finish and delivers a defensible PASS/FAIL result instantly.
Full implementation of the ASME wake frequency evaluation method, including Strouhal number selection across three Reynolds-number regimes, fluid added-mass correction, and the cantilever-beam natural frequency formula with the 1.875 first-mode eigenvalue.
Calculates wake (shedding) frequency, lift-direction and drag-direction natural frequencies, then applies the ±30% resonance-band rule with lock-in detection — exactly as the code requires.
Five frequency-ratio curves plotted on one interactive chart, with shaded resonance bands and a FAIL marker at the operating point — so you see the margin (or lack of it) at a glance.
Carbon steel, stainless steels (304/316/321/347/310/317), duplex (2205/2507), nickel alloys (625/825/C276), titanium, copper alloys, Hastelloy and more — or enter custom elastic modulus and density.
Results update as you type — change a dimension, velocity or material and the PASS/FAIL verdict, frequency ratios and curve shift instantly, no button to press.
One-click engineering report with all inputs, frequency data, PASS/FAIL verdict and frequency-ratio plot — ready to attach to the thermowell data sheet or instrument specification.
From raw process data to an ASME-compliant PASS/FAIL result in four steps.
Input the bore diameter, tip diameter, root diameter, insertion length, and support configuration. Metric or imperial — switch anytime.
Enter fluid velocity (or flow rate & pipe size), density, viscosity, pressure and temperature. The tool handles gas, liquid and steam.
Pick from 22 built-in materials or enter custom properties. The calculator instantly reports wake frequency, natural frequency, frequency ratios and the PASS/FAIL verdict.
Inspect the frequency-ratio chart with shaded resonance bands, then export a PDF report for the instrument data sheet or project file.
The full interactive tool — ASME PTC 19.3 TW-2016 wake frequency, natural frequency, frequency-ratio curves and PASS/FAIL check with PDF report — runs in your browser on the FLOWKS engineering platform.
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