Wake frequencies are developed by a person (often a thermopile engineer) to find the calculated estimate. This usually involves taking readings of internal and external temperatures and sensors and calculating the frequency using application note PTC-19.3. The calculated result can be compared to the ASME PTC-19.3-2016 standard.

The goal is to meet the mechanical tolerance specification based on the calculated result. The specification most commonly imposed on the mechanical tolerance of the thermowell is the allowable stress differential or error divided by the length of the thermowell.

The calculation does not consider the thermal factor of the thermopile. This means that the temperature range where the thermopile is working does not enter the calculations and therefore the internal temperatures and the temperature difference between internal and external temperature are not used.

The wake frequency calculation is used in three cases:

Determination of the critical temperature
Determination of a critical length or structural length
Determination of a maximum length

Comparison with ASME PTC 19.3

The ASME PTC-19.3-2016 thermowell calculation is done on the basis of the equation:

Where denotes steady state response .

The equation above is correct as far as the calculation of the critical length and structural length is concerned but it is not so, if temperature is to be considered. ASME PTC 19.3-2016 does not consider temperature dependency and so the relevant equation is:

Temperature dependency is considered when determining the critical length or the critical structural length. The last equation above implies that only and variables can be used in the calculation. Temperature changes can be ignored as they are not considered in the equation.

Another important element of ASME PTC 19.3 is to consider the thermal factor of the thermopile. This means that the internal temperature can be different from the external temperature. ASME PTC-19.3 is based on the equation:

There are other elements that can affect the ASME PTC 19.3-2016, that are:
Specification of the length of the thermowell in relation to the length of the bar stock (dimension)
Specification of the length of the thermowell in relation to the external temperature (temperature gradient)
Specification of the length of the thermowell in relation to the length of the thermopile (thermopile length)
Specification of the length of the thermowell http://uttaranchalcollege.com/wp-content/uploads/2022/06/jandore.pdf

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