Calculation of thermowells in temperature measurement
In temperature measuring devices, thermowells form the interface between the sensing element and the process. They protect the actual probe while they themselves are exposed to thermal, chemical and mechanical stresses.
For the safe operation of temperature measurements with thermowells, the following must be observed:
Thermowells are placed in a state of spatial stress by static pressure. Bending and shear stresses are added when flow is applied.
Behind flow-loaded thermowells, vortices are periodically detached. However, this effect, which is required for vortex flow meters, also leads to undesired oscillations of the thermowell and thus to its destruction if the frequency of the vortices does not deviate significantly from the resonant frequency of the thermowell.
For strength calculations, all stresses are combined into one equivalent stress, which should have a safety factor > 1.7 with respect to the hot yield strength or the creep strength of the material.
The risk of a thermowell failure can be significantly reduced by calculating the stresses prior to design.
Products
OPTITEMP TRA-H61
Resistance (RTD) temperature assembly for hygienic applications
OPTITEMP TRA-H65
Resistance (RTD) temperature assembly for hygienic applications
OPTITEMP TRA-F13
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-F23
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-F42
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-G10
Resistance (RTD) temperature assembly for surface temperature measurement in industrial applications
OPTITEMP TRA-G20
Resistance (RTD) temperature assembly for surface temperature measurement on double-walled pipes or similar applications
OPTITEMP TRA-H10
Resistance (RTD) temperature assembly for hygienic applications
OPTITEMP TRA-H20
Resistance (RTD) temperature assembly for hygienic applications
OPTITEMP TRA-H30
Resistance (RTD) temperature assembly for hygienic applications
OPTITEMP TRA-P10
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-P14
Resistance (RTD) temperature assembly for standard applications or use in existing thermowells
OPTITEMP TRA-P20
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-P40
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-S11
Resistance (RTD) temperature assembly for lower temperature applications
OPTITEMP TRA-S12
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-S21
Resistance (RTD) temperature assembly for lower temperature applications
OPTITEMP TRA-S22
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-S34
Resistance (RTD) temperature assembly for use in existing thermowells or machinery
OPTITEMP TRA-S41
Resistance (RTD) temperature assembly for standard applications
OPTITEMP TRA-S50
Resistance (RTD) temperature assembly for use in existing thermowells or machinery
OPTITEMP TRA-T30
Resistance (RTD) temperature assembly for higher flow velocities and pressures
OPTITEMP TRA-TF31
Resistance (RTD) temperature assembly for higher flow velocities and pressures
OPTITEMP TRA-TF33
Resistance (RTD) temperature assembly for higher flow velocities and pressures
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