In order in order to avoid any damage to the thermowell during operation because of mechanical loads, a thermowell calculation per ASME PTC 19.3 TW-2016 is preferred for critical process conditions. In case of a calculation with negative results, the only constructive solution up to now was to shorten the thermowell stem or to raise the root and tip diameter, accepting an extended response time of the thermometer.
Sneak-peek ScrutonWell � design reduces the amplitude of oscillation by more than 90 % and allows a straightforward and fast installing the thermowell without support collar, and thus without expensive and time-consuming rework on site.
This helical design has been used successfully for decades in a wide selection of industrial applications to effectively suppress vortex-induced shrinkage excitation.
Functional principle
Standard thermowell
Using flow conditions, a K�rm�n vortex street can develop behind the thermowell stem when it’s put through a flow inside a pipeline. This vortex street includes two rows of vortices with opposite directions of rotation, which detach themselves to the left and the proper of the thermowell out of phase, and this can instigate the thermowell to vibrate.
NEW ScrutonWell � design
The helical strakes, arranged around the thermowell stem of the ScrutonWell � design, break up the flow and therefore impede the formation of a clearly defined K�rm�n vortex street. Through the reduced amplitudes of the diffused vortices, vibrational excitation of the thermowell is avoided.
THE BRAND NEW ScrutonWell � design can be used for all kind of solid machined thermowells with flange connection, in Vanstone design or for weld-in or screwed process connection.
Note
More info on our thermowells are available on the WIKA website.
Learn more about the brand new ScrutonWell� design in the following video:g