New ScrutonWell � design for thermowells

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 recommended 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 even to raise the root and tip diameter, accepting a longer response time of the thermometer.
The brand new ScrutonWell � design reduces the amplitude of oscillation by a lot more than 90 % and allows an easy and fast installation of 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 form behind the thermowell stem when it is put through a flow inside a pipeline. This vortex street consists of two rows of vortices with opposite directions of rotation, which detach themselves left and the right of the thermowell out of phase, which can instigate the thermowell to vibrate.
NEW ScrutonWell � design
The helical strakes, arranged round the thermowell stem of the ScrutonWell � design, split up the flow and thus 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.
ไดอะแฟรม ScrutonWell � design can be utilized for all kind of solid machined thermowells with flange connection, in Vanstone design or for weld-in or screwed process connection.
Note
Further information on our thermowells are available on the WIKA website.
Learn more about the brand new ScrutonWell� design in the following video: