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 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 to increase the root and tip diameter, accepting a longer response time of the thermometer.
pressure gauge ScrutonWell ï¿½ design reduces the amplitude of oscillation by more than 90 % and allows a straightforward and fast installation of the thermowell without support collar, and therefore without expensive and time-consuming rework on site.
This helical design has been used successfully for decades in a wide variety of industrial applications to effectively suppress vortex-induced shrinkage excitation.
In certain flow conditions, a Kï¿½rmï¿½n vortex street can form behind the thermowell stem when it is subjected to a flow within 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, and this can instigate the thermowell to vibrate.
NEW ScrutonWell ï¿½ design
The helical strakes, arranged round the thermowell stem of the ScrutonWell ï¿½ design, break up the flow and therefore impede the formation of a clearly defined Kï¿½rmï¿½n vortex street. Through the reduced amplitudes of the diffused vortices, vibrational excitation of the thermowell is avoided.
THE BRAND NEW ScrutonWell ï¿½ design can be utilized for all sort of solid machined thermowells with flange connection, in Vanstone design or for weld-in or screwed process connection.
Further information on our thermowells are available on the WIKA website.
Learn more about the brand new ScrutonWellï¿½ design in the next video: