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In เกจวัดแรงดัน 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 the event of a calculation with negative results, the only real constructive solution so far was to shorten the thermowell stem or even to raise the root and tip diameter, accepting a longer response time of the thermometer.
The new ScrutonWell � design reduces the amplitude of oscillation by a lot more than 90 % and allows an easy and fast installing 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 selection of industrial applications to effectively suppress vortex-induced shrinkage excitation.
Functional principle
Standard thermowell
In certain flow conditions, a K�rm�n vortex street can develop behind the thermowell stem when it is put through a flow within a pipeline. This vortex street consists of 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, split 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 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 next video: