Mac-Weld Helical Vortex, Threaded, Socket-Weld, Flange, Vanstone Thermowells

Mac-Weld Helical Thermowells, featuring VE Technology, are created to outperform the standard thermowell in high velocity services. Standard thermowells exposed to high velocity flows often fail requirements of ASME PTC-19.3, but vortex-induced vibrations (VIV) are not an issue for helical thermowells. The strakes reduce the amplitude of oscillation as compared to plain cylindrically shaped thermowells. The sharp edges of the three helical strakes separate the flow, and the helical shape redistributes the vortices. As a result, the lift and the drag forces are greatly minimized. With helical strakes, accuracy and response time of temperature measurement is greatly improved as compared to standard thermowells with increased root-tip diameters and shortened immersion length.