It is advisable to use full penetration welds for flanged thermowells to achieve the highest fatigue strength rating. Forged thermowells accomplish the same goal without welds, but at a much higher cost. Van Stone style thermowells accomplish this without the cost.
Van Stone thermowells are machined from solid bar and are connected using a separate and reusable backing flange. Van Stone thermowells mounted between mating flanges for process insertion.
Van Stone Thermowell
This design offers two advantages:
- Any weld stress is eliminated.
- The slip on flange not being exposed to the process conditions can be of a less expensive material.
- Chemical, process, apparatus and plantengineering; petrochemical; on/offshore
- High chemical loads
- High process loads