What is Van Stone Thermowell?

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:

  1. Any weld stress is eliminated.
  2. 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
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