What size Thermowell is Appropriate for a Application?

Based on the design of your system you need to know:

  1. Operating temperature (°C)
  2. Operating pressure (bar), Specific volume (m3/kg)
  3. Velocity (m/s)

Once those are established then you’re ready to consult ASME standard PTC 19.3 TW-2010 Thermowell section, which goes through the calculation for the design of the well.