Fabricated Thermowells are manufactured from tubes which are sealed by a solid welded tip at the process. It means that the stem of thermowell is manufactured from tube and tip is made separately, than both these parts are welded by utilizing suitable welding process.
The flange is also joined to this assembly by welding process. Fabricated Thermowells are generally recommended for low to medium process loads. Connection to the pipe or vessel may be done by means of thread, flange or weld.
Standard threads used in fabricated thermowell are NPT, BSP (Pl), BSP (Tr), API & metric thread. The thread size is dependent on the application.
Standard sizes range from 1/8” to 2”. For applications where a quick response to changes in temperature is required, fabricated pockets may be fitted with a reduced tip.