Could someone help me understand more about Thermowell,
1: why minimum pipe is DN100 for Thermowell?
2: is there any spec saying the length of Thermowell for tank?
3: how to caculate it, stress? frequency? any software there?
Thanks in advance
Different installation methods permit some variation in the minimum line size etc. Also, the pipin connection such as flanged is normal for me but other ndustries may have other options. You could install the TW in a line smaller than NPS 4 in an elbow. Where practical piping could change from NPS 2 to larger pipe just for the TW if practical. Some clients permit TW style installations (sample probes) at NPS 3 for flanged connections. Such probes are a TW with the end cutoff.
I think that the new calc is LOTS more conservative than previous.
may still have a simple code available, don't know if it is up to date with the new thermowell standard, though the natural frequency calculation appears to be very good for none standard designs