Thermowell

Your pipe is 4000mm in diameter? or is that length?

Usually, you'd want to have the tip of your thermowell at the center of your pipe. Also, it is advisable to have the thermowell inserted at an angle towards the upstream direction.

That's a big pipe, by the way.

There are a couple things that you should know:

1. The generally used guideline for immersion in a pipeline is to ensure that the sensitive area is in the center third of the line but no less than 2" into the flowing stream for the full temperature sensitive length.

2. You must check that the thermowell will not fail due to flow induced stress or flow induced vibration. There are resources on the web that can explain these in detail. Search for thermowell strength calculations.

As per ASME PTC 19.3,basic guideline is

Fw/Fn should be less than 0.75, if the ratio exceeds 0.75 decrease, U

Fw& Fn depends on flow/operatng temp and pressure ,density and sp volume of material

Some users tend to use the limit value to be 0.8

Fw---wake frewuency

Fn -----natural frequency

U---THE IMMERSION LENGTH,

Regards

Jose John