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I'm preparing a Hookup design of pressure transmitters for steam application. I checked my previous project standards and some required condensate pot only for steam more than 30bar (400degC) to protect pressure sensor with a design of 80degC max allowable temp. I checked some Steam Turbine generator (STG) and Boiler vendor's hook-ups but they not at all recommend to use condensate pot (even for high pressure steam as high as 140bar).
Now, I am more convinced that condensate pot is not necessary for pressure transmitters because of the temperature gradient effect, rule of thumb 1degC/mm at steady state (zero flow). So, if my sensor temp rating is only 80degC, using the rule of thumb, I can tap it to steam line as high as 600degC with minimum 520mm of non-insulated stainless tubing to get a temp drop of 520degC before the sensor.
Appreciate if anyone can share his/her thoughts on my understanding.
Thanks
Now, I am more convinced that condensate pot is not necessary for pressure transmitters because of the temperature gradient effect, rule of thumb 1degC/mm at steady state (zero flow). So, if my sensor temp rating is only 80degC, using the rule of thumb, I can tap it to steam line as high as 600degC with minimum 520mm of non-insulated stainless tubing to get a temp drop of 520degC before the sensor.
Appreciate if anyone can share his/her thoughts on my understanding.
Thanks