Calculation of the natural cooling temperature of high-temperature media in instrument pipelines
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Dear experts, I would like to ask how to calculate the temperature of the medium in the instrument pipeline as it drops along its length. For example: if the temperature at the pressure tap is T0 = 300°C, the ambient temperature is 50°C, and the instrument pipeline has an OD of 3/8” with a wall thickness of 1.65 mm made of 316L material, then what will be the temperature of the fluid inside the pipe at a distance L (m) away? Thank you!
50 degrees, definitely, 0.5 meters behind the pressure tapping valve.
With the temperature so high, over 300 degrees, why does it drop to room temperature just 0.5 meters away? Is there a calculation method? Thank you!
This falls under the category of heat retention calculations; I’m not sure either. But practical experience tells me. Regenerated nitrogen at 300 degrees; the pressure gauge indicates normal temperature. Because the pressure guide tube is a blind tube; without flow of the medium, no heat is generated. Heat comes from the conduction and exchange of the medium, and this amount is small. Moreover, it is cooled by the ambient temperature.