Sweating on Line: High vs Low Pressure

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Sweating on a line occurs when high-pressure air (6.5 kg/cm2g) expands into a low-pressure environment (0.1 kg/cm2g), leading to a drop in temperature and condensation. This condensation happens because the air cools below the dew point due to the expansion process. In contrast, when air flows from high pressure to the atmosphere, the pressure difference may not create sufficient cooling to reach the dew point, preventing sweating. The key factor is the temperature drop during expansion, which is more pronounced in the transition to a significantly lower pressure. Understanding the specific conditions and dew point is crucial for addressing condensation issues.
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Why sweating on line occures when Air flow from high pressure(6.5kg/cm2g) to Low pressure(0.1kg/cm2g)?
Is this because of air expansion?
Then Why sweating not occur if Air flows from high pressur(6.5 kg/cm2g) to atmosphere?
 
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You need to describe the situation better. From the sounds of it, you are experiencing condensation on the outside of a pipe simply because of the expansion and resultant cooling of the media. If the cooling is below that day's dew point, you'll get condensation.

What is your situation exactly?
 

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