Sweating on Line: High vs Low Pressure

[cyclone]

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?

 

[FredGarvin]

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?

 

[sir-pinski]

Sweating on a line occurs when there is a significant difference in pressure between the inside and outside of the line. This is because air naturally moves from areas of high pressure to areas of low pressure, and this movement of air causes a change in temperature. When air flows from a high pressure (6.5 kg/cm2g) to a low pressure (0.1 kg/cm2g), it expands and cools down. This sudden change in temperature causes the moisture in the air to condense and form droplets on the surface of the line, resulting in sweating.

However, if the air flows from a high pressure (6.5 kg/cm2g) to the atmosphere, there is no significant difference in pressure, and the air does not expand and cool down as much. Therefore, there is no sudden change in temperature and no condensation occurs, which means there is no sweating on the line.

In summary, sweating on a line occurs due to the expansion and cooling of air when it flows from a high pressure to a low pressure. This phenomenon is not observed when the air flows from a high pressure to the atmosphere because there is no significant change in pressure and temperature.