Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - has any one used pvs pipes for air supply
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Old 08-31-2011, 11:24 AM
oldred oldred is offline
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Originally Posted by shine
you cool and remove moisture BEFORE you send it through the lines. using copper is not going to solve a water problem nor will plastic create one.

Shine again you have me puzzled? How are you cooling your air at the compressor? Copper is the very best way to cool the air and remove moisture and PVC is a terrible choice for that purpose. Assuming a person does not have a cooler of some sort located between the compressor tank and the supply line then the line itself from the tank to the water separator is expected to serve as the condenser for the water vapor, that's the reason 50' of pipe is the recommended minimum. Basically what the pipe does is cool the hot air as it exits the compressor tank, hot air will contain the moisture as a vapor which will pass right through a water separator. The idea is to cool the air by using the metal pipe walls to radiate off the heat therefore causing the water vapor to condense and collect on the cooler pipe walls so that the separator can remove it, this is why a water separator does not do much good if it is mounted close to the compressor tank. Pipe does not "sweat" as is commonly said but the water is condensed out of the air when the heat is radiated off and the water vapor turns into liquid which is what you want it to do. Once the water has condensed into liquid and collected on the pipe walls it can be drained off into "drops" or collection points where it can be later drained out of the system, likewise the water that is still in the air flow will now be condensed into liquid droplets that can be more easily collected in the separator. Nothing much like this happens when using PVC, the PVC is very inefficient at removing the heat so the air will stay hotter and more of the moisture will remain in vapor form to pass through the separator and into your air lines. Once this vapor is past the separator some of it will condense in the air line and exit into your tools as liquid water while some of it will condense as the air cools from expansion upon exiting the hose. So yes Copper vs PVC can and does make a profound difference in the amount of water that can be easily removed from an air system before the air reaches the tool being used., this is not just opinion but a well known engineering fact.

Last edited by oldred; 08-31-2011 at 11:30 AM.
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