Conditioning Compressed Air?

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Forum topic by Halfday posted 02-17-2019 05:15 AM 465 views 0 times favorited 3 replies Add to Favorites Watch
View Halfday's profile


8 posts in 3245 days

02-17-2019 05:15 AM

Today I ordered what should be my last shop air compressor – a Quincy 60 gallon, two-stage, 15+ CFM, 175 tank PSI, sporting a 100% duty cycle. I selected that unit not so much for my wood shop, but because my first project with it will involve a considerable amount of sandblasting. Upon discharge from the tank the air will immediately enter a particulate filter and regulator, and then through 35 or 40 zig-zagged feet of Type L, hard, copper tubing on my wall to cool and transform the water vapor into droplets for easy removal by the water trap. NOW FOR MY QUESTION. Given the large volume of air that will be consumed by the sandblaster pressure pot, should 1/2 inch copper be sufficient for the cooling zig-zag, or should I bump up 3/4 inch? (3/4” almost 2 x $$$). Your thoughts please.

3 replies so far

View wuddoc's profile


342 posts in 4050 days

#1 posted 02-17-2019 05:29 AM

Atlas Copco has a online brochure that may answer your question.

-- Wuddoc

View wingless's profile


31 posts in 74 days

#2 posted 02-17-2019 09:55 AM

When I setup my air compressor system, I also added a refrigerated cooler to condense / remove water vapor from the air. That worked great, changing the air from spraying drops to no water observed. The cooler also has an automatic / periodic purge drain trap.

The system also included a tank drain on a timer, that automatically dumped air out the bottom on an adjustable interval / adjustable duration. That system beat the heck out of manual remembering / forgetting / neglecting the tank drain.

View therealSteveN's profile


2383 posts in 906 days

#3 posted 02-17-2019 10:42 AM

Imperial and Metric calculators to help you figure pressure drop.

This may help figure your moisture, and if it's going to be a problem if you just use a trap filter, or a simple fix.

Know that a lot of home shops have nothing except a hose attached to the compressor, IE: no filtration at all, and they get very nice finishes. A guy painting Ferrari’s for a living probably has a pretty complex set up. Who’s right?

FWIW I would say go 1/2” if you do that, but for the sandblasting. I would just move it closer to the compressor, and see how that works out, just using the air line direct to the compressor. I think you’ll find your medium stays pretty dry.

-- Think safe, be safe

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