How to Dry Compressed Air

Shop, Garage and Tools

  1. dibbons

    dibbons FABO Gold Member FABO Gold Member

    Messages:
    4,073
    Likes Received:
    2277
    Joined:
    Nov 6, 2009
    Location:
    La Paz, B.C.S., Mexico
    Local Time:
    8:29 AM
    We open the drain located in the bottom of the tank of the Dewalt compressor all the time. However, when we want to dry something off with compressed air, we are still getting the parts all wet. What should we do, is there a water trap or filter recommended? This compressor is used in a body shop where my Formula S is being restored. I don't want to tell the owner what to do, but I don't want H2O mixed into my paint formula. Thank you.

    Dewalt.jpg
     
  2. krazykuda

    krazykuda Well-Known Member FABO Gold Member How-To Section Editor

    Messages:
    53,621
    Likes Received:
    18561
    Joined:
    Aug 20, 2007
    Location:
    Orland Park, IL
    Local Time:
    10:29 AM
    There are in-line driers that you can put on the hose before attaching your air gun etc....
     
  3. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

    Messages:
    43,465
    Likes Received:
    11017
    Joined:
    Oct 14, 2010
    Location:
    Idaho
    Local Time:
    8:29 AM
    There is only two ways I know of to dry air

    1....A dehumidifier, which is essentially a refrigeration unit which cools the air and condenses the moisture out and drains it off

    2....Chemical dryers IE "dessiccant" which of course the active material must be changed to keep it effective
     
    • Agree Agree x 2
    • Disagree Disagree x 1
    • Murray

      Murray FABO Gold Member FABO Gold Member

      Messages:
      1,773
      Likes Received:
      1172
      Joined:
      Apr 19, 2010
      Location:
      San Jose, California
      Local Time:
      8:29 AM
      Water in the line is OK for an air gun, but you don't want any water in line when painting. 100_2695.JPG There are in-line separators available. Also can use this little trick-see photo.
       
      • Like Like x 4
      • Agree Agree x 4
      • krazykuda

        krazykuda Well-Known Member FABO Gold Member How-To Section Editor

        Messages:
        53,621
        Likes Received:
        18561
        Joined:
        Aug 20, 2007
        Location:
        Orland Park, IL
        Local Time:
        10:29 AM
        Put your compressor in the clothes drier... Then turn on the drier, then the compressor....

        You will then have dry compressed air....
         
        • Like Like x 3
        • hemi446

          hemi446 Well-Known Member

          Messages:
          693
          Likes Received:
          217
          Joined:
          Aug 3, 2013
          Location:
          Ellicott City MD
          Local Time:
          11:29 AM
          Put a inline dryer for now but you may want a regular dryer unit. I have one on my big shop compressor plus an auto blow down valve that open every 20 mins for 3 seconds and that helps a lot. They are cheap compared to paint supplies about 60.00 plus some plumbing
           
        • zkx14

          zkx14 Duster De-ruster FABO Gold Member

          Messages:
          25,084
          Likes Received:
          19294
          Joined:
          Dec 23, 2012
          Location:
          South Central PA
          Local Time:
          11:29 AM
          Air going in makes a big difference. Hot, humid air from outside is going to drop out a lot more water. So if you can pull air from an air conditioned space it should help. If you can do tubes like above on wall in a cool space it should ring out a lot more water. Thats all a refrigerated drier Really is.
           
          • Like Like x 2
          • Agree Agree x 1
          • Mattax

            Mattax Just the facts, ma'am FABO Gold Member

            Messages:
            10,767
            Likes Received:
            6755
            Joined:
            Feb 7, 2013
            Location:
            Phila. Pa
            Local Time:
            11:29 AM
            • Agree Agree x 2
            • Like Like x 1
            • MoparMike1974

              MoparMike1974 FABO Gold Member FABO Gold Member

              Messages:
              2,417
              Likes Received:
              1710
              Joined:
              Jun 16, 2017
              Location:
              Maryland
              Local Time:
              11:29 AM
            • 67Dart273

              67Dart273 FABO Gold Member FABO Gold Member

              Messages:
              43,465
              Likes Received:
              11017
              Joined:
              Oct 14, 2010
              Location:
              Idaho
              Local Time:
              8:29 AM
              I don't know why in hell someone would disagree, this is pretty much correct. Anything that cools the air is also under the heading of dehumidification.

              Murry posted a photo of an elaborate trap. These help if they are cool enough. In a hot climate and a hot building, maybe not so much. YOU CAN also put a trap in a cooling bath like a garbage can or 55 gal drum, if you have the water to spare
               
            • harrisonm

              harrisonm Well-Known Member

              Messages:
              2,642
              Likes Received:
              2484
              Joined:
              Jan 16, 2005
              Location:
              Topeka, KS
              Local Time:
              4:29 PM
              I love this item. It holds a paper element that looks kind of like a roll of toilet paper. It works GREAT. I have three extra filters. They are easy to change. In the summer, I place the damp filter in the house where the AC helps it dry faster. They really do work well.
              www.tptools.com/1and2-Coalescing-Air-Filter,74.html?b=d*8081
              filter.jpg
               
              • Thanks! Thanks! x 2
              • Agree Agree x 1
              • BobW

                BobW Well-Known Member

                Messages:
                63
                Likes Received:
                45
                Joined:
                Jun 26, 2020
                Location:
                Central, FL 34705
                Local Time:
                11:29 AM
                When my old Craftsman compressor quit after 15 years or so I replaced it with a DeWalt as shown in the first post. I removed the compressor from the Craftsman tank and hooked the tank in series to the new DeWalt.
                Most of the moisture is in the DeWalt tank, like serious water, and just a little mist in the 2nd tank. I run a few drop leg drains throughout the shop.
                A cheap inline drier for the few time I spray anything.
                 
                • Like Like x 2
                • halifaxhops

                  halifaxhops It's going to get stupid around here! FABO Gold Member

                  Messages:
                  59,779
                  Likes Received:
                  28106
                  Joined:
                  Jan 20, 2014
                  Location:
                  CENTRURAL, PA
                  Local Time:
                  11:29 AM
                   
                • dodgedifferent2

                  dodgedifferent2 Well-Known Member

                  Messages:
                  2,526
                  Likes Received:
                  349
                  Joined:
                  Aug 8, 2008
                  Location:
                  southwestern, Ontario
                  Local Time:
                  10:29 AM
                  I use the up and down method but I added valves at the bottom so I can crack open the valve every now and then to let the water out.

                  I have 5 runs that go 15 feet high then go to a spare tank and I added an extra run up the wall before I connected to the shops air piping.

                  I have no faith in having to add dryer material or changing filters. I went from pressurized water to very dry air. When I paint I have a dryer on the pressure regulator.

                  Cheap and never have to buy crap.
                   
                  • Like Like x 1
                  • Agree Agree x 1
                  • YY1

                    YY1 Well-Known Member

                    Messages:
                    6,794
                    Likes Received:
                    2580
                    Joined:
                    Oct 11, 2011
                    Location:
                    FL
                    Local Time:
                    11:29 AM
                    I have a bowl separator on mine at the output of the tank.

                    I also have a long-ish run like pot #4 but not as many courses, basically just up about 6 feet, across the shop, and down.
                    MUCH harder for the water to travel up, and if it does make it, when it comes down the other end, put your air fitting ABOVE the bottom end of the pipe and put a drain valve at the bottom.

                    I take it one step further by having a dedicated outlet connector for my paint gun that also has a regulator and small HF desiccant filter.

                    Low buck all the way and works great.
                     
                  • MoparMike1974

                    MoparMike1974 FABO Gold Member FABO Gold Member

                    Messages:
                    2,417
                    Likes Received:
                    1710
                    Joined:
                    Jun 16, 2017
                    Location:
                    Maryland
                    Local Time:
                    11:29 AM
                  • Mr. Sinister

                    Mr. Sinister Devastation Manager

                    Messages:
                    1,062
                    Likes Received:
                    597
                    Joined:
                    Mar 3, 2017
                    Location:
                    Lenox, Mich.
                    Local Time:
                    10:29 AM
                    Sexy
                     
                    • Agree Agree x 1
                    1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                      By continuing to use this site, you are consenting to our use of cookies.