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Thread: Questions on Air Compressors for Winterizing

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    Sep 2015
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    Questions on Air Compressors for Winterizing

    Hi All,

    Noob here. I am sure this has been answered before but for some reason I can't find it; sorry!

    I am looking to purchase an air compressor to winterize my in ground pool. It is a basic 12x24 kidney shape design where the deep end is 6 feet not 8 feet. 1 skimmer, 2 deep end drains (normal Ma code) and 4 returns with a Polaris auto cleaner return. I have the basic knowledge how to winterize but need to know the basic air compressor specifications.

    I am looking for the proper specs required of an air compressor to blow out the lines and drain.


    I was looking at the Porter Cable 3.5 gallon that specs say has 3.5 scam @ 40 psi and 2.6 scfm @ 90 psi. Here is the one I'm looking at. http://www.homedepot.com/p/Porter-Ca...ct%7CNF%7C2day

    Also, I was looking at the Campbell Hausfield 6 gallon which has 3.5 scam @ 40 psi.http://www.walmart.com/ip/21283636?w...3552&veh=se em

    Also, looking at the Craftsman 6 gallon pancake http://www.sears.com/craftsman-6-gal...p-00916575000P

    I would appreciate your suggestions on what I need to be able to blow out the lines and which compressor ( or others) if you have any suggestions.

    I have read where some compressors could not keep up a constant cfm in order to properly blow out the returns and drain.

    Thank you,
    Doug

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    robdac's Avatar
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    Re: Questions on Air Compressors for Winterizing

    I have never winterized a pool so take this advice FWIW.

    At my previous home, I used to winterize the lawn sprinkler system with an air compressor every winter. The main thing is you need a very large volume of air. PSI is important but no where near as important as volume and that's measured in SCFM. I bought a DeWalt 15gal compressor rated for 5.4 SCFM at 90 psi. It was just barely able to handle the job. I had to charge the tank up fully to 210 psi and then connect the air to the sprinkler at a metered 60 psi right before I knew the compressor was about to shut off. The tank still ran to empty within a couple minutes. I repeated this twice on each of five zones. My point is that most non-commercial compressors are underrated for a job like this. You need enough pressure and volume that the air will push the water out in a column like it's a plug. What you do not want is the air traveling above the water in the pipe leaving some water to freeze in the line during the winter. That will happen if you don't have enough pressure and volume. The smallest compressor I saw any contractor use for the job was rated for and actually delivered 9 CFM at 90 psi.

    I think you're going to need a larger compressor with a larger tank.
    11K gal IG screened-in plaster pool w/ spa
    pentair 150 cartridge filter, Pentair Intelliflow VS pump,
    Aquarite AQR15 SWG, AquaCal Heatwave Heat Pump, TF-100 test kit

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    Catanzaro's Avatar
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    Jul 2014
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    Re: Questions on Air Compressors for Winterizing

    Attached are 3 threads that may help. It all depends on your equipment pad and where you plan on blowing the lines out from.

    Equipment to blow out lines and technique

    Please Help Closing IG Vinyl Lined Pool

    Modified Cover for Hayward Super Pump for Closing Swimming Pool
    14,700 gallons IG Pool Vinyl Liner - Octal Circulation System
    Hayward Pro-Series 350 LB. Sand Filter Model # S270T - 2" Plumping
    Hayward CL2002 Chlorinator - Hayward Super Pump 2 HP Model # k48m2n111
    Hayward AQR9 SWG 25K Salt Cell & TF-100 Test Kit + Speed Stir
    Gulfstream HE125RA - 117K BTU Heat Pump - Date of Build is 11-2013

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    shane4's Avatar
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    Re: Questions on Air Compressors for Winterizing

    I have a 45 litre (12gallon) 5 HP shop vac for quick clean ups (wet or dry) around the garage and shop. I change the vacuum hose from the intake port to the exhaust port of the vacuum. I hold the end of the hose to the pool's return line to the jets. Presto.......blows the water out like a whale's spout!
    16' x 32' IG, vinyl, 80k litre (21k gal), "lazy L" (kidney like at deep, squared off at shallow) shallow 3', deep 8', Hayward sand filter 300 lbs, 20gal/min Mod S-244T, Pentair Superflow VS 1.5 HP Model 342001, Raypak Heater 266K BTU Mod P-R266A-EN-C, 2 returns, 1 skimmer, 1 main drain, diving board, Southern Ontario (Canada) climate.

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    Re: Questions on Air Compressors for Winterizing

    Thanks you all for your responses and the links.

    Doug

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