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Old 10-01-2016, 04:05 PM   #1
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OK to use a tank type compressor to winterize?

Thinking about doing my own winterization this year but have read not to use a compressor with a tank. They said it could introduce oil to my water system? I have a standard 2 gal air compressor in my garage I had planned on using. So, for all you do it yourselfers, what type of air compressor do you use?

TeJay, you out there?
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Old 10-01-2016, 04:12 PM   #2
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I am a do-it-yourself guy, but I only use the pink liquid
antifreeze for my fresh water system. Been doing this for
30 years in boats and motorhome. Never had a problem.
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Old 10-01-2016, 04:37 PM   #3
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I use a tank type. There is minimal chance of any oil getting in the water unless it's a really old and wore out compressor. I blow mine out and then pump the antifreeze in.
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Old 10-01-2016, 04:38 PM   #4
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I guess it's possible for a leaky air compressor to spray some oil in along with the air. Mine is a Porter-Cable oil-less compressor, so I've not had to be concerned. It's one of those things that probably won't happen, but if it did, it's a disaster. It's very, very hard to get the oily residue out once its gets in the plumbing.

They sell oil & water separators for oil-type compressors. About $12-$15 at places like Lowes and Harbor Freight. Better safe than sorry, I think.

Note that its the design of the compressor pump, not the use of a tank, that introduces oil [or not].
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Old 10-01-2016, 08:52 PM   #5
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Turn the pressure on the compressor below 50psi or you can break something. Use antifreeze or you will be sorry you didn't spend the few dollars
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Old 10-02-2016, 07:22 AM   #6
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Not a bad idea to drain your compressor tank either.

I just drained mine the other day and there was quite a bit of rusty water in there.
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Old 10-02-2016, 07:48 AM   #7
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Not a bad idea to drain your compressor tank either.

I just drained mine the other day and there was quite a bit of rusty water in there.
There is always water when you compress air. That water will contain oil, dirt, mold and bacteria. Low priced water separators will not trap all of the contaminants, so be sure to sanitize and flush the system well, before use, if you use the filthy compressed air method.
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Old 10-02-2016, 09:04 AM   #8
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So you think compressed air you breath when compressed has more crap in it than the few thousand breathing cycles. You think the grease you clean in the kitchen off the kitchen range does not enter the air you breathe. Yet you worry about molds, dirt, oil and bacteria you compress from that same air.
These are for the most part oilless compressors and IF a drip of oil gets into your system you think it's more than is in your water supply you are filling your tank with to go camping. The big water pumps have oil in them.
I have been winterizing with air for forty years, my first A had an air compressor to presurize, deliver the on board water.
Blow out the system with lots of under 60 lb air, opening each valve a number of times. With the hot water tank drained first. Don't forget the outside shower and black tank washout. Then put a small amount of the pink in the traps, wash machine, toilet and a bit to protect the dump valves.
Then when dewinterizing do a sanitizing.

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Old 10-04-2016, 09:31 AM   #9
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I use air to blow out the lines. Set pressure to about 40-50 psi.
I pour the pink stuff down the drains but do not add it to my water tank.
You can get an adapter here.

https://www.amazon.com/Camco-36143-B...s=rv+water+air
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Old 10-04-2016, 10:31 AM   #10
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I have had water lines break because the air left water to collect in low places. Now I just pump the tanks down, open drain valves. Then close the valves, fill some few gallons of pink stuff, run pumps to all water devices until pink. I then leave the drain valves open when finished. Come spring, reverse.
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Old 10-04-2016, 11:07 AM   #11
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Finally found the owners manual for my compressor and it turns out that it is oil less. No worries! Thanks everyone!
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Old 10-04-2016, 11:27 AM   #12
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So glad I have 50 amp at the house. I just turn the heat on. lol
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Old 10-04-2016, 02:57 PM   #13
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Quote:
I have had water lines break because the air left water to collect in low places.
Like any procedure, you have to do it correctly to be effective. Air volume (lots of cfm) is what is needed, not high pressure. Smaller compressors don't deliver a lot of cfm, and the higher the pressure the less cfk (volume) they move. 20 psi is more than enough to move water from the lines as long as you have enough air to fill the lines.
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Old 10-04-2016, 07:25 PM   #14
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Don't forget the toilet when winterizing...
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