YellowstoneBob
Bozeman, MT
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Joined: 10/24/2007
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Can't seem to find out what specs for a 110V compressor are needed to blow out my water lines at 30 psi. After 9 yrs in truck campers, we've acquired a class A. Winnie 29A doesn't have a real low-point drain so we need to blow out the lines when the rig sits for a few weeks, so the water doesn't get stale and/or start growing things. I'm considering getting an on-board compressor of the type off-roaders use. I'me being told that such a beast is fine for tires but doesn't have the cfm to blow out waterlines. Could someone out there who blows out their lines tell me what specs compressor (psi, cfm, tank capacity) works for them?
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tom_kat
way upstate new york/lake george area
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Joined: 02/28/2005
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you need a good sized tank that holds enought air that will put out 30 to 40 lbs continous for a few minutes at a time mine has about a 20 gallon tank and works good for blowing out our lines it keeps up with the steady flow of air you need to do it.after every thing is blown out i just let it run for awhile with all the faucets open to help dry the lines out.
1985 Class A Holiday Rambler Imperial 33 +1979 Class C Holiday Rambler Statesman 1000 = 24 ft
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Sully2
Cincinnati
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Joined: 01/20/2003
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YellowstoneBob wrote:Can't seem to find out what specs for a 110V compressor are needed to blow out my water lines at 30 psi. After 9 yrs in truck campers, we've acquired a class A. Winnie 29A doesn't have a real low-point drain so we need to blow out the lines when the rig sits for a few weeks, so the water doesn't get stale and/or start growing things. I'm considering getting an on-board compressor of the type off-roaders use. I'me being told that such a beast is fine for tires but doesn't have the cfm to blow out waterlines. Could someone out there who blows out their lines tell me what specs compressor (psi, cfm, tank capacity) works for them?
Basically?..ANY compressor that uses a tank. Reason why is this. Even a VERY SMALL tank model has an ON and OFF point of 90 psi on low and 110-12o psi on hi. Meaning the compressor shuts OFF when tank pressure reaches the upper limit and comes back ON when it hits the lower limit.
With the OUTLET pressure set at say 40 psi ( ??) it of course will reduce the tank pressure at a slower amount...but when the compressor kicks back in you still have an UNinterrupted flow OUTPUT of the 40 PSI. It doesnt hurt a thing to have the compressor running 100% of the time while you are clearing out the faucets..etc....because of the short duration that it would have to run.
Make it run for 3-4 HOURS without ever shutting it off...and of course you'd be buying a new one...
Find one that..
1) Fits the compartment where you intend on carrying it
2) Is able to inflate one of your tires
3) Capable of running any "smaller" air operated tool ( nailer or ?/..etc)
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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pkunk
Questa, NM
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Joined: 12/28/2007
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I have a big compressor in the shop, but also a small portable 4cfm oil type that is 120v and coupled with an 11 gal. portable tank it provides enough to blow the lines and charge tires, etc. It only draws 13 amps so runs on the geny just fine. Think I got it at Tractor Supply.
1989 Allegro, 30 ft., 454 CI 4 BBL, 3 spd.auto, 125gal.gas tank,85g.water & 85 grey &75 black holding tanks. 3-12v Optima 31m coach batteries
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wa8yxm
Wherever I happen to park
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Joined: 07/04/2006
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I use a small portable "Pancake" compressor from sears
Most any tank type compressor will do just fine.. Might need a pressure regulator is all.. (I have one) don't take a lot of stored air since you blow for a minute, then let up, wait, blow, wait, blow.. Well you get the idea, the compressor has recovery time while you wait
Now the one I have hits 150 psi rather nicely, comes in handy when you want to blow up a 110 psi tire.
Nothin adds excitment like something that is none of your business
John is Near Kenwood TS-2000 housed in a 2005 Damon Intruder 377
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427435
Rochester, Mn
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Joined: 11/12/2005
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If you're only using 40 psi to blow out your water lines, you better have a short, large diameter hose from the air compressor tank and an adaptor fitting with little restiction. Otherwise that 40 psi on the gauge will quickly become 20 psi or less and you won't get all the water out of the low points. I leave my compressor at 100 psi, but I don't apply air until I have one faucet open and I don't shut it until I have another one open.
Mark
2000 Itasca Suncruiser 35U on a Ford chassis
2003 Ford Explorer toad with US Gear brakes,
ReadyBrute tow bar, and Demco base plate.
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dbates
Marion, Indiana
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Sear has a 3 gallon, 125 psi with 2.4 cpm max. adjustable pressure valve compressor on sale for $99 that should do the job. It measures 19" high, 9" wide & 19" long & comes with a 25' hose. You will need to see if that will fit in one of your bays.
Click HERE is the webpage.
Here is how I mounted a similar one in my MH bay with a hose reel from Harbor Freight. I just plug it into MH outside 120 outlet & run it with pedestal or generator power.
Plus New Brunswick, Prince Edward Island & Nova Scotia
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s79vette
Twin Lake.Mi.USA
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Joined: 06/03/2003
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30 or 40 pounds of pressure isn't needed. 1 pound of air pressure will lift water
in a line over 27 inches, So figure how hi your lines are and if they aren't more than eight feet above where you attach air hose you only will need about 4 pounds of air to blow out lines.
2003 Gulfstream Ultra Supreme Ford V10
93 Ext4x4 Dakota,or 2004 Jeep Liberty, Blue Ox, Brake Buddy
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427435
Rochester, Mn
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s79vette wrote:30 or 40 pounds of pressure isn't needed. 1 pound of air pressure will lift water
in a line over 27 inches, So figure how hi your lines are and if they aren't more than eight feet above where you attach air hose you only will need about 4 pounds of air to blow out lines.
Your post is wrong and very dangerous (as it applies to getting water out of MH lines). A lot of water will remain and settle back into low points with that low of pressure. Those spots will burst when the water in them freezes.
Consider what happens if you introduced 1 psi air into the bottom of a pail of water??  The water doesn't come out of the pail---you get a bunch of bubbles!!! 
What you really need is a lot of volume to "carry" all the water out of the lines. To get the volume, you need lots of pressure and minimum restriction before the air gets into the MH's water lines.
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s79vette
Twin Lake.Mi.USA
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and I agree it should be more than 4 pounds, but the poster was inquiring about
compressor sizing and was concerned about being to small. 4 pounds of air will move all the water in his water lines. reguardless of the volumme 27 inches of water equals 1 pound of pressure. build a monometer and see for yourself or look it up on ASK.
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