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Super cool air and air compressor questions

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Mace56

06-16-2006 14:55:21




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Somebody posted this trick. Wonder if anyone has tried. If you have extra air hose. Run coils in a bath of ice water to remove the moisture. I guess you would run a little air dryer before the gun.

My paint dealer has a real pretty Finishline filter regulator. I thought about running a $10 air hose from compressor tank, thru the wash tub with ice, to that filter unit then my regular line to my spot gun with a little bulb air dryer near the gun.

What ya think?

Secondary question, my 3HP compressor is pretty close to my spray area. Do I need to move it outside to avoid pulling in the vapors?

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Rod (NH)

06-16-2006 19:25:56




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 Re: Super cool air and air compressor questions in reply to Mace56, 06-16-2006 14:55:21  
Mace,

Your 6 cfm compressor should have no problem at all supplying your spot gun. There are much more effective materials to use for coils in ice water - like steel or copper - rather than an insulating rubber hose. But they would typically cost more. However, the basic concept is sound and could be implemented with hose if for no other reason than because it's "better than nothing". I'd keep the hose coil upstream of your regulator though because frictional pressure drops are less at the higher line pressure.

I assume by "pretty close" you mean actually in your spray area. If your drive motor is a TEFC one, you shouldn't have a problem. If it's an open type however (and it probably is), it would be unacceptable in any kind of commercial operation where an actual explosion proof system (including lighting) would be required by regulation. Most DIYs are not going to be too concerned with it, instead relying on the fact that, most probably, the concentration of solvent vapors will be significantly less than any lower explosive limit. I can't say that I have heard of any DIY getting blown up by painting his car in his garage. I stopped painting inside years ago when I observed the quantity of overspray buildup in open windings of the motors on both my compressor and my exhaust fans. But I was painting entire cars with high volume equipment in a relatively small area. You'll be evaporating solvents at a relatively low rate (spot gun) and if your area is relatively large your risk should be very low, especially if you have exhaust fans in use. With a spot gun, I'd be more concerned with proper respiratory protection than being blown up. However, locating your compressor outside (or otherwise isolated as much as practical from) your spray area on a temporary basis, would be a prudent course of action.

Rod

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CNKS

06-16-2006 17:43:07




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 Re: Super cool air and air compressor questions in reply to Mace56, 06-16-2006 14:55:21  
In the absence of a larger compressor plumbed with metal pipe, it will help. But you need the water trap as near the end of your line as you can get it. You might consider plumbing it at the end of your existing hose and adding another hose to your paint gun. With a small compressor though, you may get too much pressure drop, and depending on the air requirement of your gun, your compressor may be too small. The 3 HP is peak HP, really only about 1 HP continuous. You will be lucky to get 6 or 7 CFM at 40 psi, so you have to be careful matching the gun to the compressor. I don't get any water at the end of my line, but it is 100 feet long, run through two water traps.

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Mace56

06-16-2006 18:18:57




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 Re: Super cool air and air compressor questions in reply to CNKS, 06-16-2006 17:43:07  
Yes, I have not looked at side for a while but it is about 6 CFM at 40 as I recall. My mini gun is supposed to pull about 4.5 CFM.

I have had the compressor for a couple of years, it was a big move up from my little 1/2 HP tankless noisemaker but I probably should have spent another $100 a got more air capy. Maybe next time.

I will post a link to this guy's article on painting.

Thanks.

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Mace56

06-16-2006 18:20:26




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 Re: Super cool air and air compressor questions in reply to Mace56, 06-16-2006 18:18:57  
Try again...

http://www.thebugshop.org/bsfqpnt.htm



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