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Compr. and Filters...help? water in lines

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06-16-2000 15:06:17

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I need to fire up the HVLP gun this weekend. My air compressor (of course) blows a small amount of water out of the tank when I release the pressure. I bought an in-line filtration system that has two small filters/tanks one for water, and the other for oil. Problem is, the threads to attach the in line, and the exit lines are too large for my couplings and 1/2 or 3/8 hose. Is there a reducer available to attach these two different size couplings? 2nd Question: I also have about 6 of those small disposable in line plastic filters. Can I used those instead in case I cannot attach the other system? Will they effectively pull water from the lines and filter it for topcoating acrylic enamel? I need some advice... Do I need to be concerned about water at all? thanks! tm

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08-02-2000 07:03:41

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Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 15:06:17

There are a few things to consider. You probably won't want to apply paint with wet air. It will cause "fish eyes", small blemish on painted surface. There are quite a few ways to remove water from air. First determine the horsepower of your compressor. Whatever it is, multiply the horsepower by 4.5 to get the total flow out of the compressor at full flow. If it is a 2 hp compressor, you have the capacity of 9 scfm (standard cubic feet/minute) out of the compressor. This is what all items you use to remove water should be sized for. When air is compressed, heat is generated (heat of compression). For every 20F rise in air temperature of the compressed air, it has the ability to carry twice as much water. The most effective way to remove water from your air is to cool it. As mentioned earlier, The water accumulates in your tank because the air has been heated while it was compressed. While it stays in the tank before you use it, the water condenses out as the compressed air cools. So on the outlet of your tank, you could cool the air and have some way to seperate the air from the water after the cooler (separator). This separator should have a drain on it( you could use a manual drain, valve). You should use a high quality coalescer filter instead of the dual filter bowl you described. Do not put oil in the second bowl of you arrangement( should you decide to use it) for painting. For reference, a high quality coalescer filter with housing costs about $ 100.00 for a system up to 4-5 horsepower. To summarize, cool the air, have a separator/drain and high quality coalescer. A high quality coalescer could be used in the dual function as separator and filter when on a budget. The only other way to get water out is to by some type of dryer; single tower w/adsorbent, refrigerated dryer, dual tower regenerative dryer. These are rather expensive and probably are overkill for your situation.

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Steve U.S. Alloys

06-17-2000 09:18:18

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Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 15:06:17

This is probably way more effective than what you are looking for, but, it never hurts to know about it. We sell a filter for metallising systems where no water at all should be tolerated. It is a centrifuge in essence that is powered by the air in your lines. No pressure drop as it is fitted with ball bearings. It spins the oil, water, whatever, off of internal blades and out to the sides of it's housing where the foriegn materials stream down and out of the bottom thru a small adjustable valve. Real nice set-up.

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9N'er

06-17-2000 14:15:33

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Re: Re: Compr. and Filters...help? water in lines in reply to Steve U.S. Alloys, 06-17-2000 09:18:18

Hi Steve! A couple things: One: I asked about welding cast iron a month or so ago and you pointed me in the right direction. I called a machine shop, they knew exactly what you were talking about... peening, stress relieving, terminating the crack by drilling, type of rod etc. The welded this week, and it worked fine. Thanks for the education. I am going to post some spray questions above. But your unit sounds excellent and I'm sure is top quality. Probably more than my intermittent use requires...but if I end up spraying a lot...I'll remember your product. thanks Steve for your interest. 9N'er

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MarkB

06-16-2000 17:30:13

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Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 15:06:17

First, take the plug out of the bottom of your compressor's tank and drain all of the water out. If you've never drained it, there's probably a bunch of water in the tank.

Next, take all of the stuff that you need to hook up down to your neighborhood hardware store. They'll sell you whatever it takes to hook it all up.

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9N'er

06-17-2000 14:18:02

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Re: Re: Compr. and Filters...help? water in lines in reply to MarkB, 06-16-2000 17:30:13

Thanks. I went to the hardware store and to my pleasant surprise they has a rack of items. Unfortunately they did not have the 3/8 to 1/4 reducer in brass, but black iron. I bought those as a temporary solution for this weekend...and coated them in zinc phosphate to cut any spot rust that could occur. thanks for your insight.

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sammy the RED

06-16-2000 15:44:34

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Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 15:06:17

You should be very concerned about water in your line when painting. Unless you are useing a waterborne paint you should get those filters and catcher in line. Go to your local hardware and get the fittings you need to hook them up. Yes, you also should use the plastic filter. The setup I use is, spray gun - air gauge, to measure air at gun inlet - disposeable plastic filter - air hose - preassure gauge - air line - tank gauge. What model HVLP are you useing ?

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06-16-2000 18:29:24

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Re: Re: Compr. and Filters...help? water in lines in reply to sammy the RED, 06-16-2000 15:44:34

Devibiss Finish Line brand... With the vertical feed cup, plastic liners etc. See if I have this right: HVLP gun --> air regulator --> disposable filter --> line --> filters/oil and water with regulator valve ---> line --> compressor. ??

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sammy the RED

06-16-2000 20:50:08

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Re: Re: Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 18:29:24

Yup, you got it. Good luck and dont forget to wear a resperator.

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buck

06-16-2000 15:37:10

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Re: Compr. and Filters...help? water in lines in reply to tm, 06-16-2000 15:06:17

Can't say much about your filters but any good hardware store should carry the fittings that you need.

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