Water in air supply line

by Bill Pressell
(Burnet, Texas 78611)

how to remove water in air supply line. 240 volt service station style single stage air compressor is located in my well house about 150 feet from the garage. about 4 years old. never a problem. this year the air pressure has reduced dramaticly. I used 3/4 inch Pex pipe for the supply line which is buryed about 12-18" deep. Any trick to remove the water & how can I avoid this problem in the future??

Bill Pressell
Burnet Texas 78611

Bill says...

Bill, there's tons of info on compressor water issues on this site. Click on the Compressor-Water navigation button, and read all the pages.

Use the sitemap to find the pages referring to blowing the water out of sprinkler lines. This information should help you in removing water from a buried line.

Thanks for visiting.


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Oil Contamination from Black Iron Pipe in Compressed Air Systems

by Amanda
(Indianapolis, IN USA)

We have three oil-free compressors for a production system, with one used as a primary (Atlas Copco ZR315VSD) and the other two (Atlas Copco ZR110 and Kobelco KNW2-A) running basically as backups. We also have desiccant drying systems (Atlas Copco BD1050 for the primary and two Hankison dryers for the backups) installed. I think that the generation system we have is pretty good. Now for the question...

With the oil free compressors, and coalescing filters upstream of the dryers, how much oil should I expect at points of use if my piping distribution system is primarily black iron pipe with some stainless and galvenized pipe tossed in here and there?

I'm using Drager tubes for detection (limit is around 0.1 mg/cubic meter). I haven't officially checked pipe slope, but my belief is that we do not have a single low point. Also, the dew point sensor on the dryer discharge indicates that our discharge air is really dry (dew point ranging from -111F to -40F). The distribution piping is not new (older than 15 years)...and I'm struggling to understand how long I should expect to see hydrocarbons leached from the pipe. Any direction you can provide would be appreciated. Thanks!

Bill says...

Amanda, your question is batting in a league far above my own. Hydrocarbon leachate from Black Pipe? That's a new one on me. I would expect that, over time, black pipe would rust, but I had no idea that you would an oil derivative leachate from black pipe too.

I expect that over the 15 years of use, moisture has entered or condensed within the piping system, and therefore, you will have rust buildup, and this rust could, in time, release and follow the air flow to point of use.

I'm not high on the use of galvanized pipe as I believe that the galvanization on the pipe interior, over time, will crack free and flow downstream to the point of use.

OK. Fellow compressed air users. I don't know from oil leaching out of black pipe. Any of you can provide insight for Amanda???



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Not getting enough air pressure

by tom
(bancroft ontario)

Hi i'm new to compressors I have a 42 gallon tank and a 2horse motor it was given to me from a friend it was made from a 2 horse mastercraft compressure and the motor is electric and the parts are all new the, trouble is it builds up pressure and shuts off at 115 psi and comes back on at 90 psi but when I hold my finger over the blow gun I can stop the air flow {no pressure} and I don't know what or how to fix the problemneed it to spray things so if theres someone that can help please do so asap been reading tons of stuff of stuff but still can't find a cure thanks

Bill says...

Hey Tom:

I did answer your first submission already, so here's the same advice. Others are welcome to contribute too.

If there is air in the tank, the upstream gauge shows pressure, the regulator gauge shows 115 PSI pressure too, then there is air getting to the regulator.

Assuming that you had air coming out of the compressor to your paint gun before (is this so?) then something has changed.

It were me, I'd turn the pressure down to about 7 PSI on the regulator first.

Then I would look inside the discharge coupler.

With safety goggles on please), and again, very carefully, I would insert a small blunt object (pencil perhaps) to try to unseat the ball check inside the coupler at the back of it. Does air flow out when you do this?

If so, you now know that air is getting out of your air compressor properly, and assuming that you air line connector fits the coupler properly, you will have air flow into your air line.

Disconnect the coupler from the spray gun connector, and again, very carefully, push the ball check inside the coupler at the end of the air line to see if air bleeds out. If yes, the problem is in the valve in your gun.

I'm not a paint gun specialist, but if it is the gun, then I suspect it wasn't properly cleaned last use, and paint has gummed up the works.

Good luck.


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