Discussion in 'The Tool Shed' started by Focker, Feb 7, 2018.
I drilled a hole in the outside wall & ran a hose from the valve through it.
I have a 1/4 in. nylon hose on the drain line that sneaks out in the little gap at the bottom of the garage door.
Since my compressor is back in the far corner of the garage, and I haven't drilled a hole through the wall for the drain hose, I drain my condensate into a big clear plastic pretzel container. I just crack the ball valve open, and at pressure, get a steady stream of rust stained water. I keep the end of the hose near the bottom of the container. After a quart or more, it starts to sputter. I shut off the valve and empty the container. Then I come back and crack the valve open a little wider (with the end of the hose back in the container) to blow off the remaining moisture.
How big of a tank do you have? I drain my 2 gallon pancake compressor after use, but that's a whole different animal than my 80 gallon!
So, just to continue this conversation, wouldn't a drastic change in pressure also create moisture?
My 80 gallon hardly ever kicks on unless I'm using it for an extended period, and I only seem to get a cup or less of rusty water weekly. I've seen moisture buildup in my empty compressor too, which leads me to believe it's inevitable.
Once this one rusts enough to have a pinhole, it's probably time to upgrade or rebuild the pump and motor anyways!
The air is hot from compression, and I'd guess the cooling of the air when you shut down would induce some additional condensation. The vapor pressure of water gets lower as the temperature goes down (cold -> dry). When the compressor is running, the higher pressure of the air lowers the saturation limit (dew point) and forces the water vapor in the air to condense. I would expect this to be a much larger effect than cooling.
yup, same way I do it.
Must be nice to live in such a dry location. I've drained my condensate 2-3 times a day when I'm sandblasting, with a quart or more each time. Temperature and humidity!
Which state are you in? I drain mine about once a year or when the air coming out the hose gets wet, usually not a problem at least for air tools, sandblasting and painting I could see being a different story and needing a dryer in line.
The air coming out of the hose is always wet. Try aiming it at a cold surface and you'll see the condensate.
* Remember...I would drain my compressor after use...But changing my routine after starting this thread.
I had to use the compressor the other day. I started it up with the drain opened to release any moisture. After the compressor turned off, I drained the moisture again. I turned off the power and walked away leaving the tank under pressure. Today I came out to the garage and popped open the drain...No moisture! I know moisture is at it's greatest after the compressor cycles, but leaving mine under pressure is creating less moisture due to not filling up an 80 gallon tank every time I want to use it. I still have 120PSI left in the tank.
Keep in mind that I am usually over shop air and compressors.
With that said , you are not supposed to drain condasate on the ground because of the oil that may be in it.
On larger systems I try to minimize the amount of air being released by a “blow down” as it equals real money in electric use.
May want to look into low loss drains
My employer in Ft Lauderdale wanted bone dry air with very little investment.
I had a 25 Hp Quincy recip and A 25 Hp hydrovane both with an aftercooler and refrigerated dryer...... the auto drains would look like a high pressure gatden hose.
They also insisted on 120 Psi line pressure to compensate for poor fixture design.
Hmmm - about every 6 to 9 months I drain mine... rarely get even a couple table spoons of moisture.
I just let mine blow across the shop floor. So little water its usually dry by the time the 80 gal tank empties.
I have a ~30g Quincy roller. A few years ago, the drain was full, trickled out of drain. Took for ever.
Let the pressure off, opened tank caps, rinsed inside with a high pressure sprayer, recapped, and then repressured.
Used the air to further dry, now flowed good out of drain petcock.
I drain it when i think of it. Sounds like something to do this weekend. Might look at a ball valve drain config.
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