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The relative humidity coming off the silica gel needs to be about 10% at 95 degrees ambient. There might still be enough to condense momentarily when it goes through a nozzle and chills down.īut you made me investigate this a bit further. The typical air compressor, for home use anyway, builds 120 PSI which is 8 atmospheres (9 atmospheres absolute) If the desiccant removes 89% of the moisture from the incoming air stream, there will not be enough moisture inside the tank to condense. The trick is the vapor pressure of the water inside the tank is the same as the vapor pressure outside the tank once the temperature inside the tank returns to ambient.Įffectively, the air in the tank can hold the same amount of moisture as the equivalent volume of air outside the tank regardless of the pressure inside the tank.
![central pneumatic air compressor 4 gallon drain plug central pneumatic air compressor 4 gallon drain plug](https://i.ytimg.com/vi/gkenExSIIG0/mqdefault.jpg)
Does this make sense? Is this a normal thing that all compressors do? The only explanation I can think of is that when air is flowing quickly the valve gets cold enough for the water going through the valve to freeze, then when the flow slows down the ice melts and the valve clears. Sometimes when the compressor is draining, the air flow slows down to almost nothing, then there's a popping sound and the air flow speeds up again. Could any significant damage have occurred from having a little pressure and water in the tank for a week or so?Ģ. The water was brownish but after the water dried it left an oily residue so I'm hoping that the brown color was either from compressor oil or some kind of oily anti-corrosion coating on the inside of the tank (is there such a thing?) rather than rust. Could this just be because the tank was colder when I closed the valve after draining than it was when I reopened it a week later? I then moved the compressor with the valve open and some water came out.
![central pneumatic air compressor 4 gallon drain plug central pneumatic air compressor 4 gallon drain plug](https://i.ytimg.com/vi/WgG_2wGxEwo/maxresdefault.jpg)
About a week later I opened the valve and was surprised that some air came out. Once after using it I drained it completely (or so I thought, see #2 below) and then closed the drain valve. Here are two things I've observed, and I'd like to hear your thoughts on them:ġ. How dry does it have to be to keep it from rusting? I drain it after each use but it seems to me that It's probably impossible to get every last bit of water out of it. I want it to last a good long time, and I especially don't want the tank to explode. I recently got my first compressor (Craftsman 19541, horizontal tank).