I have a 10 gal air compresser. I emty the water out of it sometimes and it accumulates a lot. Maybe 1/2 gallon a month, that is a wild guess.
I have pvc air lines.
Where it comes out of the compressor to the pvc I have a "T", one end is pointing down and I have a shut off there. My line goes up to the ceiling to route to another part of my shop. At the shut off I use as a "trap". It accumlates small amount of water and I open the shut off to get rid of the water. About 15 feet away by way of pvc air line, I have places to plug air lines in and have another "T" with the shut off pointing down to release water there also. This is where I have my store bought aire trap. It has never had any water, but I do have at my "T".
This is where I plugged in the air supply for my fluid bed, 12" x 16".
I was having a lot of trouble and called where I bought the thing and they said, "Oh, you don't have an air dryer?, Well that could be your problem."
So I bought a desicant dryer. It didn't help my problem and my problem was not moisture in the air.
I spray paint a lot, vinyl and 2 part epoxy, and I don't run the air through the dryer (I save it for the powder paint), and have never had any problems.
On the dryer it has these dessecant beads, they are white but have blue beads throughout and when the blue beads turn red, then they are full of moisture. I put them on a cookie sheet and bake at 100 degress for about 2 hours. They turn blue again.