I have set up the air lines in a couple of factories and have a couple of hints. Pitch the horizontal lines that run around the walls back to the compressor. This way the water can be drained from the tank daily. The tap off for the vertical lines should not be tee'd directly down from the horizontal line but should go up about 3- 4 inches and then down. This way any water in the lines will not go into the drop lines. The bottom of the drop lines should have a shut off valve then (going downward) a tee with the air line couplers and then an additional piece of pipe at least six inches long with a drain value at the bottom. The upper valve lets you shut off that drop. The last piece of pipe collects the condensed water and any debris in the lines and the drain valve lets it out.