Something else to consider when designing your system that is often overlooked is drip legs and drop legs. Below is from an article I found not long ago. It will protect your tools over the long run and is simple to do when plumbing it the first time.
Drop and Drip Legs Condensation can take place in air piping systems even though after-coolers, dryers, receivers and separators are installed. When air lines are exposed, for example, to low ambient temperatures, moisture can condense. This is why drip legs should be installed at all low points in the piping system. A drip leg is a pipe extending downward from the bottom of the air line to collect any condensation flow in the pipe. They should be the lowest points in the air line and at any point where the air line dips to go around an obstruction. An automatic trap or drain valve should be installed on the bottom of the drip leg.
A drop leg is a pipe coming from the top, rather than the bottom, of the main air distribution line to feed air to an outlet for tools or an air-operated device. The drop leg is taken off the top of the main line so that condensation does not easily flow into the drop leg. It should be designed with the tool air outlet coming off the side of the drop leg rather than the bottom so condensation will collect below the tool outlet. A drain or trap should be installed at the very bottom. All drop legs throughout the system should be taken from the top of a tee with a wide sweep return elbow. This reduces the chance of a carryover of condensation from the main header or branch line to the outlet.
Pipe Slope
All lines in the system main and branch lines should slope or pitch downward at least 1" per 100 feet or less in the direction of the air flow to a drain point – drop leg, receiver, etc. This will allow condensation to collect at the low points where it can be trapped and removed.