Did you know looping your air system can save your plant energy? A lot of customer call and complain about not enough air pressure at the tail end of their air system. We call this a dead end, a quick fix would be to "loop" the air lines so the air flow can run in different directions.
For example, if you have 300' of 1" air line (not looped) with eight-(8) 90 degree elbows (25' per elbow) which is an additional 200', this gives you 500' of pipe, the pressure drop from the compressor room to the end could be as high as 2.210 psi per 100' or 11.05 psi drop for 500' of pipe.
In many cases, what people call a capacity problem is actually a distribution problem. A quick fix for this problem would be "looping" the air system. This would enable air to flow in both directions. In the example above, the air piping of 500' would be calculated at 250' because the air flow is distributed evenly. Therefore, the pressure loss would be 5.525 psi.