Thanks fellas. I picked copper tubing for a couple of reasons. First off, it is strong, durable, and relatively low cost and easy to work with. There is some really good info on Copper at this web site to help with planning:
Copper Tube Handbook My second reason is because it looks really good and it goes well with my retro theme of my work shop. So, I externally mounted it to show off its wonderful look.
The back-and-forth weaving of the copper tubes near the compressor is to provide a long run of tubing in a small space to cool the compressed air in order to remove the moisture (via a trap with a valve located off to the left of the compressor), before it gets to the pneumatic tools used down range.
