First time home setup advice and questions

[Jamieg285]

I'm getting ready to buy my first compressor - 3HP, 90lt belt driven from Burisch (best I can get with my budget). The main reason for it is to paint my car, but will also run a few hand tools - sander, ratchet etc.
I've done lots of reading and have come up with the following plan for some hardline to fit in the garage (fitting around existing wall furniture/sockets).
I'd appreciate any comments or suggestions. I may or may not add the air dryer in blue, depends on whether any water gets that far.
I'd also like to know if the final drain leg has to be vertical all the way, or if I can add a turn (could be 45degree to maintain downward direction) to put the end in a more convenient location (red pipe)

Total run length to the hose outlet will be about 9m. Will using 22mm copper be much better than 15mm for the distance?

Does a regulator/filter have directionality, i.e. specific in and out ports, or can it be plumbed in either direction?

Any advice gratefully recieved.

 

[rtbcomp]

15mm will be fine, although I'd use 22 if cost wasn't a problem, my reasoning being that the 22mm has a greater surface area thus improving cooling.

One problem you have above is that there are 2 pipes where the air is going uphill, this will pickup water dropping downwards. If you arrange the cooling runs to be horizontal (just sloping down slightly along the direction of airflow) you'd pick up less water and get better cooling.

Personally I'd go against convention and lay my pipes close to the floor (where it's cooler) sloping downhill from the compressor with vertical upwards legs to the outlets and a drain valve at the very end.

 

[rtbcomp]

The only problem I can see with low level pipes is that they'd be vulnerable to knocks.

 

[Jamieg285]

Not sure that low level will go in the space I am working with. I may be able to put the up high though, but my concern will be how much space the rows will be, as I won't really know without building it, and then it may be too big for the available gap. Possible alternative option:

The other question would be do I need another trap/drain where indicated in green, or should the length of pipe and filter be enough?

 

[rtbcomp]

That would be better. I wouldn't bother with a drain near the Reg/filter; the drain on the filter will suffice.