Not a pro... but I'd run it with a drip leg with a ball valve to allow quick/easy purges.
I'm sure there is a code to follow... but I figure if they allow natural gas lines (yeah, low pressure but they go BOOM) outside a house then an air line should also be ok.
That TP article was interesting.. they really like the 'up and over' type legs. Theory being that a rapid change in direction will force the air to condense and fall out of suspension (that's also how a drip leg is supposed to work).
It takes quite a bit of velocity for that to happen... not sure how effective it is in a low CFM shop environment. Also that means more joints to leak and vertical runs that will stand off from the wall (or a header that must be hung away from the wall).
I really haven't dealt with any moisture issues in my simple setup (1 in black pipe header with T's and vertical up nipples). Maybe what I have is enough.
Last edited by pfarber; 04/04/2015 2:45 AM.
