I plumbed my shop for air on Monday and Tuesday this week, and noticed yesterday while working in the shop that the compressor was kicking on every 20 minutes or so.
Turns out several of my joints (using 1/2" pipe) are leaking. Very slightly, but you can hear them if you get close.
So I repaired a couple of them, and just for fun (yeah right) sprayed the rest with soapy water. Leaks EVERYWHERE!!
I used teflon tape to seal the joints, but evidently didnt use enough. When I run gas lines I always use Harvey Seal (the yellow dope) and never had a problem. I figured since air isnt flammable I'd use tape since the yellow stuff is so messy. Big mistake.
So for all of you planning to plumb your shop with iron, make sure you use the goop for sealing, and NOT tape. I guess you can use tape, but it takes WAY MORE to seal black pipe than typical water line fittings.
So, I'm out to the shop to completely dismantle probably 50 or more joints and redo them.
Almost makes Black Friday shopping appealing.