Compressed Air Piping
This compressor company says copper can be safely used:
Guide to Compressed Air Piping Systems | Quincy Compressor
Might see if you can get it from a HVAC supply company like United.
Tip: HVAC industry calls out sizes for copper tubes by the outside diameter. Basically the same way most of industry does for tubing ( and hoses are inside dia.).
In plumbing, the same size copper tubing is called out as if its pipe - by a nominal inside diameter.
If you're buying fittings from a HVAC supply place, just tell them what O.D. you need the fitting to match. That way there should be less chance of confusion. I don't remember if they typically use nominal sizes for fittings. And even if I did, it doesn't mean its done that way where you live.
This compressor company says copper can be safely used:
Guide to Compressed Air Piping Systems | Quincy Compressor
Might see if you can get it from a HVAC supply company like United.
Tip: HVAC industry calls out sizes for copper tubes by the outside diameter. Basically the same way most of industry does for tubing ( and hoses are inside dia.).
In plumbing, the same size copper tubing is called out as if its pipe - by a nominal inside diameter.
If you're buying fittings from a HVAC supply place, just tell them what O.D. you need the fitting to match. That way there should be less chance of confusion. I don't remember if they typically use nominal sizes for fittings. And even if I did, it doesn't mean its done that way where you live.