DO NOT USE BLACK PIPE --- there is moisture in your lines - compressors tend to do that -- Remember - if you have 7% humidity - and you take that same air and compress it - now you that same amount of moisture multiplied in the smaller space and the lines WILL RUST INSIDE... Big mistake...
Go with Schedule L copper... and sweat it - and you can sweat on threads when you need them. I also used "couplers" where appropriate so that I could take a regulator out without undoing all the joints... and anywhere I put in a coupler I made sure to use a ball valve to shut that section of the system down.
JMHO... for what it's worth.
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