Ray gave us a couple of very good posts on copper and iron pipes.  I would 
like to add a couple of points from my mistakes.
 Galvanized pipe is for water.
Black iron is for gas and air.  You don't want the galvanizeed particles 
coming off and blocking gas orfices or damaging air tools.
If you have to bury gas pipe, look for the approved plastic or the plastic 
wrapped black iron, don't bury the raw black iron.
Believe it or not copper tubing can flake off inside and block some gas 
orfices.  Our local gas company will not turn on gas to installations 
haveing copper lines.
Ron




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