what is the type of copper pipes to be used for air compressed system working at 10 bar pressure?
Use a copper-beryllium ASTM:A242 alloy, it has sufficient tensile properties for this application
Why copper? I would use galvanized or black iron pipe.
heavier wall the better; as is in any installation; building or repairing on the cheap isnt so cheap or wise in the short or long run . if you're on a budget ; maybe you should'nt be doing it at all. call a Plumber to do it and pay the bill with a smile. it's worth the money to have it done right the first time.