The cheapest way is steel pipe. If you want to do plastic pipe to be free
from rust, be sure you don't use plastic plumbing pipe, either schedule 40
or schedule 80. Under the kind of air pressure you will carrying, this type
of pipe can become shrapnel if it is hit by something while under pressure.
There is a special green plastic that is made specifically for carrying
typical air pressures. The trade name I cannot remember, but if you call THE
BERTSH CO. OF GRAND RAPIDS. +1 (616) 452-3251 they can tell you what it is
and send you literature. The pipe is not too expensive, but the fittings
are, so plan your layout to minimize fittings.
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