> I can't say that this is the "final" word on the subject, but I've been
> been told NOT to use PVC.
I understand and agree with the reasons for this.
> I've also been told not to use copper. However, another friend has his
> garage done in copper and so far hasn't had any problems.
Type L ('blue', normal middle-thickness pipe) copper is OSHA-approved
for compressed air and it's what I used. Type M ('red', the thin stuff)
is not. All the same rules about sloping horizontal runs and providing
drains still apply.
> When I did my garage, I used black pipe.
I used black pipe for the gas piping in our house. I didn't have
threading or cutting tools here but I got very friendly with the guys in
the back of the OSH a mile away (some were far better than others, I
ended up teaching a couple of 'em what to do...)
When we did our remodel I added up every electric load we might ever
have in the house, including provision for some machine tools out in the
shop, did the appropriate load-factor derating and handed it to the
PGandE guy and he gave us a 320-amp service.
I did the same for the gas service, including a hot-tub heater, outdoor
kitchen, two tankless water heaters, etc etc etc. and we ended up with a
1 1/4in meter and supply.
Don't have the Bridgeport yet, but I'm really glad we've got the big
electric service. Never done the hot-tub or the backyard patio heaters
but it's good to have the capacity if the wife commands.
> The Black pipe was actually pretty easy to work with given the correct
> tools.
I'd rather solder copper...
John.
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