Hmm...a quick search of Google returned this:
http://www.potters.org/subject93780.htm
This part peaked my interest:
Finally, one last consideration I belive is important: whether the
compressor is stationary or portable. If your studio is a "real" potter's
studio where you make a living with clay, then you might want to buy a
larger "stationary" compressor and tank and install it permanently around
back in a sheltered alcove of some kind where you can pipe compressed air
to wherever you want it. It's convenient, quieter and you can limit
compressor maintenance chores (changing oil, etc.) to a place designed for
that without having it all over your studio. If your operation is much
smaller, a roll-around compressor might do. IF YOU PIPE the compressed
air you should NEVER use PVC or plastic pipe. I know -- it is rated for
400 psi or so, but that is WATER PRESSURE, which is constant. Air
pressure in a piped system varies with every stroke of the compressor's
piston(s). In time, it can fatigue and burst, propelling shards of PVC
everywhere, including into one's eyes and body! Don't use PVC. Black
cast iron seems to be the standard.
I only think that's true to a certain point since many people (including me) use plastic chambers for our pneumatics and are fine with it. Mabye the schrader valve somehow regulates pressure since it's a tiny opening:?:
So then you'll have to go for metal components for a compressor tank.