As a matter of fact I service air compressors for a living. I can attest to
the fact that a compressor bolted to the floor without anti-vibration pads
is a warranty voider with all manufactures. Some where at the shop we have
pictures of a failed receiver that was bolted to the floor and the weld
snapped at the leg. It bowed a concrete block wall out almost 16" and bent
the i-beam header almost 9"

We will not service nor will we pressurize a tank with a failing weld in it.
By the ay PVC piping is a code violation in all 50 states. It may not be
used for pressurised air systems as the oils in the compressor breaks down
the PVC and the glue. A severe schrapnel hazard when that stuff goes. It
is not pretty either.

I also did warranty work for Champion Air Compressors and Gardner Denver
they also void a warranty for no vibration pads

Carl Stigers
Northeast Compressor Center
Atlas Copco