Nice shots but I don't think I'd want to be near it when pressurized.
PVC really shouldn't be used to store compressed air. In short, pressure rated PVC is not rated to hold compressible gas and can fail violently when holding compressed air. See these threads for more information:
http://www.chiefdelphi.com/forums/sh...ad.php?t=75929
http://www.chiefdelphi.com/forums/sh...ad.php?t=77871