FIRST air cannon robots PVC??

[Andrew Schuetze]

When I get a bit more time, I'll add links to the various threads on C.D. on this topic.

My question is how / where does one get a definitive answer as to the pneumatic pressure rating of schedule 40 PVC? I was intrigued by the team fusion air canon last year and then decided to add one to our 2005 robot this August. I'll post a picture of the prototype mounted on my classroom workbench. It works okay. Based upon three weeks of development, what I perceive to be limiting the performance is the restriction of air flow from the storage tank via the 0.5 inch fitting. Everything else is the same 1" diameter as the sprinkler valve and then expands to the 3" diameter at the back of the muzzle.
I've seen about three cannon systems which are using PVC pipe as the pressurized air storage system here on C.D. People have commented that PVC pressure ratings are for water systems and in fact the fine print at the store indicates use for water only.

My fear is that a bump into a doorway or drop on the floor may start a crack in the PVC pipe and eventual lead to catastrophic failure.

How do I know if I am being overly cautious or just being prudent?

APS


Toltech prototype