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Re: Air Cannon
I strongly suggest that you remake the barrel out of ABS plastic. Unless you have a burgoiuse amount, it should be pretty cheap (I got 5 feet of 2 inch dia ABS plastic for about 6$).
Even though the PVC will not be subjected to pressures over 60 (probably) for more than one second at most, if PVC fails it will shatter, whereas ABS will split or crack.
So, in terms of safety, Cracking > Shrapnel.
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