SpudFiles

If you're in the US I can get you 2 1/2 ft of 4in PVC for $6-7 but you'd have add for shipping. I'd just look around more if I were you.

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hmm, i see, but what is non cellular core abs?? the only abs i see around here is cell core. so youre saying that cell core abs for pneumatic is a no-no even if the pressure is only going to be 60 but non cell cure abs is okay?

Never use Cellular core. EVER. IN ANY CANNON. Also, ABS can be bought pressure rated, it's just not common. Maybe you should consider a different C/B ratio? A chamber with a huge diameter doesn't always make it great....Anyway, if it's not cell core, the DWV can probably be taken up to 60-70 psi. I would actually install a pop-off valve, just to make sure you don't accidently go over the limit, but it's probably not neccessary.

^^ actually, alot of ppl use cell core abs for combustions.

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SpudBlaster15 wrote: Even if the ABS chamber failed, it would not do so in an explosive manner. It would simply rip down the length of the pipe, releasing the pressure with nothing more than a loud bang. PVC tends to fragment upon failure, especially when cooled to 0*C or lower.

I'm not going to get in a bitch fight with you SpudBlaster, I'm just adding a bit to your post. ABS can throw fragments; they just aren't small ones. I intentionally blew up some 3" DWV cell core ABS (300+ psi pressure spike ) and the smallest piece I could find was about 4-5" long and about 2" wide. There were 8 or 9 pieces.