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Adding threads to chamber

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Adding threads to chamber

Unread postAuthor: Dom » Fri Aug 11, 2006 1:27 pm

Quick question : would adding thread coupler to the chamber ( to make it removable) would weaken the chamber to the point of making it explode at the point of the threads?
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Unread postAuthor: Velocity » Fri Aug 11, 2006 2:24 pm

Depends on what size/type of gun.

If its a 6" SCH 40 hybrid with sch. 40 fittings... then possibly

If its a 2" combustion, then probably not

I use 4" fittings on my pneumatic (which has a 6" chamber), and then have been no problems. Keep in mind, PVC has a huge safety factor (I think i said this yesterday in another thread....). Some PVC pipe manufacturors (sp?) recommend derating the pressure rating of the pipe 50% if you use threaded fittings.

As long as you solvent weld the threaded fittings in properly, use a quality sealing material to seal the threads, and tighten them enough, you should be fine.
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Unread postAuthor: benstern » Fri Aug 11, 2006 2:24 pm

First of all if you are using pressure rated pvc in a propane combustion cannon, there is no way in hell it will ever explode!
Just remember to solvent cement correctly and practice safety when using spudguns and you should be fine.
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Unread postAuthor: Dom » Fri Aug 11, 2006 2:28 pm

I am using ABS Pipes (SCH40). The chamber is 4", the barrel 2" and I would add Thread couplers on the chamber.. Just before the bell reducer.
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