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Storing my cannons/projects in the attic

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: frankrede » Sun Sep 14, 2008 3:39 pm

Once cooled unless the pipe warps while up there it should be fine.
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Unread postAuthor: Velocity » Sun Sep 14, 2008 6:12 pm

Hotwired wrote:
Velocity wrote:However, when the heat goes up to 100 degrees Fahrenheit, the pressure rating of this pipe would be 173.6 degrees Fahrenheit. If the heat got up to 140 degrees Fahrenheit (as starman said it might), the pressure rating would be a mere 61.6 degrees Fahrenheit.


I have this feeling that someones brain and message were not synchronised before posting :P


Yeah, I only got like 5 degrees Fahrenheit of sleep last night, give me a break 8) .
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Unread postAuthor: McThunderThighs » Sun Sep 14, 2008 11:32 pm

Although this is very much after the fact...

I wouldn't worry so much about warping your PVC so much as coming back to a gun that is no longer glued together.

Active chemical cements, like what PVC cement is made from, rapidly decompose in heat. Don't let your guns get above 100deg.F too much unless your are using a better cement made for the heat (you have to order it and it takes 2 days to cure so I know you didn't use it).

Hope that doesn't make you worry too much!
-MTT
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Unread postAuthor: Hotwired » Mon Sep 15, 2008 6:58 am

I don't believe that would be the case MTT.

Cement is the wrong word really it ought to just be called PVC solvent.

After the solvent softens the plastic, the parts are brought together and the polymer chains entangle before the plastic rehardens.

The solvent itself works its way out by passing through the plastic so after a while it isn't even present and the only thing left in the join is just the entangled polymer chains of the two original bits of PVC.
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