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copper cannon question

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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copper cannon question

Unread postAuthor: mr.potatohead » Tue Jul 17, 2012 4:47 pm

im making a copper cannon and i must solder all the joints is there a way to make the joints where i soldered stronger and what psi may i go up to it is a coaxial canon
also
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Last edited by mr.potatohead on Tue Jul 17, 2012 5:17 pm, edited 4 times in total.

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Unread postAuthor: killerbanjo » Tue Jul 17, 2012 4:54 pm

As long as you solder well you do not need to make them stronger... Depends on the copper but i think most copper is rated for about 120psi. I know BtB went to about 300psi with copper but said it felt very nasty... Im sure 200psi would be ok and 240psi is pushing it.
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Unread postAuthor: sagthegreat » Tue Jul 17, 2012 5:01 pm

copper is rated for atleast 500psi, more if its type L. But when your done, start shooting at 100 psi, and bring your way up. stop were u feel safe.
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Unread postAuthor: mr.potatohead » Tue Jul 17, 2012 5:09 pm

i thought copper could hold more
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Last edited by mr.potatohead on Tue Jul 17, 2012 5:18 pm, edited 1 time in total.

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Unread postAuthor: jsefcik » Tue Jul 17, 2012 5:09 pm

as long as you have good joints, in school we hooked when up and pumped it up to 600 psi, but im not recommending it, stop when you think its good enough
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Unread postAuthor: killerbanjo » Tue Jul 17, 2012 5:19 pm

i would not trust plumbing copper at 600 psi... I would be shitting myself.
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Unread postAuthor: Gippeto » Tue Jul 17, 2012 6:57 pm

Read...

http://www.google.ca/url?sa=t&rct=j&q=c ... wB3yLmPGBQ

Tube ratings start on pg 25. Pay special attention to the note found on the bottom of page 27.

Joint ratings for various solders/brazing alloys are on page 28.
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Unread postAuthor: jsefcik » Tue Jul 17, 2012 10:08 pm

killerbanjo wrote:i would not trust plumbing copper at 600 psi... I would be shitting myself.


its was pretty neat actually, but then we let all the pressure out, but we did hook a soda bottle up and start pumping =)

that was awesome!!
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Re: copper cannon question

Unread postAuthor: Crna Legija » Wed Jul 18, 2012 3:45 am

mr.potatohead wrote:\ what psi may i go up to


that all depends on what type off copper pipe you the size, what solder you use, and of course how well you solder the joints.
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Re: copper cannon question

Unread postAuthor: jsefcik » Wed Jul 18, 2012 8:23 am

Crna Legija wrote:
mr.potatohead wrote:\ what psi may i go up to


that all depends on what type off copper pipe you the size, what solder you use, and of course how well you solder the joints.



That is very true,, if you braze it you can with stand higher pressures
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Re: copper cannon question

Unread postAuthor: Gippeto » Wed Jul 18, 2012 9:21 am

jsefcik wrote:That is very true,, if you braze it you can with stand higher pressures


See my previous post...try reading it too. :roll:
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Unread postAuthor: mattyzip77 » Wed Jul 18, 2012 1:47 pm

Hooked on Phonics worked for me!!!!!
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Re: copper cannon question

Unread postAuthor: Crna Legija » Thu Jul 19, 2012 4:12 am

jsefcik wrote:That is very true,, if you braze it you can with stand higher pressures


that could lower it because it heats up the pipe to much witch makes it weaker.
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Unread postAuthor: Zeus » Thu Jul 19, 2012 4:47 am

Yeah, brazing will anneal copper, due to the temperature involved, whereas soldering doesn't usually get to those temperatures.
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Unread postAuthor: jsefcik » Thu Jul 19, 2012 5:27 am

Zeus wrote:Yeah, brazing will anneal copper, due to the temperature involved, whereas soldering doesn't usually get to those temperatures.



brazing is alot better, higher pressures, your safer, look at refrigeration lines those are all brazed
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