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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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Unread postAuthor: Crna Legija » Thu Jul 19, 2012 5:54 am

jsefcik wrote:
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



well from the copper hand book
1/2'' annealed pipe 781 psi at 100f
1/2'' drawn pipe 1341 at 100f

quite a bit of difference, if you over heat copper drawn pipe it becomes annealed so you use the annealed rating.


Im guessing its fine for refrigeration because its small dia tube used at low pressure for the tube.
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Crna Legija
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Unread postAuthor: Zeus » Thu Jul 19, 2012 7:49 am

Considering the pipe wall thickness and the average working pressures of fridges, annealing the pipe won't reduce the pipe's safety rating to an unsafe point, and brazing is a more solid mechanical joint, which is more important in a device that the end used can bugger around with.
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