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Burst disk 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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Burst disk question

Unread postAuthor: )DEMON( » Fri Mar 23, 2007 9:18 am

What is the average psi an aluminium burst disk, from a soda can, bursts at?
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Unread postAuthor: jackssmirkingrevenge » Fri Mar 23, 2007 9:46 am

I don't think it will rupture at the sort of pressures used in typical pneumatics, as far as I know people usually use layers of aluminum foil for burst disks. Unless of course you score it with radial lines...
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Unread postAuthor: Insomniac » Fri Mar 23, 2007 7:45 pm

It all depends on the size of the disk. A large disk will hold less pressure than a really small disk.
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Unread postAuthor: lukemc » Sat Mar 24, 2007 7:51 pm

how do people replace burst disks each time? i know how they work from the forums but it dosent say how people change them
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Unread postAuthor: MrCrowley » Sat Mar 24, 2007 8:00 pm

They use a Union. Search it in google for a picture i don't feel like linking you now as my internet is bloody slow.....thats what you get for downloading 12movies at the same time :P
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Unread postAuthor: lukemc » Sat Mar 24, 2007 8:05 pm

oh so they have to unscrew it every shot
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Unread postAuthor: WOW!! » Sat Mar 24, 2007 10:04 pm

Yep they do. And on mine I use 15 layers of foil, works good. And with it you can score it in a X pattern on the can. Might need a hybrid to get though it.
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Unread postAuthor: matti » Mon Mar 26, 2007 9:01 am

i use 2layers of soda can in 50mm union an it takes about 90psi to burst...seat of the burst disc is 42mm!
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Unread postAuthor: )DEMON( » Mon Mar 26, 2007 9:17 am

Thanks! some good data :D

I tried using foil but it was too frustrating and I ended up ripping my burst disk into peices :P
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Unread postAuthor: A-98 » Mon Mar 26, 2007 12:32 pm

i find that the average burst pressure of normal aluminum foil in a 3/4" union is ~15 psi. i use the industrial aluminum foil (about 1.5 times as thick) and that bursts at about 25 psi in the same union.
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