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Soda can burst disks.

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Soda can burst disks.

Unread postAuthor: warhead052 » Wed Jun 08, 2011 3:03 pm

What pressure do they rupture at? I was thinking about using some aluminum cans for burst disks (obviously cutting the disks out) and seeing if that would help increase the pressure and velocity of my mortar. I just need to know what pressure they burst at, and if they need a spike to burst them.
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Unread postAuthor: irisher » Wed Jun 08, 2011 3:17 pm

They do not need a spike to rupture but, in order to give a estimate we need to know the diameter.
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Unread postAuthor: warhead052 » Wed Jun 08, 2011 3:17 pm

3/4" and 2". Mostly 2", but I may use them in my 3/4" noob tube.
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Unread postAuthor: Davidvaini » Wed Jun 08, 2011 4:17 pm

warhead052 wrote:3/4" and 2". Mostly 2", but I may use them in my 3/4" noob tube.


the smaller the diameter means you need a higher pressure for the same burst disk material...

so like foil tape will burst at a different pressure on 3/4 than it would on 1.25.. smaller diameter = more pressure needed because of surface area and other more complicated physics.
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Unread postAuthor: warhead052 » Wed Jun 08, 2011 4:39 pm

Thats fine, the rating I have for it is at 480 psi so I can achieve 200 psi without it blowing up with no prob. I just need to know what would work the best, for power and distance for my mortar. I can only get it to about 40 psi till it pops with foil tape, and I need alot more. When my dad gets home tonight he is bringing a dremel, and I will sand down one side of the coupler so I can have more layers.
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Unread postAuthor: hi » Wed Jun 08, 2011 10:52 pm

at 3/4 inch i bet you would need a lot of pressure, my guess is at least 150.
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Unread postAuthor: jackssmirkingrevenge » Wed Jun 08, 2011 11:58 pm

A single layer of photo paper can take over 75 psi in my 3/4" hybrids, I reckon aluiminium sheet can take a bit more than that to burst...
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Unread postAuthor: warhead052 » Thu Jun 09, 2011 9:56 am

Ok. Well I will be testing soon, maybe tonight. I will let you guys know the results. Oh and I tried grocery bags, and I fractured my 2 inch coupler thats how powerful it was. I guess I got a few new ones...
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Unread postAuthor: CpTn_lAw » Thu Jun 09, 2011 3:51 pm

I can tell you, a soda can burst disc in a 1/2" union won't burst @ 8x with my hybred if not scored in some way.
So...3/4" is bigger, i guess less pressure then....but hey, i think you're good to at least 400 psi.

For that 2" one....100 psi? maybe less
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Unread postAuthor: Crna Legija » Thu Jun 09, 2011 9:37 pm

i made a to pneumatic burst disc just lots of noise, had no barrel but with roughly a 20mm port alu cans sides where bursting at just under 200
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