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"Burst Disc" safety device?

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 Disc" safety device?

Unread postAuthor: boyntonstu » Wed Mar 17, 2010 11:09 am

You build a steel pipe cannon and pressurize it to 1500 psi.

You mount a copper cap/burst disk in a position that blows away from you if it bursts.

IOW A copper circuit breaker for air pressure.

I imagine that splitting copper is a lot better than shattering steel.

Has anyone photos or videos of bursting steel and/or copper?
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Unread postAuthor: nosnik » Wed Mar 17, 2010 11:24 am

1500 psi??? :O your scary :shock: (im afraid of 120psi already ) :cry:
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Unread postAuthor: metalmeltr » Wed Mar 17, 2010 11:25 am

This is an interesting idea, however i think that the copper bursting could send hazardous shrapnel out if it bursts. I know that C02 tanks use a burst disc to prevent overpressurization, but I don't know what material they use. Is there not a commercially available pressure relief valve that will work in your operating range?
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Unread postAuthor: joepage2008x2 » Wed Mar 17, 2010 11:37 am

What is 1200psi for?
I know that brass is a very common material for burst disks - I think thats what is used with the little CO2 cartridges.
Pressure release valve is probably the safest option but I imagine them to be an expensive part if bought commercially because they are uncommon.
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Unread postAuthor: Gippeto » Wed Mar 17, 2010 11:48 am

I believe the burst discs on "paintball" type tanks are copper.

You can get a relief valve (poppet style) for 1200psi...I've one in front of me set at 1500psi. :twisted: (needed model #)

http://www.swagelok.com/search/product_ ... S-4R3A5-BU

Not cheap though...I think when I last priced one out it was ~$150cdn buying it through the business.

A phone call would be in order.
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Unread postAuthor: boyntonstu » Wed Mar 17, 2010 12:41 pm

Gippeto wrote:I believe the burst discs on "paintball" type tanks are copper.

You can get a relief valve (poppet style) for 1200psi...I've one in front of me set at 1500psi. :twisted: (needed model #)

http://www.swagelok.com/search/product_ ... S-4R3A5-BU

Not cheap though...I think when I last priced one out it was ~$150cdn buying it through the business.

A phone call would be in order.


My thinking is to make everything homemade if possible.

If a copper cap fitted to a short length of copper tubing would burst before the steel cannon to which it is attached, wouldn't that be sufficient?


BTW What do you use to pump high pressures?
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Unread postAuthor: metalmeltr » Wed Mar 17, 2010 12:44 pm

Most peple use a shock pump or comressor from a refigerator for high pressure. I personally feel that your idea of a piece of copper pipe with a cap is far too dangerous to serve as a safety device.
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Unread postAuthor: boyntonstu » Wed Mar 17, 2010 1:06 pm

metalmeltr wrote:Most peple use a shock pump or comressor from a refigerator for high pressure. I personally feel that your idea of a piece of copper pipe with a cap is far too dangerous to serve as a safety device.


????

"I believe the burst discs on "paintball" type tanks are copper. "

What is the difference?
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Unread postAuthor: metalmeltr » Wed Mar 17, 2010 1:26 pm

Maybe I am misunderstanding how the copper would behave when it bursts, but i see shrapnel everywhere.
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Unread postAuthor: Gippeto » Wed Mar 17, 2010 1:36 pm

Stu, you can buy a burst disc at Walmart for a couple bucks. The difference is the thickness and diameter of the copper disc....and the fact that they are a KNOWN quantity.

To use them, you would need to drill and tap appropriately, as they do not use a tapered pipe thread, but seal on the lower edge....metal to metal.

If you decided to make one, the best idea I can suggest at the moment, is a pipe union (1/8"npt) fitted with foil discs. You'll need to experiment with it to determine how many disks you'll need, and I would suggest placing a pipe plug in the downstream end of the union to protect the disks from accidental damage.

Hydrostatic testing is to be preferred.

You will of course have to drill a small (1/8") hole through the pipe plug to allow any gas to vent.

Be very careful (should go without saying...but others read these posts too :roll: ) with the direction of venting as well.
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Unread postAuthor: turner » Wed Mar 17, 2010 7:29 pm

http://paintballgateway.com/burstdiscs.html
they should be 1/8 npt. the fill nipple and gauges are 1/8 npt. i dont see how they seal any other way besides Teflon tape because the paintball regs are rounded
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Unread postAuthor: twizi » Wed Mar 17, 2010 7:40 pm

paintball burst disk for a 3000hpa tank or 4500 usally burst at 5000psi
they are made from brass and believe me u dont want to be near a 4500psi carbon fiber tank when it burst or when it explodes because some dumbass puts triflow in the fill nipple
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