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Need help with burst disc

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Need help with burst disc

Unread postAuthor: xxnelson18xx » Sun Feb 04, 2018 12:09 am

Hello everyone,

Although this is my first post, I’ve been around spud guns for several years. I’ve built several combustion and pneumatic cannons but recently decided to build a hybrid. I’ve constructed it using sch40 steel pipe and will by placing my burst disc in a 1.5” steel union. I’m wanting to use aluminum foil as my disc material. I don’t have a computer that will run HGDT so I’m hoping someone can helo me out. I’m going to be using a 3x oxy/propane mix but need to know how many sheets of foil to use. So basically, can someone tell me in a 1.5” union “x” number of sheets equals “y” psi burst rating?

Thanks for the help!!
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Re: Need help with burst disc

Unread postAuthor: Zeus » Sun Feb 04, 2018 4:48 pm

Short of personal experience, not really. Foil thickness varies from manufacturer to manufacturer. However, you're gonna be looking at a lot. Another option is aluminium barbecue trays, or soft drink/beer cans.

Can you correctly define what you mean by a 3x mix? Will it be pressurised to 3 bar, or are you using 3 times more fuel than a standard air/fuel mix.
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/sarcasm, /hyperbole
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Re: Need help with burst disc

Unread postAuthor: xxnelson18xx » Sun Feb 04, 2018 8:49 pm

I will be using 3x more fuel then will pressurize the chamber to 3 bar
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Re: Need help with burst disc

Unread postAuthor: Zeus » Mon Feb 05, 2018 6:41 pm

3 bar with oxygen, or air
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Re: Need help with burst disc

Unread postAuthor: xxnelson18xx » Tue Feb 06, 2018 3:32 am

I will be using an air compressor
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