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How much pressure will this chamber take?

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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Unread postAuthor: Dave_424 » Tue Jun 23, 2009 2:47 pm

Alright, the correct drill size for 1/4" BSP is 11.8mm

The bottom of the cylinder is actually quite thick. At least 10mm so I think there will be enough threads

I could either fill the cylinder with water and it up, greatly reduced stored energy but still not 100% safe

Or have to buy some fittings (And a very expensive 3000+ psi gauge) to use the grease pump

Dave
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Unread postAuthor: Dave_424 » Tue Jun 23, 2009 3:00 pm

Sorry for the double post but here is a picture of the thickness of the steel cylinder

Image

EDIT: Working from a 12mm hole, at the 1600 psi peak pressure from a 15X mix, there is approx 280 pounds of force which I feel comfortable with

Dave
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Unread postAuthor: Technician1002 » Tue Jun 23, 2009 3:54 pm

Dave_424 wrote:Sorry for the double post but here is a picture of the thickness of the steel cylinder

Image

EDIT: Working from a 12mm hole, at the 1600 psi peak pressure from a 15X mix, there is approx 280 pounds of force which I feel comfortable with

Dave


The steel is thicker at the neck. Look online for cut away views of high pressure tanks.
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Unread postAuthor: Hotwired » Tue Jun 23, 2009 3:54 pm

twizi wrote:gippeto i think he would use water but he would force the water in the tank with air to compress the water

Best of both worlds, the mass of the water propelled by the energy storage of the gas.

Strange things happen to objects when they meet a thin jet of water being chased out by 3000psi.
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Unread postAuthor: Dave_424 » Tue Jun 23, 2009 3:55 pm

That is the hole that I am tapping, I am not worrying about te cylinder walls, Just showing that there is sufficient material to hold the threads safeley

Dave

EDIT: Okay then, I will only use water/grease to pressurise the chamber
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