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I have MAPP gas tied to a small accumulator. Upon pressing a button I can release gas...but it comes out in a stream rather than a gas ball "explosion". The gas orifice has to be on the smaller side (1/4" opening).
Is there any way to get a small gas "ball" explosion like I get on my 3/4" orifice fire poofer?
Is there any way to get a small gas "ball" explosion like I get on my 3/4" orifice fire poofer?
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Los Angeles
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Re: Gas fire "ball" explosion
Mon, September 21, 2009 - 12:46 PMHmm, what if you played around with ignition delays?
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Re: Gas fire "ball" explosion
Mon, September 21, 2009 - 11:18 PMWhy MAPP?
In my experience, it is hotter, more volatile, dimmer in color, and more expensive.
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Re: Gas fire "ball" explosion
Tue, September 22, 2009 - 4:10 PMIt is a Fire puppte so the "ignition" is on all the time (his hands) I have switched baclk to just propane instead of MAPP upon really looking closely at both gases...
Any idea how to slow down the gas so I get an "explosion" rather than a jet? -
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Re: Gas fire "ball" explosion
Sat, September 26, 2009 - 3:02 PMHow about this idea:
First regulate the pressure down to something low. Maybe use a standard gas grill style regulator, which is 11" WC (about 0.5 PSI). Then run the propane into a pair of valves in series with a short section of pipe between them. I'm thinking electric solenoid valves a couple of inches apart, but you could also use manual valves to test the idea. To charge the system, you close the second valve and open the first valve. This fills the short pipe section between the valves with a fixed small amount of gas at your regulated pressure. Then close the first valve so that both valves are closed. When ready for the effect, open only the second valve to release the small amount of propane. Repeat as necessary, using the pipe between the two valves to measure out small quantities of gas a low regulated pressure.
You'd need an electric ignition or a separate pilot flame to ignite the effect.
fuel --> regulator --> valve #1 --> valve #2 --> output
good luck!
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Re: Gas fire "ball" explosion
Wed, September 30, 2009 - 9:02 PMI believe the explosion is due to initial rapid mixing of the gases, and delayed ignition reaching the portion of the fuel that's well mixed w/ air. I would make sure to use smooth bore tubing of 3/8" or 1/2" outside diameter after the valve, and use large pipe (3/4" or so) just prior to it. This will help insure very rapid gas velocities just after valve opening. Also, use a direct acting valve rather than a piloted one; they're much faster acting.
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Re: Gas fire "ball" explosion
Wed, October 14, 2009 - 7:57 PMWhat if you "played around" with multiple dispersion nozzles? It sounds to me like you are looking to make a concussive cannon of some sort and you want an FAE, not a simple release of inefficiently combusted gas. Try adding a wee tiny bit of O2 or make the dispersion much more fine with more atmospheric oxygen in the mix. Of course, I'm a lunatic and you likely wouldn't wish to listen to what I have to say on the matter. -
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Re: Gas fire "ball" explosion
Fri, October 23, 2009 - 10:28 AMwonderful, i'll give it a go. -
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Re: Gas fire "ball" explosion
Sun, October 25, 2009 - 4:57 PM -
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Re: Gas fire "ball" explosion
Sun, October 25, 2009 - 5:10 PMoh... words of caution
don't mix the propane and O2 in a closed section of pipe between valves......Extremely high pressures can result from ignition causing a lot of damage. FOGBANK uses an open mixing chamber and sparkplugs
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Re: Gas fire "ball" explosion
Wed, October 28, 2009 - 9:37 PMNo shit! I would never mix gasses before they reach the combustion chamber itself and it should be very open on one end, unless you're a big fan of shrapnel.
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Re: Gas fire "ball" explosion
Wed, October 28, 2009 - 9:44 PMHell, I've seen a simple plastic 2 liter coke bottle detonated that was filled 50/50 with pure O2/acetylene. It quite literally detonated, ripped the bottle to shreds (did not melt it), and produced a concussive force that could be felt about 25 feet away. With the proper mix of 02 a FAE has real potential. I'm surprised there is no military weaponry that utilizes such a cheap abundant fuel source to, say, propel artillery shells.
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