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Metal union for hybrid

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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Metal union for hybrid

Unread postAuthor: Mini Khan » Sat Jun 24, 2006 3:26 pm

do they have 2 inch metal unions because i was thinking about diong a hydrsogen oxogen hybrid that would hopefully peak 500 psi and the best part is that if I get it from water it would already be a perfect mix so I would not need like three pressure gadges and mabey use like sheet metal for a birst disk.
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Unread postAuthor: cannon freak » Sat Jun 24, 2006 5:00 pm

If you plan on getting the hydrogen from water you could get a perfect mix, however to mass produce even samal amounts of hydrogen takes a while, and if you are not going to add anything to it such a salt, or even hydroxide(I think its hydroxide any way) its going to take forever, if you do add them though you will have to add your own oxydizer, since you will not get pure oxygen from the electroylosis.
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Unread postAuthor: SpudStuff » Sat Jun 24, 2006 5:31 pm

you arent very smart. that will be like a bomb even if you use metal piping. its not the total pressure it is the shock from the combustion
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Unread postAuthor: benstern » Sat Jun 24, 2006 6:07 pm

Basiclly a grenade.
Hydrogen detonates instead of combusting. (flamefront speed > mach 1)
We all know that we don't wan't to put something that detonates in a confined space then set it off.
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Unread postAuthor: drac » Sat Jun 24, 2006 6:10 pm

I suggest that if you can't spell hydrogen and oxygen, you shouldn't attempt it at all.

Cannon freak, you are absoluely correct. Actually, any ionizing agent can be added because of it's electrolytic properties. Strong bases or acids such as HCl or NaOH (hydrocholric acid and sodium hydroxide, known commonly as lye) are best because of their high ionization in water. As long as its an ionic compound, it will work, but some are better than others.

Spudstuff... metal should be able to handle the shock of the combustion, BUT over time it will fail.


Now to answer the question, yes.... there are 2 inch unions in metal, but they're heavy as hell and tend to chop burst disks.
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Unread postAuthor: boilingleadbath » Sat Jun 24, 2006 6:12 pm

"chop burst disks"
Eh? What is ment by that?
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Unread postAuthor: Rambo » Sat Jun 24, 2006 11:19 pm

Hydrogen hybrid won't have any ignition problems.From NaOH and wather you will get the prefect mix but some of the O2 will disolve the electrodes.From NaCl you will get the prefect Cl2 H2 mix but it's even harder for the electrodes unless they are platinium.Graphite works well.You may take tick one from cheap and big bettery.
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Unread postAuthor: djt » Sat Jun 24, 2006 11:33 pm

i have taken them from a hobby battery before. and like cannon freak i also know how long it takes. were talking like five minutes for a small test tube full of hydrogen and i mean small. of course thats with a nine volt...you could go larger scale i guess but i dont think its worth it.
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Unread postAuthor: drac » Sun Jun 25, 2006 7:18 am

boilingleadbath wrote:"chop burst disks"
Eh? What is ment by that?


Because the sealing face is tapered, whenever i put my birst disk in it tended to slice the disk. As to results with plastics, I wouldn't know. I've only used aluminum foil and masking tape.

Is that a sufficient answer? :P
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Unread postAuthor: boilingleadbath » Mon Jun 26, 2006 1:44 pm

Ah, ok.

As to plastics, I'v been using HDPE (milkjug) burstdisks in a device I won't declare the specifics off. This is using a 3/4" black iron union.

Although I think the sharp edge lowers the pressure at which the burstdisk ruptures, it seems to work pretty well, giving VERY clean bursts... One could possibly flip the union so that the edge is pointing away from the pressure side, which would probably increase the burst pressure.

No quantitative information on pressure, however.
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Unread postAuthor: ohspyro89 » Thu Sep 21, 2006 4:33 pm

Ive got a 2.5" union thats rated to 3k psi i beleive. aim me at ohspyro89 or something...


Anyway, the whole hydrogen thing really is something I dont know if I would mess with. Do TONS of research and dont be cheap...
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Unread postAuthor: LGM » Tue Feb 13, 2007 7:26 pm

Yea, I know, dead topic. But would a hydraulic cylider hold up to this pressure? They are rated to several thousand PSI and in some applicatons they need to withstand shock. I am asking this because I was thinking of making a hybrid out of one of these and wanted to use hydrogen.
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