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ideas wanted!!!

A place to ask general spud cannon related questions.
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ideas wanted!!!

Unread postAuthor: jook13 » Mon May 05, 2008 1:18 am

so my neighbor is a fire fighter and he is impressed with my spud guns that I have built so far. He has told me that he will have no problem getting me a fire extinguisher canister for no charge. now comes the most important question...

If you got one, what would you do with a fire extinguisher can?

and also, what should I be aware of as far as fittings needed, pressure rated, ect....
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Unread postAuthor: MrCrowley » Mon May 05, 2008 1:44 am

http://www.spudfiles.com/forums/viewtop ... html#56422 :)

As far as fittings, I had to get mine welded because the fittings didn't corrospond, but some fire extinguishers have NPT threads.

Dry Powder extinguishers are rated to 300psi+ IIRC.
CO2 ones are rated over 1800psi I believe.
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Unread postAuthor: BigGrib » Mon May 05, 2008 1:56 am

If I had a fire extinguisher canister, depending on the size of it, I would build a hybrid. As far as fittings, I would just see what you got and deal with it. If you get one with NPT threads just screw in a nipple to a union to a barrel. If you aren't lucky enough to get one with NPT threads then like Mr.C had to do, find a good welder and see if you can't beg him to do a quick weld job for ya. I'm excited to see what you get and what you build with it.
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Unread postAuthor: Gippeto » Mon May 05, 2008 1:56 am

Seems about right.

My Co2 fire extiguishers are rated at 1800psi, and have npt threads.

As for what to do with it, use it as a portable air tank for a refrigeration compressor.

Or,

If they are CO2, get an empty one, and pull the valve out. Install a suitable valve, fill this from a full extinguisher, add a regulator,hose and bleed valve, have fun.

I'm currently shooting my copper gun on 400psi CO2.

Sure beats pumping my a## off. :D
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Unread postAuthor: jook13 » Mon May 05, 2008 1:56 am

well, my buddy says they are rated to 2200 psi or so. guess I will see when it comes in. I will be pretty damn dissapointed if its rated around 300 psi.

It would be sweet if it has standard npt threads though.


anyways, provided it is rated at around 2000 psi, what would you guys do with it? I am deciding between crazy high psi pnuematic or hybrid...

EDIT: damn 2 posts during my reply..... I do have a fridge compressor I could use a tank for, maybe I could get more than one canister....
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Unread postAuthor: Solar » Mon May 05, 2008 2:46 am

Fire extinguishers are usually only 300psi rated(or less). Main problem is cheap, thin aluminum in threaded neck(on many brands). Wears out quick after little use. The tanks actually have a rating that determines if the tank is refillable. I wouldn't bother with non-refillable much. I would make a permanent adapter that you lock-tite into place and use it to thread the rest into.

l would recommend a mini scuba tank at 6 cubic feet of air that is rated to 3000psi and has a 3/4' NPT neck with super burley 6061 aluminum.

You can use one of these as a portable source too.



This is how I like to run. The SCUBA regs are good for around 200psi with decent volume. Set of both can be had cheap. Using a scuba buoyancy compensating vest fitting as a fill nipplee on the launcher allows me to have hot hoses with the air feed lines in nicely rated, pliable hoses and gauges. Try Catalina cylinders or Luxfer.



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Unread postAuthor: Solar » Mon May 05, 2008 2:50 am

Regarding CO2 1800psi cannisters. I couldn't find any that had 3/4" npt in any manageble sizes. Those would still be very useful.
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Unread postAuthor: Gippeto » Mon May 05, 2008 8:59 am

Mine are 5lb'ers with 1/2" npt, and 10lb with what looks to be 1" npt (have not taken valve out to verify on the 10lb).

The brand name is General, made in Canada.

They are out of date, and as such cannot be commercially refilled or recertified. (according to the local fire safety company )

I like that "scuba" setup, what does it weigh?
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Unread postAuthor: OuchProgramme » Mon May 05, 2008 7:10 pm

I've make a super airsoft gun :)

Big Tank=Many shots :)
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