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custom propane tank

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: Fnord » Wed Jun 13, 2007 7:59 pm

I have some 2" galvanized conduit pipe, and it is thicker than a dot-39 tank(the most common green propane tank in this area).

You would be better off with brass/steel if you dont mind spending more.
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Unread postAuthor: noname » Wed Jun 13, 2007 8:39 pm

Fnord, I'll bring my camera to Ace next time I go and take a picture of the price tag. Yes, it's that much. :?
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Unread postAuthor: turbohacker » Wed Jun 13, 2007 8:48 pm

For your liquid propane problom I would suggest putting a smaller tank above the liquid filled one, when you open a ball valve than the gas will expand before it gets to the regulator
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Unread postAuthor: meatballs » Wed Jun 13, 2007 9:28 pm

good idea, turbohacker, i'll probably try that. and for the tank, i'm probably just going to use a half inch galvanized steel nipple, a few inches long, which is only going to cost like five to ten dollars, including the fittings, so its actually not that bad. im bussy now with finals, but school gets out monday so then i'll be able to try this out.

oh and i just remembered another idea i had, what if i used some sort of clear tubing so i could see how much propane was left? is there some such tubing that i could trust to hold the pressure over somewhat extended periods of time? like that stuff with crisscrossing nylon reinforcing fibers in it? there's got to be something. and then you could always see exactly how much you have left, which would be really cool.
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Unread postAuthor: sandman » Thu Jun 14, 2007 6:44 am

wait, how do you plan on seeing a gas?
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Unread postAuthor: chaos » Thu Jun 14, 2007 6:55 am

sandman wrote:wait, how do you plan on seeing a gas?


Propane at temperatures >100C is a liquid under compression if he used clear materials for the cylinder he would see "liquid propane"
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Unread postAuthor: sandman » Thu Jun 14, 2007 6:59 am

but how would you get it cold enough to see how much is in there if you already used most of it?

well, in my opinion this is not needed, just use till it willnt fire
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Unread postAuthor: meatballs » Thu Jun 14, 2007 11:44 am

i know you can see the liquid propane, i've had it get in the tube that goes to the regulator, and you can see it in there. and until you run out of liquid, the pressure in the tank remains constant. and it wouldn't have to be cold, just under pressure, varying from about 75 psi at 50ºF (10ºC) to 175psi at 100ºF (38ºC). i dont think the temp would get beyond that range, and if anything it would get colder than that which wouldn't be a problem in terms of tubing being able to hold the pressure.
sooo...back to the original question: is there some sort of tubing that would work for this while providing a visual on how much propane is left?
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Unread postAuthor: chaos » Fri Jun 15, 2007 5:40 am

chaos wrote:
sandman wrote:wait, how do you plan on seeing a gas?


Propane at temperatures >100C is a liquid under compression if he used clear materials for the cylinder he would see "liquid propane"


sandman wrote:but how would you get it cold enough to see how much is in there if you already used most of it?



did i not explain it enuf for you?

meatballs there is a way to do it im sure of it, i mean find out the chemical resistance of clear pvc... thats it done there. sch80 clear pvc IF it can withstand the chemical properties of propane should be fine.
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Unread postAuthor: VH_man » Fri Jun 15, 2007 6:51 am

try that reinforced Vinyl tubing........ that would actually be pretty cool to see liquid propane inside your chamber.......
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Unread postAuthor: meatballs » Fri Jun 15, 2007 11:11 am

does anyone know anything about the chemical resistance of clear reinforced vinyl tubing?
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