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Manometric metering help

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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Manometric metering help

Unread postAuthor: Dave_424 » Sun Nov 02, 2008 5:03 pm

I was wondering if this would be a good setup for metering my paintball tank hybrid:

paintball tank => threaded to a 1/4" ball valve => 1.4" tee with a gauge at the top and a male quick connect at the back

What range of pressure for the gague would I want??? 0-1 BAR ect.

Also if you have a better idea for setting up all of the fittings just give a suggestion

Thanks Dave
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Unread postAuthor: ALIHISGREAT » Sun Nov 02, 2008 5:11 pm

for the guage it depends on the maximum mix number, so for 5x you could get a 0-4 bar guage.
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Unread postAuthor: Dave_424 » Sun Nov 02, 2008 5:15 pm

because I would only really use my compressor (8 BAR) which means a maximum mix of 9

I would only prorably only use about 5 or 6 mix but would like the 9x mix capability

Would This mean that I would have the buy the 0-7 BAR gague from airlines-pneumatics? would it be reliable to read the correct PSI at the lower pressures for lower mixes?

Dave
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Unread postAuthor: DYI » Sun Nov 02, 2008 5:18 pm

A 0-15 psig fuel gauge is adequate for mixes of up to 20x, or thereabouts. You can buy +/-1% accuracy ones from McMaster-Carr.
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Unread postAuthor: Dave_424 » Sun Nov 02, 2008 5:27 pm

How would a 0-15 PSI gague work?

OOOOOOOH would I just use the 0-15 PSI gague for adding the propane to the chamber, But how would I know the PSI that I would be adding from the compressor? Set the regulator for that mix?

If anyone could clear this up it would be a great help

DAVE
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Unread postAuthor: Fnord » Sun Nov 02, 2008 5:57 pm

Alihisgreat gave you some fuzzy or inaccurate info, but DYI got it right.

For a 20x mix, you'd need about 15 psi of propane pressure on the gauge, or one chamber volume of propane. For 9x, you'd want about 7 psi, maybe a little less. You'll need to add the propane pressure to the total air pressure you're going to add, otherwise your mix will be off a little.
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Unread postAuthor: SpudFarm » Sun Nov 02, 2008 6:09 pm

no need for the expensive gauges. mine works a treat with a cheap one (0-1bar)
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Unread postAuthor: Dave_424 » Sun Nov 02, 2008 6:17 pm

I have decided on how I am going to do this

chamber => 1/4" ball valve => 1/4" tee => 0-11 BAR gague on top => on end a male quick connect (This is the set up for oxidizing) then for the fueling

Female quick connect => 1/4" tee => 0-1 BAR gague on top => propane source

Dave

Anyone know where to get the propane tank hreads - 1/4" adapter?
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Unread postAuthor: Larda » Sun Nov 02, 2008 8:25 pm

I used a single 5000PSI +-0,02% digital gauge to meter both the propane and the air for my hybrid, (0-20% of full scale= +-0,02%, 20-100%full scale=+-0,1% of reading).
I have used it from as low as 5x up to 200x without a problem.
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Unread postAuthor: SpudFarm » Mon Nov 03, 2008 9:37 am

Dave_424 wrote:Anyone know where to get the propane tank hreads - 1/4" adapter?


i just went out to a little pipeshop "a really SMALL one!" and brougth my propane tank and said "do you have a fitting so i can get 1/4" threads on this tank?" it is a pretty normal part around here and they will almost certainy have it ;)
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Unread postAuthor: Dave_424 » Mon Nov 03, 2008 11:30 am

So would B&Q have the right fitting?

Anyone know of a place online to get one? i can't find one anywhere.

Dave
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Unread postAuthor: psycix » Mon Nov 03, 2008 6:07 pm

Dave you could also use two different gauges: a low one for measuring fuel precisely, and a high one for measuring the air pressure.
Make sure to use a ballvalve to protect the low pressure one from higher pressures.


@ Larda,
And what would one pay for such a beauty hmm?
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Unread postAuthor: Dave_424 » Mon Nov 03, 2008 6:24 pm

Yes Psycix in a post a bit above I have a 0-1 BAR gague on the detatchable fueling meter and then a 0-11 BAR gague permanantly attached to the chamber, with a isolating ball valve of course :P

Anyone else with an idea to get an adapter in the UK for a propane tank to 1/4" threads?

Dave
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Unread postAuthor: ALIHISGREAT » Tue Nov 04, 2008 2:33 am

you could probably get an 8mm compression fitting on there which i think has 1/4" threads, you really need to get hold of your propane tank first, then its a case of whatever fits.

i thought about sticking the lever locking schrader adapter off a pump on the tank then i could easily fill through cored shcrader.
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Unread postAuthor: SpudFarm » Tue Nov 04, 2008 2:51 pm

psycix wrote:@ Larda,
And what would one pay for such a beauty hmm?


from MY memory it was about $900 or $250...

pretty sure it was the 900 one.

i also think that it is the kind of gauge that does 5000 readings per second :D
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