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Source for unregulated propane fitting

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: MountainousDew » Thu Jun 18, 2009 3:51 pm

D_Hall wrote:I do NOT want regulated propane. I'll be injecting it at full 250 psi (or whatever nominal pressure is).

110 psi on a hot day...
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Unread postAuthor: Technician1002 » Thu Jun 18, 2009 4:56 pm

D_Hall wrote:I do NOT want regulated propane. I'll be injecting it at full 250 psi (or whatever nominal pressure is). I want a high energy gas flow to maximize turbulence (purpose: improved mixing of gases). Fuel measurement will simply be via high accuracy pressure gages. As in....

Step 1) Fill chamber to X.XX psi with propane.
Step 2) Fill chamber to Y.YY psi with air.


Edit: Oh, and DOT need not apply. I may be portable, but as I will never be on a public road with propane in the system, DOT regs do not apply.


DOT does apply to how you carry your propane. Approved container etc. Disconnected, fastened down, vented outside, etc. You should be good.

110 psi on a hot day...


hot day?

Image

Warm day maybe at about 70 F.
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Unread postAuthor: D_Hall » Thu Jun 18, 2009 6:20 pm

It's over 100 F outside right now. :)
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Unread postAuthor: MountainousDew » Thu Jun 18, 2009 6:21 pm

Sorry, my bad...
110 psi on an average day.
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Unread postAuthor: chenslee » Wed Jun 24, 2009 9:41 pm

Hey d_hall, did you ever find that fitting? If not, I think I may have two laying around..

Image

Image

...it's the standard 5lb tank fittin that is screwed into this regualtor. I removed the fitting and used the reg, and the fitting is garbage to me.

Let me know if you want it, pay for shipping and it's yours.
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Unread postAuthor: mark.f » Thu Jun 25, 2009 5:29 am

Well, do you have six of them? :lol:

Also, why not use a large tank used for supplying a house? Like an AmeriGas tank? Wouldn't be as simple as stopping by Home Depot to get a refill, but you can get a refill the way the rest of America does. I'm sure it wouldn't be a problem...
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Unread postAuthor: THUNDERLORD » Thu Jun 25, 2009 10:23 am

Not sure if it's safe, (edit: could be very dangerous???)
But with the rate propane pressure increases with temperature,
I was wondering about putting one of those chemical hand warmer packets inside the chamber before a spudding session(???)

There are also warmer packs in MRE's usually. 8)
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Unread postAuthor: chenslee » Thu Jun 25, 2009 4:18 pm

I bet those hand warmers off-gas CO2.

I'm not sure if the POL fittings I snagged off my regs have the over flow safety feature.

If D_Hall's project requires 6 x 5lb tanks chained together, we are all in serious trouble. 6 x 1 lb tanks chained I can understand....
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Unread postAuthor: THUNDERLORD » Thu Jun 25, 2009 5:51 pm

chenslee wrote:I bet those hand warmers off-gas CO2....


I was thinking of pneumatic use with PVC...IDK what temp. they heat to or how the chemicals would interact with propane (yet)...

The MRE one's need water to start the reaction...so no good for combustion/hybrid use.
IDK exactly what chemical reaction is involved...I know when most acids are combined with organic substances a good deal of heat is released...
There was an old jet-pack design that used reactionary forces rather than flammability IIRC...Would create a new terror source [weapon] if coupled with a cloud /vortex though... :twisted: 8)

My only PVC pneumatic launcher right now has a threaded female - male fitting for varying chamber size, and I could unscrew the end-cap and insert a pocket warmer easily for propane fills...haven't tried it yet... 8)
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Unread postAuthor: Technician1002 » Thu Jun 25, 2009 7:45 pm

THUNDERLORD wrote:
chenslee wrote:I bet those hand warmers off-gas CO2....


I was thinking of pneumatic use with PVC...IDK what temp. they heat to or how the chemicals would interact with propane (yet)...


My only PVC pneumatic launcher right now has a threaded female - male fitting for varying chamber size, and I could unscrew the end-cap and insert a pocket warmer easily for propane fills...haven't tried it yet... 8)


Just a quick note on hand warmers. The iron oxide ones consume oxygen.. not good for your mix. EDIT, they don't oxidize carbon, so no CO2. They do oxidize iron, so less oxygen.

http://www.scienceiq.com/Facts/WarmerHands.cfm
When the iron in the warmer is exposed to oxygen in the air, it oxidizes. In the process of doing so, heat is created. The salt acts as a catalyst and the carbon helps disperse the heat through the warmer. The vermiculite acts as an insulator, keeping the heat from dissipating too rapidly, while the polypropylene helps the air to mix with the ingredients while holding in moisture.


The reusable ones that reactivate by boiling, would work fine and use no oxygen.
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Unread postAuthor: chenslee » Thu Jul 02, 2009 10:20 am

The POL fitting on the reg that I posted above DOES have the over-flow ball. I scored an empty 5lb tank last night and hooked it up. This new tank was pressurized with air (weird) and as soon as I turned it on, the over-flow locked up.

6 minutes later after attacking it with a pair of spring clip pliers, a blowtorch and a crimper, I had that ball out. I'll probably write a how-to about getting the over-flow ball out of a POL fitting.
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Unread postAuthor: D_Hall » Sat Jul 04, 2009 1:18 pm

chenslee wrote:This new tank was pressurized with air (weird)

Not weird at all. 'Tis a bad idea to leave a pressure vessel unpressurized. You always want at least a few psi in them. So...easiest/safest pressurant gas for a new tank? Air, of course.
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Unread postAuthor: Technician1002 » Sat Jul 04, 2009 2:39 pm

D_Hall wrote:
chenslee wrote:This new tank was pressurized with air (weird)

Not weird at all. 'Tis a bad idea to leave a pressure vessel unpressurized. You always want at least a few psi in them. So...easiest/safest pressurant gas for a new tank? Air, of course.


Air often has Oxygen and Water. Not good in a new tank.
Dry Nitrogen is most often used.

Pressurize with Nitrogen is common and considered safe to transport by truck, rail, etc. The low pressure used is considered safe. This reduced pressure Nitrogen is often left in the tank after high pressure Nitrogen testing the tank and relief valve.

EDIT, found a reference on this initial air, Nitrogen, or other gas. The article is on proper purging of this gas to fill it with Propane. I do stand corrected. Dried air is sometimes used.
http://home.earthlink.net/~derekgore/rvroadiervfulltimingwhatisitreallylike/id45.html
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