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Oh no! A leaky propane meter

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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Oh no! A leaky propane meter

Unread postAuthor: noname » Sat Mar 10, 2007 3:00 pm

Just a couple pics of my propane meter on fire. I need some more teflon tape on there. :?
The meter is a 3 foot long piece of 3/4" galvanized.
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Unread postAuthor: pyromaniac » Sat Mar 10, 2007 3:20 pm

What im about to say is contreversial. Sweet! i like fire! Also o crap thats on fire. did you light it on fire on purpose?
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Unread postAuthor: mopherman » Sat Mar 10, 2007 3:23 pm

pyromaniac wrote:What im about to say is contreversial. Sweet! i like fire! Also o crap thats on fire. did you light it on fire on purpose?

lol my buddie here has fire issues
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Unread postAuthor: MrCrowley » Sat Mar 10, 2007 5:13 pm

Smooth :P
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Unread postAuthor: Pete Zaria » Sat Mar 10, 2007 5:20 pm

I use a lighter to leak-test my propane meter, too ;)

Use 2-3 wraps of teflon tape on each threaded connection. When wrapping the teflon, wrap it in the same direction that the fitting will thread on - that way when you screw on the fitting, it doesn't take off the teflon.

I've occasionally had a brass fitting that won't hold 120psi (max a propane tank will put out, in my experience) no matter how much teflon you use. In that case, I just put a teeny bit of clear epoxy or superglue on the bottom of the threads, and screw it in. It'll never come back out, but it won't leak either....

Leak testing the entire thing in a bath tub before installing it on the gun is probably a good idea.

Peace,
Pete Zaria.
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Unread postAuthor: Killjoy » Sat Mar 10, 2007 5:27 pm

I was trying to pressure test my solinoid valve operated meter with propane. And the spark from connecting the battery to the valve caught a propane leak (which was like every connection, which had been leaking for like 1 minute at 120 psi). As you can guess i was engulfed in a flameball. Sustained minor burns and got yelled at for being stupid at 1am and setting part of the garage on fire. Since then i use a little dawn and water to check for leaks (and compressed air for pressure testing), if bubbles start to form and grow, its leaking. I also use liqiud teflon tape, which works wonders with leaks.
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Unread postAuthor: noname » Sat Mar 10, 2007 10:51 pm

I always use teflon tape on any threaded fittings, but evidently I didn't use enough.
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Unread postAuthor: Insomniac » Sat Mar 10, 2007 10:55 pm

I thought when teflon buned it gave out toxic fumes (yes I know its the propane burning and not the teflon, but the teflon is still engulfed in flames)
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I wonder how much deeper the ocean would be without sponges.
Right now I'm having amnesia and deja vu at the same time. I think I've forgotten this before.

Add me on msn!!! insomniac-55@hotmail.com
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Unread postAuthor: noname » Sat Mar 10, 2007 11:12 pm

I wouldn't doubt it, that's why I opened my garage door. :D
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Unread postAuthor: willarddaniels » Sun Mar 11, 2007 12:59 am

I guess that is one way to test for leaks...
I also use liquid tape on all my fittings where compressed gasses are concerned.
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Unread postAuthor: SpudBlaster15 » Sun Mar 11, 2007 2:19 am

You have to use alot more teflon tape than it would seem to completely seal leaks. I used 10 wraps on each connection when assembling my meter, and it will hold 45psi (my meter pressure) for over 24 hours.
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Unread postAuthor: Hotwired » Sun Mar 11, 2007 5:30 am

10 wraps?

Thats a hell of a lot... The most I used when assembling my pneumatic and all the fiddly 1/4" threads was two. Thats leakproof at 200+psi for an indefinite length of time.

Mind you I have heard that gas tape is slightly thicker than the standard tape.

Bathtubs are excellent things for testing for leaks as long as the device is a metre or less long. More than that and you're probably better off with a spray bottle of water and washing-up liquid.
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Unread postAuthor: SpudBlaster15 » Sun Mar 11, 2007 12:54 pm

The gas line tape is about 3 times thicker than standard teflon tape, so you dont have to use nearly as much. With 5 wraps of standard tape on each connection, my meter would lose pressure at a rate of about 1psi per second. With 10 wraps, it will hold 100% of its pressure for at least as long as I have tested it, which is 24 hours.
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Unread postAuthor: LGM » Sun Mar 11, 2007 5:36 pm

Wouldn't the liquid pipe sealer be easier to get enough of?
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Unread postAuthor: zeigs spud » Sun Mar 11, 2007 5:48 pm

that looks VERY safe. lol yea i say tape that thing up.
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