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Hi,
Is it true that there is a high temperature thread sealing tape? I am using propane fuel in my forge. It's a venturi burner forge.
I have disassembled my forge for maintenance, and after reassembly I had a gas leak. I heard that could be I need a high temperature tape. I've looked all over the internet for such a thing, but can't find anything for situations rated higher than 500 F. Does it exist?
I purchased new mig tips(they are the jets) and I think I'll just wirebrush all the the threads and start over with regular gas pipe threading tape.
Thanks.
Is it true that there is a high temperature thread sealing tape? I am using propane fuel in my forge. It's a venturi burner forge.
I have disassembled my forge for maintenance, and after reassembly I had a gas leak. I heard that could be I need a high temperature tape. I've looked all over the internet for such a thing, but can't find anything for situations rated higher than 500 F. Does it exist?
I purchased new mig tips(they are the jets) and I think I'll just wirebrush all the the threads and start over with regular gas pipe threading tape.
Thanks.
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Fairfax
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Don't use Teflon tape for either of those applications unless you want to kill yourself... well make yourself sick. Teflon decomposes at high temperatures into poisonous gases.
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I would be very surprised if you were leaking at the jets. The softer copper should tighten up well against steel. There is gas pipe tape that is different than regular teflon or you could use pipe dope.
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Ok thanks for the info on teflon.
what is pipe dope?
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Pipe dope is what plumbers used to use to seal the threads on iron pipe before Teflon tape was introduced/became popular. It tended to be a slimy, oily grey ooze that was brushed onto the threads of the pipe, and it was a nasty mess to clean up if you got it on anything important. Gran'pa used to bellow at me for playing with his. It's still available, but not as easy to find as the Teflon tape.
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It is the horrible, slimy, ooziness of pipe sealant (proper name) that make it so effective. It is still the sealant of choice for big stuff.
My venturii enter the forge from the top, so I simply assume that after the forge is shut down that they will act as chimneys and get pretty darn hot. So there is no sealant up there. (I have taken apart some official gas appliances and never seen any sealant around the orifices. -
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Pipe sealant, aka brush on thread sealer, aka Pipe Dope, is generally still available in the plumbing section of the big box stores, and most likely at your small local hardware as well. My favorite brand is called Gas-Oil-a, but its become hard to find lately. Otherwise, just use the basic liquid stuff (which seems to be sliiiightly less thick, but still very effective). It will most likely say its specifically for Gas piping or perhaps "WOG" on it somewhere, standing for "Water, Oil, Gas".
Copper and brass, as fciron pointed out, are self-sealing types of threads, but I still dope them anywhere heat is not an issue.
Also, make sure you test everything with leak detector or soapy water… put a little soft-soap into an empty spray bottle, add water and shake it up. Spray it all over each connection and watch for bubbles. -
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Oh… and DO NOT use Teflon tape on any gas connections unless it is specially marked for use for such. It usually comes in a yellow plastic ring, instead of blue.
But please double check me on that and MAKE SURE it says it's for use with gas piping. -
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Goto the local plumbers supply, where the real plumbers go to get stuff, they have the
high temp pipe dope that is used when hooking up gas fireplaces and gas log starters for fire places.
I use it on my propane torches, and it was not that much more expensive, i just had to ask the
guy behind the counter to point out the right one.
Cal-
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