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Old 12-26-2013, 12:20 AM   #1
archthered
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My amazing and wonderful wife got me a 10 gal 1.2 Megapot with ball valve and thermometer for Christmas. According to the directions I need to put Teflon tape on the threads. Is there any reason I can't just use pipe dope I have from the bathroom? Thanks.

 
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Old 12-26-2013, 12:37 AM   #2
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Don't know but Teflon tape is Inexpensive and recommended by manufacturer so would probably follow their instructions

Very nice gift and vey nice wife
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Old 12-26-2013, 01:02 AM   #3
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Quote:
Originally Posted by tinhorn
don't know but teflon tape is inexpensive and recommended by manufacturer so would probably follow their instructions very nice gift and vey nice wife
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Old 12-26-2013, 01:06 AM   #4
northcal
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Isn't pipe dope for non potable water?

I'd use either teflon tape or teflon paste.

good luck,

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Old 12-26-2013, 01:06 AM   #5
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Quote:
Originally Posted by archthered View Post
My amazing and wonderful wife got me a 10 gal 1.2 Megapot with ball valve and thermometer for Christmas. According to the directions I need to put Teflon tape on the threads. Is there any reason I can't just use pipe dope I have from the bathroom? Thanks.
"What whetting agent is used in the dope? Do you want it in your beer?

 
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Old 12-26-2013, 01:16 AM   #6
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Teflon is non-leaching. At least, it leaches so low that it's almost negligible. If you were to use dope, I would make sure it's food grade; and AFAIK most "food grade" dope is for plastic, not SS; SS pipes make a mechanical seal.

To be honest, the pipe threads we use in brewing are subject to such low pressures and temperature that the mechanical seal you create by tightening them is sufficient. As long as you tighten them enough, and never loosen them, it's fine. If it's going to be taken apart, you will need teflon to fill the gaps.
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Old 12-26-2013, 02:01 AM   #7
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most pipe dope has an oil base, leave some sit in a warm place for a while in the can and look at all the stuff that comes out of the mix. dont think id want that in my beer.

 
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Old 12-26-2013, 02:10 AM   #8
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Quote:
Originally Posted by Cathedral
Teflon is non-leaching. At least, it leaches so low that it's almost negligible. If you were to use dope, I would make sure it's food grade; and AFAIK most "food grade" dope is for plastic, not SS; SS pipes make a mechanical seal.

To be honest, the pipe threads we use in brewing are subject to such low pressures and temperature that the mechanical seal you create by tightening them is sufficient. As long as you tighten them enough, and never loosen them, it's fine. If it's going to be taken apart, you will need teflon to fill the gaps.
One of the big reasons for Teflon tape is to keep your threads from binding. Stick with Teflon tape, or nickel tape for connections outside your kettle. It has a higher temp resistance and is thicker.

If you don't use the tape and you get a leak and the threads bind, or if you ever want to switch things out, you'll have to replace the fitting (and potentially cut it out).

Don't go with pipe dope - Teflon tape is the way to go.
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Old 12-26-2013, 02:40 AM   #9
archthered
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Ok so it sounds like I'm going to the hardware store tomorrow. I was just trying to not have to make a shopping trip just for thread tape but it sounds like I need to. Won't be a waste of a trip, I can get the distilled water to check the calibration on my thermometer.

Thanks!

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Old 12-26-2013, 03:03 AM   #10
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Quote:
Originally Posted by brewguyver View Post
One of the big reasons for Teflon tape is to keep your threads from binding. Stick with Teflon tape, or nickel tape for connections outside your kettle. It has a higher temp resistance and is thicker.

If you don't use the tape and you get a leak and the threads bind, or if you ever want to switch things out, you'll have to replace the fitting (and potentially cut it out).

Don't go with pipe dope - Teflon tape is the way to go.
Im sorry, I don't mean to sound rude--even though I will--but that is absolutely not true at all. I'm a machinist, knowing threads is part of my job, not just a hobby; I don't say that to sound condescending but to imply that I literally have studied threads and what their shape is designed for. There are two types of pipe thread you will encounter in the general public DYI field: NPT, and NPTF. 95% of what you will buy and use is NPT. I could get into the specifics of the differences of each, but I'd rather it just be googled.

Tape is ~necessary~ for NPT threads if they are going to be subject to pressure without making a mechanical seal, or are going to be torqued to a seal, then loosened. It has nothing to do with lube, but actual seal. NPT threads aren't designed to seal mechanically, so thus they need tape to seal. They CAN be sealed mechanically, without tape, but then CANNOT be taken apart without compromising the seal.

Even if you deform the threads to a mechanical seal, and then loosen it, you can still use it with tape to make a seal. There is no way you should ever have to replace a fitting unless you a) applied WAY to much torque and deformed the threads, or b) crossthreaded the threads and destroyed them.

99% of threads are NOT one time use. If they get screwed up so that they can't be used again, chances are it's operator error, not because you didn't use "lube."
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