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Old 02-04-2016, 04:00 PM   #31
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Technically, neither the tape not dope is suppose to be sealing the pipe/threads. They are tapered threads, they seal to themselves. The tape and pipe dope are for lubricating the threads so you can tighten them.

1/2", pipe dope or tape is fine. 1/2" is easy to tighten.
High pressure gun grease or Silicone aresol may have better lubricating qualities than Rectorseal so I believe I'll try that. The aresol spray can sure would be easy to use.
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Old 02-04-2016, 04:11 PM   #32
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Try what you want.

I prefer to use UL approved for gas piping, thread lubricants.
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Old 02-04-2016, 06:01 PM   #33
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rectorseal and others like it are approved....never seen grease or silicone used on piping in 40 years...sorry....
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Old 02-04-2016, 06:22 PM   #34
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Always humorous when an OP asks advice, receives good expert advice and then disregards it all and is dead set on blowing up his house...
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Old 02-04-2016, 06:29 PM   #35
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Always humorous when an OP asks advice, receives good expert advice and then disregards it all and is dead set on blowing up his house...
How so?
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Old 02-04-2016, 06:48 PM   #36
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Technically, neither the tape not dope is suppose to be sealing the pipe/threads. They are tapered threads, they seal to themselves. The tape and pipe dope are for lubricating the threads so you can tighten them.

True. I first learned this from a 3M industrial sales rep pitching their line of thread sealants and lockers.

Everyone just assumes its the tape and or dope doing the sealing.
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Old 02-04-2016, 07:34 PM   #37
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Quote:
Originally Posted by beenthere View Post
Technically, neither the tape not dope is suppose to be sealing the pipe/threads. They are tapered threads, they seal to themselves. The tape and pipe dope are for lubricating the threads so you can tighten them.

1/2", pipe dope or tape is fine. 1/2" is easy to tighten.
while technically correct, as soon as the dies get slightly worn or are not adjusted to exact tolerances and or the quality of pipe becomes less in todays market, they wont seal, and to spend $$ on new dies all the time and make sure the pipe is top quality..the sealants do seal...they do both lubricate the threads and seal against leaks..
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Old 02-04-2016, 07:39 PM   #38
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I could see threads sealing themselves if they were as precision as gauge blocks but that will never happen, so at that point the connection becomes more of a labyrinth seal and something is needed to fill the voids to completely seal.
Those voids look like craters on the moon if viewed through a microscope and that's where all the different thread sealant formulations come into play.
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Old 02-04-2016, 08:58 PM   #39
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Quote:
Originally Posted by Yodaman
Everyone just assumes its the tape and or dope doing the sealing.
It is if a thread protector is used as a coupling.
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Old 02-04-2016, 11:11 PM   #40
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Always humorous when an OP asks advice, receives good expert advice and then disregards it all and is dead set on blowing up his house...
SORRY gizzygone! I did not bother to look back at names and made an entirely wrong assumption that you had written a specific post I took issue with, when you definitely did not.

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Old 02-05-2016, 02:19 AM   #41
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SORRY gizzygone! I did not bother to look back at names and made an entirely wrong assumption that you had written a specific post I took issue with, when you definitely did not.
Haha. It's okay. I was just trying to figure out what exactly I was missing that would lead to a crater in the ground (just trying to not piss the wife off you know?)
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Old 02-05-2016, 03:26 AM   #42
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Quote:
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I could see threads sealing themselves if they were as precision as gauge blocks but that will never happen, so at that point the connection becomes more of a labyrinth seal and something is needed to fill the voids to completely seal.
Those voids look like craters on the moon if viewed through a microscope and that's where all the different thread sealant formulations come into play.
60, 70 plus year old cast iron rads have their ells and valves turned in them with pipe dope(not a thread sealant)and still don't leak today. Cast iron threads are smooth. But the metal to metal contact keeps them sealed.
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Old 02-05-2016, 07:28 AM   #43
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Haha. It's okay. I was just trying to figure out what exactly I was missing that would lead to a crater in the ground (just trying to not piss the wife off you know?)
hmm, theres a cure for that..just have wife check for gas leaks with a bic lighter..while you wait down the block....LOL
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Old 02-05-2016, 07:13 PM   #44
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Originally Posted by SeniorSitizen View Post
I could see threads sealing themselves if they were as precision as gauge blocks but that will never happen, so at that point the connection becomes more of a labyrinth seal and something is needed to fill the voids to completely seal.
Those voids look like craters on the moon if viewed through a microscope and that's where all the different thread sealant formulations come into play.
I've only seen them used in industrial applications, but NPTF are essentially high tolerance NPT fittings that will seal with out the use of PFTE tape or thread sealant. Both male and female must be NPTF for this to work, otherwise they can be used interchangeably with NPT fitting with normal thread sealants.


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I use both---perhaps over kill--but I got into the habit when runnig 4" threaded that was heated and pushing melted chocolate under high pressure---(don't ask--I've done some odd work in my life)
I definitely plumbing in a 4" chocolate line into my next kitchen remodel! I've already informed my wife.

I once helped run a 3" chilled kerosene loop. Am I at least close to odd?
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Old 02-05-2016, 08:35 PM   #45
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I love chocolate----the people in the factory thought I would loose my taste for it---nope----

We were installing tanks and pumps and chip depositing machines--the small tanks would fill a semi-tanker truck and the big ones were 1 1/2 trucks worth---

Fun job---we would remove the steel siding from the factory to slip them inside--
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