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Old 06-22-2007, 08:23 PM   #16
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Teflon tape or pipe dope


Teflon tape was originally meant to replace wicking.

I use teflon tape on plastic pipe fittings.

Teflon with (Hercules)pipe joint compound on brass to brass.

Teflon with Pro dope on copper to metal fittings.

Grip on gas lines over 3/4".

Leak lock on refrigerent or oil piping.

X-pando on large piping (ie boilers).

Teflon paste or Megaloc on small gas piping

If you read the Rector seal can you will see it is supposed to be left to set for a while before pressure is applied.

Often the specs on a job specify what dope is to be used on what piping.

I am a United Association pipefitter for over 20 years and have seen many trends come and go but there are some old hold outs.

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Old 06-23-2007, 05:47 PM   #17
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Teflon tape or pipe dope


To much pipe dope on a gas line will get inside the pipe and spread out like a spider web.
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Old 06-25-2007, 01:36 PM   #18
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Teflon tape or pipe dope


Do you guys use teflon tape on pvc fittings no matter what, or do you wait until it leaks and then use it?

Is Teflon tape on pvc joints a requirement?
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Old 06-25-2007, 08:11 PM   #19
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Teflon tape or pipe dope


Any pipe joint needs some type of thread sealant. So, yes
always use it on plastic threads.
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Old 06-25-2007, 08:13 PM   #20
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Teflon tape or pipe dope


Use teflon tape always on plactic male threads when dealing with water.
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Old 06-26-2007, 04:14 PM   #21
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Teflon tape or pipe dope


Teflon tape increases the OD of the male fitting, too much will crack a plastic fitting (fmoe) . I prefer dope with teflon. I recently read (from a reliable source) to only use dope on 3/4 of the male thread, the rest will fill in and not get to the inside of the pipe. I'm a mechanic, not a plumber, so sue me if I'm wrong.
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Old 06-26-2007, 09:00 PM   #22
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Teflon tape or pipe dope


Pipe dope in the male thread water only, will make it too slick, too slick will cause you to overtighten, take it from a pro in the field.
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Old 06-26-2007, 09:55 PM   #23
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Teflon tape or pipe dope


What do you use on male threads when it isn't water? And what else do you use plastic pipe for?
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Old 06-26-2007, 10:29 PM   #24
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Teflon tape or pipe dope


I'll use pipe dope on dwv fittings, male adaptors, Clean out plugs, sometimes I'll use a them both, dope over the top of tape. When combined tape and dope will use on both dwv and plastis water pipe, but never dope alone on water pipe male threads.
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Old 06-27-2007, 12:50 PM   #25
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Teflon tape or pipe dope


Quote:
Originally Posted by Ron The Plumber View Post
I'll use pipe dope on dwv fittings, male adaptors, Clean out plugs, sometimes I'll use a them both, dope over the top of tape. When combined tape and dope will use on both dwv and plastis water pipe, but never dope alone on water pipe male threads.
Never heard of using both. You sound like a hella good plumber.
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Old 06-28-2007, 12:21 PM   #26
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Teflon tape or pipe dope


Interesting info guys, thanks. my question ... i am putting a manifold together for my air compressor, combination for brass and gal steel. Will pipe dope and teflon work w/this application?

thx
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Old 06-28-2007, 12:24 PM   #27
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Teflon tape or pipe dope


For air compressor use tape only, don't use pipe dope.
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Old 07-05-2007, 12:58 AM   #28
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Teflon tape or pipe dope


Just wanted to say 'thanks' for the idea of using teflon tape and also pipe dope on a water connection. I just could get a consistent seal with just tape, and the pipe dope seems to have made the difference (well, so far!).
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Old 07-20-2007, 10:22 AM   #29
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Teflon tape or pipe dope


I didn't use tape, dope only on most of the threaded connections in my house when I built. I ended up redoing them with teflon tape as most of them leaked. Lesson learned.

Teflon dope on LP pipe. I used teflon tape on my PVC cleanout caps.
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Old 07-20-2007, 10:31 AM   #30
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Teflon tape or pipe dope


Quote:
Originally Posted by comp1911 View Post
I didn't use tape, dope only on most of the threaded connections in my house when I built. I ended up redoing them with teflon tape as most of them leaked. Lesson learned.

Teflon dope on LP pipe. I used teflon tape on my PVC cleanout caps.
Agree... Another example of company trying new invention on convention items for making bucks...

go with what is working and stay with tradition is a good idea most of the times.

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