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Old 09-10-2009, 02:03 PM   #1
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Pipe need to be dry when wrapping teflon tape?


Hey guys,

First post, so take it easy on me

Just installed a new 40 gallon water heater last night and there are small leaks right at the dielectric nipples for both hot and cold. Its a small leak, maybe 3 drips every minute, but does accumulate to a small puddle over time. The nipple is connected directly to the pipe with a threaded union bolt.

When wrapping the teflon tape on the nipple, I couldn't cut off the water completely due to a faulty shutoff valve, so water kept coming out and spilling over as I was wrapping the threads. Could wrapping the teflon tape on a wet pipe vs a dry pipe compromise its sealing ability?

I'm going shut off all whole house water supply tonight and re-wrapping the connection - any suggestions would be appreciated to assure it doesn't leak after this time!

Thanks!

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Old 09-10-2009, 02:26 PM   #2
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Pipe need to be dry when wrapping teflon tape?


NO THEY DON'T HAVE TO BE DRY BUT JUST WORKS BETTER THAT WAY !

WHAT YOU NEED TO DO IS GET SOME PLUMBERS TEFLON PIPE DOPE AND PUT ON OVER THE TAPE THE IT WILL SEAL !

REMEMBER PIPE THREADS ARE TAPERED THAT IS WHAT SEALS THE FITTING !

THE TAPE AND DOPE IS JUST TO LUBERCATE THE THREADS !

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Old 09-10-2009, 03:22 PM   #3
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Pipe need to be dry when wrapping teflon tape?


Also remember that those 3/4" nipples require a heck of a lot of tape to seal the threads. 3 or 4 wraps won't do it. I'd say several wraps of tape are in order.
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Old 09-27-2009, 08:43 PM   #4
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Pipe need to be dry when wrapping teflon tape?


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Originally Posted by thekctermite View Post
Also remember that those 3/4" nipples require a heck of a lot of tape to seal the threads. 3 or 4 wraps won't do it. I'd say several wraps of tape are in order.
That's nonsense. If its a machined nipple 4 wraps is more than enough for a properly tightened fitting. If it was made at Home Depot or something they probably messed it up.
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Old 09-27-2009, 08:48 PM   #5
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Pipe need to be dry when wrapping teflon tape?


Your experiences and mine obviously vary. Welcome to the forum, no need to be unfriendly here.
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Old 09-27-2009, 10:29 PM   #6
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Pipe need to be dry when wrapping teflon tape?


I always, always, always use 5-7 wraps of teflon tape then coat with pipe dope when it comes to sealing threaded waterline connections. Its just something that years and years of experience has taught me. Something the OP might have done is either not used enough tape OR wrapped the tape in the wrong direction....or it could be as simple as the adapter may not have been tightened enough.

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