Outside Spigot Question. - Page 2 - Plumbing - Contractor Talk

Outside Spigot Question.

 
Thread Tools Search this Thread Display Modes
Old 11-20-2018, 10:45 PM   #21
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Quote:
Originally Posted by Golden view View Post
Neither pipe dope nor teflon tape is about making the seal. It's only an anti-seize so you can tighten the fitting enough to get the proper thread on thread seal.
I'm a bit skeptical on that claim. "True fact"?
MarkJames is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 11-20-2018, 10:50 PM   #22
Radical Basement Dweller
 
Robie's Avatar
 
Trade: Whatever needs to be made or repaired
Join Date: Feb 2005
Posts: 14,441
Rewards Points: 8,412

Re: Outside Spigot Question.


Quote:
Originally Posted by Golden view View Post
Neither pipe dope nor teflon tape is about making the seal. It's only an anti-seize so you can tighten the fitting enough to get the proper thread on thread seal.
Not being smart here...why not just use Vaseline then?
__________________
Immigration is not supposed to change the character of the nation.
Immigration is supposed to change the character of the immigrant.
Robie is online now  
The Following User Says Thank You to Robie For This Useful Post:
dayexco (11-23-2018)
Old 11-20-2018, 10:51 PM   #23
edward trowelhands
 
Golden view's Avatar
 
Trade: Diplomat
Join Date: Feb 2012
Location: PDX
Posts: 4,349
Rewards Points: 5,894

Re: Outside Spigot Question.


Quote:
Originally Posted by MarkJames View Post
I'm a bit skeptical on that claim. "True fact"?
Well I've been wrong many times before. But my understanding is npt is an interference fit. Not to say pipe dope or teflon tape doesn't help fill in minute voids.
__________________
Half of all people are below average.
Golden view is offline  
Sponsored Links
Advertisement
 
Old 11-20-2018, 10:53 PM   #24
Goin' Down in Flames....
 
Seven-Delta-FortyOne's Avatar
 
Trade: Builder/GC
Join Date: Mar 2011
Location: Somewhere Between Heaven And Hell
Posts: 3,569
Rewards Points: 1,490

Re: Outside Spigot Question.


Quote:
Originally Posted by griz View Post
rector seal....

as it is known on site as....rectum seal...


My favorite.

And all this time I thought I invented "rectum seal".

Guess not.
Seven-Delta-FortyOne is offline  
The Following User Says Thank You to Seven-Delta-FortyOne For This Useful Post:
griz (11-20-2018)
Old 11-20-2018, 10:54 PM   #25
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Quote:
Originally Posted by Golden view View Post
Well I've been wrong many times before. But my understanding is npt is an interference fit. Not to say pipe dope or teflon tape doesn't help fill in minute voids.
Apparently you are right. Also, I just learned to never use teflon tape on pvc threads...it can lead to over-tightening and stripping the threads...not necessary.
MarkJames is offline  
The Following User Says Thank You to MarkJames For This Useful Post:
Golden view (11-20-2018)
Old 11-20-2018, 10:56 PM   #26
edward trowelhands
 
Golden view's Avatar
 
Trade: Diplomat
Join Date: Feb 2012
Location: PDX
Posts: 4,349
Rewards Points: 5,894

Re: Outside Spigot Question.


Quote:
Originally Posted by Robie View Post
Not being smart here...why not just use Vaseline then?
No idea, squeezes out too much compared to whatever's in pipe dope? I know that a 1/2" bolt can have something like 12,000 pounds of clamp force, so a 1/2" pipe thread can probably have some pretty strong squeeze between those threads.
__________________
Half of all people are below average.
Golden view is offline  
The Following User Says Thank You to Golden view For This Useful Post:
Robie (11-20-2018)
Old 11-20-2018, 10:57 PM   #27
edward trowelhands
 
Golden view's Avatar
 
Trade: Diplomat
Join Date: Feb 2012
Location: PDX
Posts: 4,349
Rewards Points: 5,894

Re: Outside Spigot Question.


Quote:
Originally Posted by MarkJames View Post
Apparently you are right. Also, I just learned to never use teflon tape on pvc threads...it can lead to over-tightening and stripping the threads...not necessary.
That I definitely did not know.
__________________
Half of all people are below average.
Golden view is offline  
Old 11-20-2018, 11:08 PM   #28
Pro
 
tjbnwi's Avatar
 
Trade: Remodeling
Join Date: Feb 2009
Location: Cedar Tucky, Indiana
Posts: 9,203
Rewards Points: 1,780

Re: Outside Spigot Question.


Quote:
Originally Posted by Golden view View Post
Well I've been wrong many times before. But my understanding is npt is an interference fit. Not to say pipe dope or teflon tape doesn't help fill in minute voids.
It is a tapered (NPT) interference fit. The pipe dope or teflon tape does seal and lubricate the joint.

Think of the threads as a continuous trough, it nothing more than a circular continous line. The dope/tape interrupts the ability for fluid to flow through the trough.

Assemble some air fittings without sealant, even with the tapered fittings made up tight, you'll have a leak. In this case air is the fluid. Better yet, try not using sealant on a vacuum system---good times.

My favorite dope is Leak Lock.

Tom
tjbnwi is online now  
The Following 3 Users Say Thank You to tjbnwi For This Useful Post:
Golden view (11-20-2018), Robie (11-20-2018), tgeb (11-21-2018)
Old 11-20-2018, 11:15 PM   #29
Radical Basement Dweller
 
Robie's Avatar
 
Trade: Whatever needs to be made or repaired
Join Date: Feb 2005
Posts: 14,441
Rewards Points: 8,412

Re: Outside Spigot Question.


Quote:
Think of the threads as a continuous trough, it nothing more than a circular continous line. The dope/tape interrupts the ability for fluid to flow through the trough.
That's what I thought it was for...plus lubrication.
__________________
Immigration is not supposed to change the character of the nation.
Immigration is supposed to change the character of the immigrant.
Robie is online now  
Old 11-20-2018, 11:29 PM   #30
Pro
 
tjbnwi's Avatar
 
Trade: Remodeling
Join Date: Feb 2009
Location: Cedar Tucky, Indiana
Posts: 9,203
Rewards Points: 1,780

Re: Outside Spigot Question.


Quote:
Originally Posted by MarkJames View Post
Apparently you are right. Also, I just learned to never use teflon tape on pvc threads...it can lead to over-tightening and stripping the threads...not necessary.
I use teflon tape on PVC NPT treads all the time. Never had an issue with stripping the threads. Do not use petroleum based dope on PVC.

Don't forget when working on building gas lines---yellow teflon tape.

Tom
tjbnwi is online now  
The Following 3 Users Say Thank You to tjbnwi For This Useful Post:
griz (11-20-2018), hdavis (11-21-2018), Robie (11-20-2018)
Old 11-20-2018, 11:34 PM   #31
Fire up the BBQ
 
griz's Avatar
 
Trade: GC
Join Date: Nov 2009
Location: CA
Posts: 21,457
Rewards Points: 1,612

Re: Outside Spigot Question.


X2 on teflon tape over PVC threads.

Most plumbers I see use it also.
__________________
SOME JOBS JUST AREN'T WORTH DOING:
griz is offline  
Old 11-21-2018, 12:29 AM   #32
Pro
 
hdavis's Avatar
 
Trade: remodeling
Join Date: Feb 2012
Location: CoastalME
Posts: 22,045
Rewards Points: 4,638

Re: Outside Spigot Question.


Quote:
Originally Posted by tjbnwi View Post
I use teflon tape on PVC NPT treads all the time. Never had an issue with stripping the threads. Do not use petroleum based dope on PVC.

Don't forget when working on building gas lines---yellow teflon tape.

Tom

I stripped one. I'm sure I could strip PVC threads without the tape, though.
hdavis is online now  
The Following User Says Thank You to hdavis For This Useful Post:
griz (11-21-2018)
Old 11-21-2018, 12:41 AM   #33
Fire up the BBQ
 
griz's Avatar
 
Trade: GC
Join Date: Nov 2009
Location: CA
Posts: 21,457
Rewards Points: 1,612

Re: Outside Spigot Question.


thread sealant is intended to fill the tiny void at the "v" shape at the bottom of a thread called the "root"....

down to earth ME explained this to me one day.....

sometimes you just gotta go with the flow.....
__________________
SOME JOBS JUST AREN'T WORTH DOING:
griz is offline  
Old 11-21-2018, 05:06 AM   #34
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Quote:
Originally Posted by tjbnwi View Post
I use teflon tape on PVC NPT treads all the time. Never had an issue with stripping the threads. Do not use petroleum based dope on PVC.

Don't forget when working on building gas lines---yellow teflon tape.

Tom
I've used tape on pvc threads without issue, as well (and probably will continue). That comment was a just a "share" from a plumbing mod on another thread, and I guess it makes sense.
MarkJames is offline  
Old 11-21-2018, 05:07 AM   #35
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Quote:
Originally Posted by griz View Post
thread sealant is intended to fill the tiny void at the "v" shape at the bottom of a thread called the "root"....

down to earth ME explained this to me one day.....

sometimes you just gotta go with the flow.....
Nicely worded, there.
MarkJames is offline  
Old 11-21-2018, 05:12 AM   #36
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Do you guys "grease dab" the threads (only the threads, not the ends) on compression fittings? I read somewhere that it was done to reduce the chance of feeling you snugged the nut down enough...when you haven't.
MarkJames is offline  
Old 11-21-2018, 07:06 AM   #37
Pro
 
Big Johnson's Avatar
 
Trade: Contractor Grunt
Join Date: Jun 2017
Location: Michigan
Posts: 3,470
Rewards Points: 2,438

Re: Outside Spigot Question.


I’d just swap out the offending parts with new. I’ve Never had this happen, always been able to get that extra 1/4, 1/2, 3/4 turn if needed. I’ve done quite a bit of black pipe.
Big Johnson is offline  
The Following User Says Thank You to Big Johnson For This Useful Post:
hdavis (11-21-2018)
Old 11-21-2018, 08:40 AM   #38
Pro
 
tjbnwi's Avatar
 
Trade: Remodeling
Join Date: Feb 2009
Location: Cedar Tucky, Indiana
Posts: 9,203
Rewards Points: 1,780

Re: Outside Spigot Question.


Quote:
Originally Posted by MarkJames View Post
I've used tape on pvc threads without issue, as well (and probably will continue). That comment was a just a "share" from a plumbing mod on another thread, and I guess it makes sense.
No, it does not make sense.

All threaded fasteners have a torque to yield ratio, don't exceed it and life is good.

Tom
tjbnwi is online now  
The Following User Says Thank You to tjbnwi For This Useful Post:
rrk (11-21-2018)
Old 11-21-2018, 08:43 AM   #39
Pro
 
tjbnwi's Avatar
 
Trade: Remodeling
Join Date: Feb 2009
Location: Cedar Tucky, Indiana
Posts: 9,203
Rewards Points: 1,780

Re: Outside Spigot Question.


Quote:
Originally Posted by MarkJames View Post
Do you guys "grease dab" the threads (only the threads, not the ends) on compression fittings? I read somewhere that it was done to reduce the chance of feeling you snugged the nut down enough...when you haven't.
I use PTFE on the threads. Again, because you've changed the friction coefficient it is easy to over torque the assembly.

Tom
tjbnwi is online now  
Old 11-21-2018, 09:07 AM   #40
Pro
 
MarkJames's Avatar
 
Trade: Handyman Services
Join Date: Nov 2012
Location: Arlington, VA
Posts: 8,048
Rewards Points: 18,835

Re: Outside Spigot Question.


Quote:
Originally Posted by tjbnwi View Post
No, it does not make sense.

All threaded fasteners have a torque to yield ratio, don't exceed it and life is good.

Tom
I would call that ratio "feel", so it makes sense if the feel of snugness is different for different materials. But maybe it's a plumbing myth afterall.

Advertisement

MarkJames is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
New? Have A Question? Read This First. Seven-Delta-FortyOne General Discussion 55 01-20-2017 11:48 AM
New hot and cold outside spigot... Robie Plumbing 3 05-03-2014 06:17 PM
I have a question about my truck loan VinylHanger Vehicles 23 06-08-2012 11:00 AM
Concrete repair question german Excavation & Site Work 22 05-17-2012 11:38 AM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?