Recent Topics
Inherently Political
by bvance554
03/23/17 12:31 AM
Oil and filters as gifts.
by Black_Thunder
03/23/17 12:13 AM
I mixed Amsoil 10w40 DB and Motul 300v 4t 10w40
by trod30
03/22/17 11:49 PM
Dogs in WalMart
by AZjeff
03/22/17 10:44 PM
They done gone and changed Delo!
by MinamiKotaro
03/22/17 09:39 PM
Eibach rear sway bar 2015 Honda Civic
by Marco620
03/22/17 09:27 PM
What to expect when cutting filter open?
by Spetz
03/22/17 08:00 PM
2006 Mercury Milan
by Throt
03/22/17 07:46 PM
2015 Nissan Froniter High copper
by millerbl00
03/22/17 07:19 PM
What's a fair alignment price- GM W-body w/ camber
by TmanP
03/22/17 07:09 PM
Microgard and Hyundai
by Fordai
03/22/17 06:48 PM
Oh that Yellow Pollen !
by mctmatt
03/22/17 06:43 PM
New(?) Mobil 1 oil filters?
by kohnen
03/22/17 06:18 PM
2015 Subaru Forester, which oil to use?
by MoneyJohn
03/22/17 06:06 PM
Mazda/Castrol 0W-20 - 2017 Mazda3 2.5L
by WellLubed
03/22/17 06:02 PM
Body shop finish
by Bear
03/22/17 05:51 PM
Graphic oil filter abuse
by AntsinmyEyes
03/22/17 05:26 PM
Cooper Cobra Radial Gt's
by 007
03/22/17 05:21 PM
Mercedes ML 350 Filter
by stang5
03/22/17 05:14 PM
Mighty Guard M500 3,500 miles CUT OPEN
by car51
03/22/17 03:49 PM
Newest Members
Felman, jmblitch, 84V, 604Maxximus, JOHNRATCLIFFE
60938 Registered Users
Who's Online
13 registered (FloatingBrick, Harleydav91, Kuato, Black_Thunder, Falcon_LS, E365, 1 invisible), 1081 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60938 Members
66 Forums
262667 Topics
4336380 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#3308497 - 03/11/14 04:50 PM Thread Sealers, Gap Fill and Large Threads.
George7941 Offline


Registered: 05/10/05
Posts: 1896
Loc: Toronto, Canada
On my roll of yellow PTFE tape for gas lines, it says to use it for lines no larger than 1 1/2in.

I assume larger threads have larger gaps that the tape cannot fill. So, the question that arises is - what do you use on large dia threads?
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#3308525 - 03/11/14 05:11 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
1foxracing Offline


Registered: 01/20/14
Posts: 162
Loc: OH

Top
#3308631 - 03/11/14 07:07 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
yonyon Offline


Registered: 03/06/12
Posts: 3492
Loc: NJ, USA
I like this stuff:
The same brand also has a version specifically for use with E85 and one for worn threads.

Top
#3308637 - 03/11/14 07:13 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
Stelth Offline


Registered: 02/24/11
Posts: 1904
Loc: California
Originally Posted By: George7941
On my roll of yellow PTFE tape for gas lines, it says to use it for lines no larger than 1 1/2in.

I assume larger threads have larger gaps that the tape cannot fill. So, the question that arises is - what do you use on large dia threads?


I don't know why your roll of tape says that it's only good up to 1-1/2" pipe. It may be that the manufacturer offers a wider tape, and wants you to use that. Teflon tape is commonly available in 1/2", 3/4", and 1" widths. Having said that, as pipe gets bigger, it is harder to seal. A few years ago, I did a gas piping job that involved several hundred feet of galvanized pipe from 4" down to 1/2" diameter, all threaded. We used mostly X-Pando, which is an industrial thread sealant that expands as it dries. It worked well. On at least a couple of 4" threads, we used a combination of Key-Tite and teflon tape, which also worked well. We were required to use a 24-hour recording gauge to test this pipe, and we passed.

Another factor to consider is the contents of the pipe. There are different sealants for different liquids and gases. If it's water or compressed air, pretty much any pipe dope will be OK, although on the big sizes some are better than others.
_________________________
Experts are often wrong, but rarely in doubt.

Top
#3308675 - 03/11/14 07:48 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: 1foxracing]
George7941 Offline


Registered: 05/10/05
Posts: 1896
Loc: Toronto, Canada
Originally Posted By: 1foxracing


These paste sealants also have pipe size limits. I am looking at a Loctite industrial products catalogue and these are the pipe size limits
Loctite 545 2"
565 2"
567 3" (this is the thread sealer I use)
561 sealant stick 3"

I was just curious as to what is used on large pipes, I am thinking 6 to 8" dia.


Edited by George7941 (03/11/14 07:50 PM)
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#3308700 - 03/11/14 08:12 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
George7941 Offline


Registered: 05/10/05
Posts: 1896
Loc: Toronto, Canada
The X-pando sealant mentioned looks like it is a good candidate for large dia threads since it expands. The X-pando website however does not list gap-fill specs. For Locite, gap-fill varies from 10 thou for 545 to 20 thou for 567.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#3309409 - 03/12/14 01:11 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
Stelth Offline


Registered: 02/24/11
Posts: 1904
Loc: California
George, are you actually trying to seal some big pipes, or is this just idle curiosity?
_________________________
Experts are often wrong, but rarely in doubt.

Top
#3309486 - 03/12/14 02:36 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
Trav Offline


Registered: 11/20/06
Posts: 15400
Loc: MA, Mittelfranken.de
Originally Posted By: George7941
On my roll of yellow PTFE tape for gas lines, it says to use it for lines no larger than 1 1/2in.

I assume larger threads have larger gaps that the tape cannot fill. So, the question that arises is - what do you use on large dia threads?


Oakum can be used for large diameter pipe. AKA horsehair and hemp rope it is still common in Germany and other Euro countries.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

Top
#3309500 - 03/12/14 02:59 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
Bob_E Offline


Registered: 02/07/14
Posts: 55
Loc: Long Island NY
_________________________
'12 Mazda6 2.5L PP 0W-20 & MC Fl-910s
'16 Hyundai Sante Fe 3.3L unknown

Top
#3309852 - 03/12/14 08:14 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: Stelth]
George7941 Offline


Registered: 05/10/05
Posts: 1896
Loc: Toronto, Canada
Originally Posted By: Stelth
George, are you actually trying to seal some big pipes, or is this just idle curiosity?


Just idle curiosity.

I have taken apart house heating pipes that were assembled with some kind of fibrous material, probably oakum.

I have never worked with pipe threads larger than 1 1/2 inch.
_________________________
2006 GMC Sierra 4.3l, NV3500,G80 , Formula Shell Synthetic 5W30,Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.

Top
#3314808 - 03/17/14 11:19 AM Re: Thread Sealers, Gap Fill and Large Threads. [Re: George7941]
camelCase Offline


Registered: 07/11/13
Posts: 170
Loc: Southeastern, USA

Top
#3314999 - 03/17/14 02:11 PM Re: Thread Sealers, Gap Fill and Large Threads. [Re: camelCase]
Trav Offline


Registered: 11/20/06
Posts: 15400
Loc: MA, Mittelfranken.de
Thanks for the link, it is interesting stuff.
_________________________
ASE L1, Master. Deutsch Meisterbrief.

Top