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  #1  
Old 10-16-2018, 01:53 PM
rcarsey rcarsey is offline
 
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Default AN fittings & sealant

Section 5.27 tells us about using Permatex #2, Tite-seal, or Loctite 565 on pipe thread fittings...

Quote:
"Because we cannot always fully tighten tapered thread fittings, and because even after fully tightening the fitting a small spiral leak path remains along the full length of threads, a thread sealant must be used during assembly"
I've been applying Permatex #2 to AN threads.. does it also get applied to the nipple/flange side of the fitting as well? (the side where a flanged tube mates to the fitting with an AN nut).

I don't think so? I don't see how it would prevent a leak on this side of the fitting.

Last edited by rcarsey : 10-16-2018 at 06:11 PM.
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  #2  
Old 10-16-2018, 02:01 PM
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G-force G-force is offline
 
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No. Only on tapered, NPT threads. The AN side with the 37 degree angle seals dry on the 37 degree face. If the faces are slightly mared and cannot be easly replaced, there are ̶t̶e̶f̶l̶o̶n̶ Aluminum tapered washers you can install in between.

EDIT: The washer are Aluminum
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Last edited by G-force : 10-16-2018 at 11:17 PM.
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Old 10-16-2018, 02:36 PM
bobnoffs bobnoffs is offline
 
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fwiw i recently cleaned year old permatex #2 gasket sealer [non hardening] off of the tube using gasoline as the solvent.
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Old 10-16-2018, 05:02 PM
Aluminum Aluminum is offline
 
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Quote:
Originally Posted by bobnoffs View Post
fwiw i recently cleaned year old permatex #2 gasket sealer [non hardening] off of the tube using gasoline as the solvent.
I used permatex #2 as recommended by a certain Australian engine company to seal the NPT threads on oil cooler fittings. All four fittings leaked after a few months. A few years later I got tired of wiping off the mess and redid the whole job with Loctite 545. No leaks.
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Old 10-16-2018, 05:25 PM
Azjulian Azjulian is offline
 
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I suspect that those leaks were related to contaminants being present on the threads, I thoroughly degreased mine and have had zero problems.
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  #6  
Old 10-16-2018, 05:38 PM
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FWIW; I have been using Permatex #2 on NPT fittings for too many years to count.
I've used it on cars, trucks, boats, and aircraft and have NEVER had a leak caused by this sealant.
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  #7  
Old 10-16-2018, 05:39 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by G-force View Post
No. Only on tapered, NPT threads. The AN side with the 37 degree angle seals dry on the 37 degree face. If the faces are slightly mared and cannot be easly replaced, there are teflon tapered washers you can install inbetween.
No, not tapered teflon washers.

They are formed soft aluminum seals and should be able to repair marred surfaces on the 37 degree angle faces.

https://www.aircraftspruce.com/catal...37fittings.php

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  #8  
Old 10-16-2018, 06:17 PM
TS Flightlines TS Flightlines is offline
 
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Putting a sealant on the AN threads 'can' allow the nut to tighten before the 2 seats make sufficient contact. Leakage will occur in most cases.

Tom
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  #9  
Old 10-16-2018, 11:15 PM
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G-force G-force is offline
 
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Quote:
Originally Posted by az_gila View Post
No, not tapered teflon washers.

They are formed soft aluminum seals and should be able to repair marred surfaces on the 37 degree angle faces.

https://www.aircraftspruce.com/catal...37fittings.php

I stand corrected, its been decades since I actually had on in hand. It appears Del makes them in Aluminum, copper, nickle and stainless.
http://www.delaerospace.com/files/23000507.pdf
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Old 10-17-2018, 12:09 AM
Aluminum Aluminum is offline
 
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Quote:
Originally Posted by Mel View Post
FWIW; I have been using Permatex #2 on NPT fittings for too many years to count.
I've used it on cars, trucks, boats, and aircraft and have NEVER had a leak caused by this sealant.
Contamination or under-torquing was unlikely, as all four threads of two different sizes and fitting geometries failed in the same way. I figured it might have been a bad tube of Permatex, but see little point debugging the failure in an aircraft application when methacrylate sealants are far superior. bobnoffs comment jogged that memory so I thought I'd add my anecdote in case others encountered similar failures.
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