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  #11  
Old 09-16-2021, 12:47 AM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 389
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Quote:
Originally Posted by fr0gpil0t View Post
I didn't think you were meant to put sealant on the threads of flare fittings ? But I'm a new builder.
Quote:
Originally Posted by rvbuilder2002 View Post
Heís correct. Sealant should only be applied to the NPT portion of fittings and nothing on the side that gets a B nut for aluminum line or hose end.
I don't see where the OP says he used any sealant
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  #12  
Old 09-16-2021, 05:24 AM
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PaulvS PaulvS is offline
 
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Quote:
Originally Posted by Jake14 View Post
I don't see where the OP says he used any sealant
I (also) assumed that the black substance that is visible on the threads in the photo is sealant, it sure looks like it, but I'm not certain exactly what it is. I've learned a bit from these posts, so it has been helpful.
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  #13  
Old 09-16-2021, 08:04 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Jake14 View Post
I don't see where the OP says he used any sealant
He didnít, but if you zoom in on the photo you an clearly see what looks to be Permatex #2 under the B nuts.
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  #14  
Old 09-16-2021, 09:17 AM
TS Flightlines TS Flightlines is offline
 
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I'm alittle late to the party, but we've used the Military/Commercial aviation guidelines. Seemed logical to me that if its good enough for military, why question it.

Tom
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  #15  
Old 09-16-2021, 09:20 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by TS Flightlines View Post
why question it.
I don't see that anyone has Tom, unless you happen to know that the OP has lines made by you......
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  #16  
Old 09-16-2021, 10:12 AM
painless painless is offline
 
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Agree on the flair size. Another fix is to use the real thin aluminum flaired inserts that are available for the various AN sizes. They take up any discrepancies in seating the fitting to the tube flair.
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  #17  
Old 09-16-2021, 10:19 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by painless View Post
Agree on the flair size. Another fix is to use the real thin aluminum flaired inserts that are available for the various AN sizes. They take up any discrepancies in seating the fitting to the tube flair.
I agree that the Dell seals are a good option when a good seal can't be made with the standard connection.
Generally, the tubing we use on RV's is soft enough though, that if the flaring is made properly and the connection is properly torqued, a leak is rather rare.

Where the Dell seals are of a lot more value is in hard connections. Such as hose end connections. Particularly when it is a hose with a steel sealing face interfacing to a steel AN fitting.
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  #18  
Old 09-16-2021, 10:27 AM
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walldan walldan is offline
 
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Quote:
Originally Posted by TS Flightlines View Post
I'm alittle late to the party, but we've used the Military/Commercial aviation guidelines. Seemed logical to me that if its good enough for military, why question it.

Tom
What book is that? Can you give me the title? I would like to get a copy.
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  #19  
Old 09-16-2021, 10:51 AM
JDeanda JDeanda is offline
 
Join Date: Apr 2013
Location: Ventura, CA
Posts: 273
Default Small Thing

Iíve flared a few tubes, aluminum, stainless and even copper. Sometimes, if a new flare leaks, it just needs to be loosened and retightened a time or two.
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  #20  
Old 09-16-2021, 11:17 AM
Ron B. Ron B. is offline
 
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Location: Yarmouth, Nova Scotia
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I tip I was given on here as to flaring alum tube is to apply a drop of oil on the tip of the mandrel before inserting it into the tubing. Made a huge difference for me in quality flares.
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