The point with JIC/AN/37 degree single flares with tube nuts and tube
sleeves is that the flare does not do the sealing. The tube sleeve applies
stretch/push aginst the flare, sealing it to the mail fitting. Reusable as
the flare does not disotrt. I have made hindreds of AN3, 4 and 6 JIC flares
with the Aircraft Spruce single flare 37 degree flaring tool in both steel
and aluminum tubing. To my knowledge, none have ever leaked or cracked.
Chuck
On 1/10/07, John Herrera <jrherrera90@hotmail.com> wrote:
>
> >hmmmm... exactly why I don't use single flare, they crack. I would
> suggest
> >that the steel bundy tubing is perhaps more malleable than that used in
> >aircraft? FWIW I never have cracking problems with automotive type bundy
> >tubing.
> >Just speculation on my part though. This is an interesting topic
> >nonetheless.
> >Glen
>
> That's probably it. That's why I put the "Dunno" disclaimer in. The double
> flares would crack right around the outside of the overlapping bend for
> the
> "double" part of the flare. Maybe something was wrong with our tool.
>
> Single flares get radial cracks when students overtighten the flaring
> tool;
> it squishes the material. Or from overtightening the B-nut in a misguided
> attempt to fix a leak.
>
> John
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--
Chuck Arnold
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