Today's Message Index:
----------------------
1. 06:30 AM - Re: leaking nylo -seal fittings (Carl Froehlich)
2. 09:09 AM - Re: leaking nylo -seal fittings (Thomas Sargent)
3. 09:23 AM - Re: leaking nylo -seal fittings (don van santen)
4. 09:23 AM - Re: leaking nylo -seal fittings (vanremog@aol.com)
5. 09:23 AM - Re: leaking nylo -seal fittings (don van santen)
6. 09:42 AM - Re: leaking nylo -seal fittings (Dave Saylor)
Message 1
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| Subject: | leaking nylo -seal fittings |
The plastic inserts are required. I used these on two airplanes and
pitot static come out tight as a drum. Never found a need for tape on
the hose fitting side as the threads are not the seal =93 the
nylon ferrule that seats in the fitting is the seal. I do add some
Teflon pipe thread sealant (auto part store stuff) on the pipe thread
fittings that screw into instruments and such.
After you break off a nut or two by over tightening you quickly get a
sense of =9Ctight enough=9D.
Carl
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Dave Saylor
Sent: Sunday, June 22, 2014 11:58 PM
Subject: Re: RV-List: leaking nylo -seal fittings
Teflon tape on pipe threads (ie, into the back of instruments) will help
a lot. It won't help at all on the B-nuts. The threads that accept a
B-nut are different from the NPTs that go into instruments.
If you didn't use the little plastic inserts that go in the end of the
tubes, that makes a huge difference.
I like using a crow's foot to tighten nylon B-nuts. It's handy in
cramped quarters and keeps me from over doing the torque.
--Dave
On Sun, Jun 22, 2014 at 8:29 PM, Thomas Sargent <sarg314@gmail.com>
wrote:
I have a pretty big leak in my static air system. I used nylo-seal
fittings throughout. I never know how tight to make them. How do you
know when to stop tightening? I just use my fingers. The leaking fitting
is a T screwed into my altimeter. I've tested all the components and
when I added the T, I added a leak.
Is there any point in putting teflon tape on the threads to improve the
seal? How about something like a little silicone sealant around base of
the fitting after it's screwed in?
Or do I just keep tightening the thing until it seals?
Thanks for any wisdom/experience on this subject.
--
Tom Sargent
t="_blank">http://www.matronics.com/Navigator?RV-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
Message 2
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| Subject: | Re: leaking nylo -seal fittings |
I am using the insert on th 1/4" poly tubing. By "insert" I mean the little
"sleeve that fits over the tubing, not the other free floating piece that
goes inside the fitting. However, that's not the part that's leaking (I
think). The "nut" isn't leaking. it's the NPT part that screws into the
instrument. I'm pretty sure about this. I should devise an experiment to
prove my thinking.
It was my understanding that the free-floating inserts are not necessary
except with certain kinds of tubing. Maybe I misunderstand that. Do you
always have to use the insert?
--
Tom Sargent
Message 3
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| Subject: | Re: leaking nylo -seal fittings |
Nylo-seal claims the inserts are not needed with their tubing. Do not
believe them. Most people do not use the correct cutter for the tubing and
if the cut is not a perfect 90 degrees it will leak unless you use the
insert. Just use the insert and you will never have a leak except from the
NEW threads. Use Teflon tape or sealant there.
On Jun 23, 2014 9:13 AM, "Thomas Sargent" <sarg314@gmail.com> wrote:
>
>
> I am using the insert on th 1/4" poly tubing. By "insert" I mean the
little "sleeve that fits over the tubing, not the other free floating piece
that goes inside the fitting. However, that's not the part that's leaking
(I think). The "nut" isn't leaking. it's the NPT part that screws into the
instrument. I'm pretty sure about this. I should devise an experiment to
prove my thinking.
>
> It was my understanding that the free-floating inserts are not necessary
except with certain kinds of tubing. Maybe I misunderstand that. Do you
always have to use the insert?
>
>
> --
> Tom Sargent
>
>
Message 4
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| Subject: | Re: leaking nylo -seal fittings |
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Message 5
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| Subject: | Re: leaking nylo -seal fittings |
NPT
On Jun 23, 2014 9:22 AM, "don van santen" <donvansanten@gmail.com> wrote:
> Nylo-seal claims the inserts are not needed with their tubing. Do not
> believe them. Most people do not use the correct cutter for the tubing and
> if the cut is not a perfect 90 degrees it will leak unless you use the
> insert. Just use the insert and you will never have a leak except from the
> NEW threads. Use Teflon tape or sealant there.
> On Jun 23, 2014 9:13 AM, "Thomas Sargent" <sarg314@gmail.com> wrote:
> >
> >
> >
> > I am using the insert on th 1/4" poly tubing. By "insert" I mean the
> little "sleeve that fits over the tubing, not the other free floating piece
> that goes inside the fitting. However, that's not the part that's leaking
> (I think). The "nut" isn't leaking. it's the NPT part that screws into the
> instrument. I'm pretty sure about this. I should devise an experiment to
> prove my thinking.
> >
> > It was my understanding that the free-floating inserts are not necessary
> except with certain kinds of tubing. Maybe I misunderstand that. Do you
> always have to use the insert?
> >
> >
> > --
> > Tom Sargent
> >
> >
>
Message 6
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| Subject: | Re: leaking nylo -seal fittings |
Tom,
I said insert but I should have said "tube support". They look like this:
[image: Inline image 1]
=8BThey fit inside the end of the tube.
You're right, according to a note from McMaster-Carr, they aren't needed
for harder tubing=8B:
"Tube supports are recommended for polypropylene, polyethylene, and nylon
tubing with a hardness of Shore A70 or less".
I tubing I prefer is pretty soft, almost rubbery. I use tube supports
anywhere there's a B-nut.
If you have some smooth-jawed vice grips or some other clamp, you can clamp
pinch the tubing to isolate various sections as you chase down the leak.
--Dave
On Mon, Jun 23, 2014 at 9:07 AM, Thomas Sargent <sarg314@gmail.com> wrote:
>
>
> I am using the insert on th 1/4" poly tubing. By "insert" I mean the
> little "sleeve that fits over the tubing, not the other free floating pie
ce
> that goes inside the fitting. However, that's not the part that's leakin
g
> (I think). The "nut" isn't leaking. it's the NPT part that screws into th
e
> instrument. I'm pretty sure about this. I should devise an experiment t
o
> prove my thinking.
>
> It was my understanding that the free-floating inserts are not necessary
> except with certain kinds of tubing. Maybe I misunderstand that. Do you
> always have to use the insert?
>
>
> --
> Tom Sargent
>
> *
>
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> *
>
>
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