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sarg314(at)gmail.com
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 Posted: Sun Jun 22, 2014 7:30 pm Post subject: leaking nylo -seal fittings |
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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
[quote][b]
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dave.saylor.aircrafters(a
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| Posted: Sun Jun 22, 2014 7:59 pm Post subject: leaking nylo -seal fittings |
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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(at)gmail.com (sarg314(at)gmail.com)> wrote:
[quote] 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
| Quote: |
t="_blank">http://www.matronics.com/Navigator?RV-List
tp://forums.matronics.com
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carl.froehlich(at)verizon
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| Posted: Mon Jun 23, 2014 5:30 am Post subject: leaking nylo -seal fittings |
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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 – 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 “tight enough”.
Carl
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Dave Saylor
Sent: Sunday, June 22, 2014 11:58 PM
To: rv-list(at)matronics.com
Subject: Re: 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(at)gmail.com (sarg314(at)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
01234567890123
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sarg314(at)gmail.com
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| Posted: Mon Jun 23, 2014 8:09 am Post subject: leaking nylo -seal fittings |
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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
[quote][b]
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vanremog(at)aol.com
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| Posted: Mon Jun 23, 2014 8:23 am Post subject: leaking nylo -seal fittings |
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I've found that Loctite PST works well in this application
Sent from my Verizon Wireless 4G LTE DROID
Thomas Sargent <sarg314(at)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
[quote][b]
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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dave.saylor.aircrafters(a
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| Posted: Mon Jun 23, 2014 8:42 am Post subject: leaking nylo -seal fittings |
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Tom,
I said insert but I should have said "tube support". They look like this:
[img]cid:ii_146c991e6fc5a49b[/img]
They fit inside the end of the tube.
You're right, according to a note from McMaster-Carr, they aren't needed for harder tubing:
"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(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: |
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
| Quote: |
t="_blank">http://www.matronics.com/Navigator?RV-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
|
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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sarg314(at)gmail.com
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| Posted: Thu Jun 26, 2014 1:33 pm Post subject: leaking nylo -seal fittings |
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Dave:
Yes, that was my main problem. A few of the fittings didn't have the "tube support". That and some teflon tape on the T's that screwed into the instruments fixed the problem.
On Mon, Jun 23, 2014 at 9:41 AM, Dave Saylor <dave.saylor.aircrafters(at)gmail.com (dave.saylor.aircrafters(at)gmail.com)> wrote:
| Quote: | Tom,
I said insert but I should have said "tube support". They look like this:
[img]cid:ii_146c991e6fc5a49b[/img]
They fit inside the end of the tube.
You're right, according to a note from McMaster-Carr, they aren't needed for harder tubing:
"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(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: |
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
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--
Tom Sargent
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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dave.saylor.aircrafters(a
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| Posted: Thu Jun 26, 2014 5:26 pm Post subject: leaking nylo -seal fittings |
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Yeah, those things seem kind of optional until you spend enough hours with the fuel valve digging into your back, looking for leaks behind the panel. I'm glad that helped.
--Dave
do not archive
--Dave
On Thu, Jun 26, 2014 at 2:30 PM, Thomas Sargent <sarg314(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: | Dave:
Yes, that was my main problem. A few of the fittings didn't have the "tube support". That and some teflon tape on the T's that screwed into the instruments fixed the problem.
On Mon, Jun 23, 2014 at 9:41 AM, Dave Saylor <dave.saylor.aircrafters(at)gmail.com (dave.saylor.aircrafters(at)gmail.com)> wrote:
| Quote: | Tom,
I said insert but I should have said "tube support". They look like this:
[img]cid:ii_146c991e6fc5a49b[/img]
They fit inside the end of the tube.
You're right, according to a note from McMaster-Carr, they aren't needed for harder tubing:
"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(at)gmail.com (sarg314(at)gmail.com)> wrote:
| Quote: |
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
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--
Tom Sargent
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| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
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