Today's Message Index:
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1. 01:34 AM - Teflon fuel line (Michael Townley)
2. 06:40 AM - Re: WireViz (prestonkavanagh)
3. 06:44 AM - Re: Teflon fuel line (Charlie England)
4. 07:00 AM - Re: Teflon fuel line (user9253)
5. 06:48 PM - Re: Teflon fuel line (johnbright)
Message 1
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| Subject: | Teflon fuel line |
Hi -This is my first question for the forum.
I may use a Teflon fuel pipe with anodized AN fittings in an RV9 between
the fuel tank and the Andair fuel selector. The anodized fittings don
=99t
seem to conduct electricity (even though the teflon fuel line has a
metal-braid covered inside a plastic covering). I wondered whether this
will be a problem/danger due to possible electrostatic charge from the
flowing fuel.
Thanks for any suggestions
Michael Townley
--
Mike Townley 0419393470
Message 2
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"I used LibreOffice Draw to make my wiring diagrams. It worked but was pretty time-consuming."
IF WireViz is the new best choice for documenting cables, what's the choice for
the schematics? I want to add details to a Z101 foundation. Absent software
it will be pencil lines on a paper printout, and that's well short of the standard.
What is the recommended software? Recognize that for me this is rare
and occasional use - I'll give up some functionality for drag and drop simplicity.
Regards, PK
--------
PBK3
PA-12, BD-4, RV6a, gliders
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497078#497078
Message 3
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| Subject: | Re: Teflon fuel line |
On Mon, Jun 29, 2020 at 3:38 AM Michael Townley <mtown52@gmail.com> wrote:
> Hi -This is my first question for the forum.
>
> I may use a Teflon fuel pipe with anodized AN fittings in an RV9 between
> the fuel tank and the Andair fuel selector. The anodized fittings don
=99t
> seem to conduct electricity (even though the teflon fuel line has a
> metal-braid covered inside a plastic covering). I wondered whether this
> will be a problem/danger due to possible electrostatic charge from the
> flowing fuel.
>
> Thanks for any suggestions
> Michael Townley
>
> --
> Mike Townley 0419393470
>
Interesting question. When Teflon lined hose 1st came on the market, there
were significant issues with static buildup due to flow in the
non-conductive hose. Because of that, I suspect that you can't even buy
Teflon lined hose these days without carbon impregnated Teflon used as the
liner. So, while I can't answer your question with authority, I don't worry
about it in my installation, since the carbon impregnated Teflon provides a
static bleed connection along all components in the fuel system, keeping
all the fuel at the same electrical potential.
Thinking about it, if the anodized fittings were a problem, then you'd have
the same issue even with aluminum 'hard line', because every joint would be
an electrical break in the path. (The male taper of the fitting would
insulate from the aluminum female on the tubing.) The old 'rubber' hoses
likely had carbon in the liner too, and we never heard about static issues
due to anodized aluminum fittings. Shucks, even the anodized fittings may
bleed off the static charge, even though they seem to check as open on an
ohm meter. 'Static straps' are usually quite high in resistance, so they
don't provide a low voltage current path to ground (think about the danger
if you're wearing a wrist strap & touch the wrong thing in a circuit....
https://en.wikipedia.org/wiki/Antistatic_device#:~:text=Antistatic%20mat,
-An%20antistatic%20floor&text=Typical%20resistance%20is%20on%20the,line%2
0in%20an%20electrical%20outlet.
I'd suggest checking with your vendor, to be sure that the hose you're
planning to use has a carbon impregnated Teflon liner.
FWIW,
Charlie
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Message 4
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| Subject: | Re: Teflon fuel line |
No danger from static for a couple of reasons.
Fuel can only ignite if it is mixed with oxygen (air). Since the fuel line does
not contain air, it can not ignite. And even if there is air in the fuel line,
the ratio of fuel to air needs to be within a certain range to ignite. The
mixture will be too rich.
Even if the fuel air ratio is ideal for combustion, there is still no need to
worry. A metal airplane like your RV-9 will keep all parts of the fuel system
at the same voltage. No sparks will jump. Some fuel systems use non-conductive
rubber hose. In that case, the danger is not from static, but from mechanical
damage or kinking.
Anodized metal fittings might not be good conductors of electricity, but will
conduct enough to prevent high voltages from building up.
--------
Joe Gores
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Message 5
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| Subject: | Re: Teflon fuel line |
mtown52(at)gmail.com wrote:
> ... I may use a Teflon fuel pipe with anodized AN fittings... between the fuel
tank and the... fuel selector... I wondered whether this will be a problem/danger
due to possible electrostatic charge from the flowing fuel.
>
> Michael Townley
>
Teflon should have an additive to make it conductive else the flow of a non-conductive
medium, like gasoline, will generate an electrostatic charge that will
punch holes in the Teflon over time. Rubber hoses are naturally conductive enough
and brake lines don't have flow. BTW I have the impression -3 hoses are not
available conductive because they are used for brake lines and there is no
flow.
Tom Swearengen is an expert you could ask. https://www.tsflightlines.com/about-us.html
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
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