Today's Message Index:
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1. 07:24 AM - Re: Plumbing Instruments (Robert L. Nuckolls, III)
2. 05:08 PM - Re: Plumbing Instruments (Kelly McMullen)
Message 1
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| Subject: | Re: Plumbing Instruments |
At 11:26 AM 4/16/2021, you wrote:
>The restriction against Teflon tape applies to
>oil and fuel hoses. It has no bearing on pitot
>or static connections. There are tens of
>thousands of amateur built and certified
>aircraft flying around with Teflon tape on the
>NPT ends of the fittings without consequence.
>Note that the tape is only=C2 useful on the NPT
>ends, there is no benefit to adding it to the compression end of the
fittings.
Cessna Service Manuals circa 1976 called out
the use of teflon tape on the male fittings
of the pitot-static plumbing. Modern
nylon fittings are better fits and advertised
to seal without the use of tape. In any
case, a leak check is the controlling condition
for system integrity.
Applying tape such that the first two threads
are left exposed goes to keeping shredded
teflon from dropping into a system upon
disassembly. But Nyloseal fittings with
no tape seems to be the contemporary process
of choice.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Re: Plumbing Instruments |
The cleanest approach is the following kit:
https://www.steinair.com/product/pitot-static-tubing-port-kit/
Yes, a little pricey, but you can connect or disconnect the tubing in
seconds, and as long as your cuts are clean and straight, no leaks.
Quality pipe threads rarely need tape or paste to seal. Cheap pipe
fittings are all over the map for fit.
On 4/16/2021 10:29 AM, Robert L. Nuckolls, III wrote:
> At 11:26 AM 4/16/2021, you wrote:
>> The restriction against Teflon tape applies to oil and fuel hoses. It
>> has no bearing on pitot or static connections. There are tens of
>> thousands of amateur built and certified aircraft flying around with
>> Teflon tape on the NPT ends of the fittings without consequence. Note
>> that the tape is only useful on the NPT ends, there is no benefit to
>> adding it to the compression end of the fittings.
>
> Cessna Service Manuals circa 1976 called out
> the use of teflon tape on the male fittings
> of the pitot-static plumbing. Modern
> nylon fittings are better fits and advertised
> to seal without the use of tape. In any
> case, a leak check is the controlling condition
> for system integrity.
>
> Applying tape such that the first two threads
> are left exposed goes to keeping shredded
> teflon from dropping into a system upon
> disassembly. But Nyloseal fittings with
> no tape seems to be the contemporary process
> of choice.
>
> Bob . . .
>
> Un impeachable logic: George Carlin asked, "If black boxes
> survive crashes, why don't they make the whole airplane
> out of that stuff?"
>
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