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05-26-2016, 11:45 PM
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Join Date: Sep 2014
Location: silverdale, WA
Posts: 208
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Tip: Fire Sleeve
has been mentioned in several recent posts being used in a questionable fashion. This is a good product, but it has limitations.
Use it over, or around, something that you want to keep functioning for a period of time during a fire. Fuel and oil lines are the perfect candidate, as it allows them to maintain integrity for a "less limited" period should a fire occur. This does not mean that it keeps heat off of a line or hose that is exposed to heat for an extended period, such as running a hose or engine control cable next to an exhaust pipe. Fire sleeve is simply an insulating blanket that keeps the heat gain below failure threshold for a while longer than the target would otherwise last.
If you absolutely have to place something close to a hot object, use a metal heat shield, which will reduce the radiant heat to something that is, hopefully, bearable. Otherwise, re-route that something somewhere else.
I have witnessed the point failure of an oil hose that had fire sleeve over it, but was too close to an exhaust stack. The fire sleeve did not appear distressed, but the hose cooked in a limited area and allowed all the oil to pour out, in flight. The pilot got it on the ground without further damage, but it was a close call!
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05-27-2016, 05:42 AM
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Join Date: Sep 2007
Location: Central IL
Posts: 5,514
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Excellent information for inspection!!
Moderator - move to Safety?
__________________
Bill
RV-7
Lord Kelvin:
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”
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05-27-2016, 06:51 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,584
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We certainly agree. Prior planning and thinking about how things work together generally eliminates very close routings of hoses to exhaust. But certainly, take all precautions to shield the hoses, whether they are teflon or not.
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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05-28-2016, 05:41 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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Can you tell us how close this hose was to the exhaust ?
__________________
7A Slider, EFII Angle 360, CS, SJ.
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05-28-2016, 01:28 PM
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Join Date: Sep 2014
Location: silverdale, WA
Posts: 208
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Hose clearance
was probably between 3 and 4 inches... but I did not measure it, just guessing. The real problem with this particular installation was that you could not see it, even with the cowl off.
While this was not installed on a Lycoming, the physics remain the same. It turned out that the OEM used an aluminum tube here, which was replaced at a later date by a hose... big mistake.
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