The Biplane Forum > General Discussion > Hangar Talk > Looking for a bulkhead fitting


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Old 03-14-2012, 02:09 AM   #1
jgnunn
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I am looking for a straight bulkhead fitting like this:
http://www.aircraftspruce.com/catalog/hapages/an832.php
But, with a -3 on the short end and -4 on the other, in steel...having trouble finding one....any pointers?




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Old 03-14-2012, 02:26 AM   #2
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Don't think I've ever seen one. You may need to make an adapter.

Just curious, what are you doing?




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Old 03-14-2012, 02:34 AM   #3
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Smoke oil line pass through firewall. I have one, but it's aluminium.
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Old 03-14-2012, 02:36 AM   #4
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Didn't see any bulkhead fittings, but found this one:

http://www.jegs.com/i/JEGS-Performance-Products/555/105210/10002/-1?parentProductId=752560


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Old 03-14-2012, 02:46 AM   #5
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That one on jegs.com is alum.



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Old 03-14-2012, 02:51 AM   #6
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Crap...so it is!

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Old 03-14-2012, 02:52 AM   #7
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"
Endura offers the protection of stainless steel but the weight of aluminum."

Looked a little more.. melting point of that fitting (nickel) is only slightly higher than aluminium..so nope.

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Old 03-14-2012, 03:22 AM   #8
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OK. I can use a -4 in steel:http://www.aircraftspruce.com/catalog/hapages/an832.php
But I now cannot find a steel flare reducer -4 female to -3 male :0\
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Old 03-14-2012, 03:44 AM   #9
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So, I can go from this:http://www.summitracing.com/parts/FRA-583204/
to this:http://www.summitracing.com/parts/AER-FBM2749/

But I need a steel union female -4 between the two, ...can't source it after endless searching.,,
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Old 03-14-2012, 08:30 AM   #10
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<div style=": rgb(255, 255, 255); margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; font-family: Verdana, Arial, Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: normal; font-size: 12px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-com-fill-color: rgba(175, 192, 227, 0.230469); -webkit-com--color: rgba(77, 128, 180, 0.230469); ">Hi, if you can flare steel tube and use steel couplings you could make your own female coupling.<div style=": rgb(255, 255, 255); margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; font-family: Verdana, Arial, Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: normal; font-size: 12px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-com-fill-color: rgba(175, 192, 227, 0.230469); -webkit-com--color: rgba(77, 128, 180, 0.230469); ">
http://www.aircraftspruce.com/catalog/hapages/an818.php<div style=": rgb(255, 255, 255); margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; font-family: Verdana, Arial, Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: normal; font-size: 12px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-com-fill-color: rgba(175, 192, 227, 0.230469); -webkit-com--color: rgba(77, 128, 180, 0.230469); ">
<div style=": rgb(255, 255, 255); margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; border-top-width: 0px; border-right-width: 0px; border-bottom-width: 0px; border-left-width: 0px; border-style: initial; border-color: initial; font-family: Verdana, Arial, Helvetica, sans-serif; color: rgb(0, 0, 0); font-weight: normal; font-size: 12px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-com-fill-color: rgba(175, 192, 227, 0.230469); -webkit-com--color: rgba(77, 128, 180, 0.230469); ">
David


Edited by: dr107flyer
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Old 03-14-2012, 09:37 AM   #11
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beej, let me know if you dont find any thing soon, i can make you up a custom fitting at work.......
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Old 03-14-2012, 10:10 AM   #12
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Put a 4 bulkhead thru the firewall . Run a 12inch 4 hose to a tee and 3 hose from tee to exhaust pipes. Asuming pump is aft of firewall and two pipes for smoke.
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Old 03-14-2012, 12:25 PM   #13
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Beej, any reason you just don't want to use the aluminum one? I know anything under a -8 fwf is "supposed" to be steel, but in our hanger right now is 3 cessna 210s, a Comanche, 2 Cessna 340s and a king air. I checked everything but the king air...... All fittings on every plane going through the firewall are aluminum bulkhead fittings. Oil press, fuel press, map, main fuel lines..... Etc...... Fyi
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Old 03-14-2012, 12:26 PM   #14
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Try this part number: 963243 on this page http://www.anplumbing.com/Adapters/Steel-13.html
I think it's what you are looking for.
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Old 03-15-2012, 02:34 AM   #15
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Close...but in reverse...thanks for trying..
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Old 03-15-2012, 09:31 AM   #16
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beej, did you see my post above?
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Old 03-15-2012, 10:36 AM   #17
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Why do you want to reduce the smoke line from -4 to -3 anyway? Why not simply use -4 all the way and drill a -3 size hole in the exhaust?
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Old 03-15-2012, 12:40 PM   #18
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That's what is in the kit from smokingairplanes... the braided steel line is a -3. I was just replacing the supplied fitting.
I was actually mulling over this last night (yet again), and it seems to me that it doesn't matter how big the lines are or how good a pump is; everything is dictated by the smallest bore in the system. Am I correct on that notion?
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Old 03-15-2012, 12:46 PM   #19
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Quote:
Originally Posted by smizo
beej, did you see my post above?
Ja, very busy at work tho.. (server move, ugh).
My reasoning for steel:
The gas tank is right behind the firewall. I have seen pics and video of firewall tests and aluminum melts in seconds, not minutes...with flames being fanned at 120mph+, one pic showed a small hole in a firewall looking like a mini blow torch orifice...it kind of put me off a little. I'll just feel better tightening the firewall down the best I can to give me several precious minutes in the event of fire issues..
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Old 03-15-2012, 07:56 PM   #20
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"Why do you want to reduce the smoke line from -4 to -3 anyway? Why not simply use -4 all the way and drill a -3 size hole in the exhaust?"


John,


I don't think many of usrealize how much pressure we loose in a smoke oil linedue to friction loss. In the fire service we use 5" hose from the hydrant to the pumper, and to make long hose lays. Friction loss is 3lbs/100ft of hose at 100psi and 250gal/min.Using the same pressure and gpm on a 2-1/2" hose runs thefriction loss up to 15psi/100ft, and a 1-3/4" hose is 35psi/100ft!Friction loss is an inverse function of the square of the area, so it gets really important with small diameter tubes like we run our smoke oil through.


We use -6 tube and hose to supply our engines with fuel, which has very low viscosity, and at flow rates up to about 30gph. Then we try to pump smoke oil, which is much more viscous than gasoline, through a smaller diameter line and at flow rates of more than 60gph. That doesn't make any sense.


I run -6 lines for my smoke system from the tank to the nozzle, then let the nozzle be the flow restrictor. That way I have very little friction loss, and can adjust the nozzle orfice to get the flow and smoke I need. I run my smoke pump at 15psi, and get really good smoke with a 1/8" nozzle orifice.


Danny
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Old 03-15-2012, 10:25 PM   #21
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OK. The origin of this thread is going to morph, a little.... I am going to deviate (again) from the kit and not reduce till I hit the stack. I'll need another SS hose, which isn't such a bad idea, since the -3 supplied' is a 'one length fits all' thing...now I can have one made to length for my specific scenario....thanks
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Old 03-17-2012, 06:54 PM   #22
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DOUBLE+ is quite a bit more than only slightly----- I.E.---

Melting points---Aluminum--660°C---alloys, slightly less
Nickle---- 1440°C

There are carbon steel &amp; Stainless steel fittings, but any of them
have a whole lot higher Melt point than aluminum... Jerry

ps, could you have compared °F vs °C ??


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Old 03-17-2012, 09:33 PM   #23
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Looks like that's exactly what I did.


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