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Dillfamily(at)sbcglobal.n
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 Posted: Wed Jan 04, 2006 5:35 am Post subject: re: Header tank fittings |
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3/8 NPT (National Pipe Thread) .. I would go with the brass fittings you
have they will be just fine.
John,
You have a flair for brevity, but I hang on every word. Tell me why I should go with brass; because I already have them? I am so conscious of weight and the brass fittings feel so heavy in my hand. Also, I don't see how any of the responses get me any closer to how to order the correct size. You cited 3/8, but which hole is that size? Is it as easy as putting a ruler across the diameter, not so, according to Lowell. Even if I go with brass, I have to order some more and need to identify the proper sizes. I think today I will go back up to the auto parts store and look more closely to the label on the drawers the fittings are contained in. Also, I will attempt to judge whether the auto parts guy really knows what size he is selling me.
Meanwhile, this tank will not fit up to the existing tubes in my model 2, I will have to fabricate something to attach the adel clamps to on one, and maybe two, lobes. I do not have the "shielding tube" or "flange" for the gascolator drain. Are they made out of something readily available, like PVC? One thing I do have is an aluminum extention pipe that I figure I can use to move the drain valve to below the skin level.
I will throw a few more thoughts out there for comment. I have not decided yet on the routing of the fuel line after leaving the header tank. I guess I would like to run it along the left sidewall, so I won't have to worry about passengers kicking it, then though my shutoff valve in the center, and then directly through the left side of the firewall. My old gascolator is getting removed, so I don't see the sense of routing it through the right side of the firewall as it is currently. I don't see the sense of having a line bigger than 5/16, which is what this aircraft has used for 220 hours, since the factory supplied shutoff valve has an inlet and outlet of that dimension, a bigger line wouldn't make any difference.
Jeff Dill
Model 2
N767JD
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Dillfamily(at)sbcglobal.n
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bnn(at)nethere.com
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| Posted: Wed Jan 04, 2006 8:27 am Post subject: re: Header tank fittings |
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At 05:34 AM 1/4/2006, you wrote:
| Quote: | I will throw a few more thoughts out there for comment.
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...
| Quote: | I don't see the sense of having a line bigger than 5/16, which is what
this aircraft has used for 220 hours, since the factory supplied shutoff
valve has an inlet and outlet of that dimension, a bigger line wouldn't
make any difference.
|
Hi Jeff,
I don't really feel comfortable telling you all about my system
since it's not flying yet and may not work! (Actually I'm quite sure it
will because it's quite simple, but you know what I mean.) I can tell you
why, though, you would use larger line than adjacent end fittings would
seem to indicate. First, for long runs it cuts down the pressure drop,
which is inversely proportional to the ID of the tube/pipe. Second, it
makes it much easier for bubbles to propagate out of the system.
I'll also offer some info on pipe sizes to help you in your
search: (Pardon the format. Tables never come through text email right so
I'll use comma delimited fields.)
Nominal size (NOT the inside diameter), outside diameter
1/8", .405"
1/4", .54"
3/8", .675"
1/2", .84"
3/4", 1.05"
diameter is determined by the wall thickness, which is a structural
consideration. I used 3/8, .035" wall tubing for most of my fuel system. I
used the 5052-0 straight runs from Aircraft Spruce because I wanted the
runs to look neat and straight between bends. I used 1/4, .035" for my vent
from the header to the right tank, though in retrospect it might have been
better to go 3/8" in the vent to help the bubbles move.
the outside diameter is determined by the construction.
Again, watch the compression fitting angles. I used AN hardware so
all angles are 37 degree. Even my brass barbed fittings at the end of my 1'
hose into each wing tank are 37 degree, obtained from a web vendor. (I can
dig it up if you'd like.) It's certainly no problem to use all brass 45
degree plumbing fittings. I can't imagine the weight is consequential. (I
used AN fittings because I thought they looked so COOL! How's that for
laughs!)
Guy
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7suds(at)Chartermi.net
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| Posted: Wed Jan 04, 2006 8:06 pm Post subject: re: Header tank fittings |
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Jeff,
The routing of the gas line on my 5 runs from the header tank behind the
passenger side seat straight across towards the pilot side until it reaches
the center then turns towards the firewall running right up the center of
the seat to the shutoff valve located on the center counsel, then out of the
shutoff to the firewall. Looks to be a good routing direction.
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