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kelmonroe(at)comcast.net
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 Posted: Sun Mar 28, 2010 4:06 pm Post subject: Aluminum Tubing |
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I am replacing air lines in my CJ and I need a source to buy bulk 6mm tubing from. Thanks Kelley Monroe
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radiopicture
Joined: 23 Jun 2008
Posts: 263
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| Posted: Sun Mar 28, 2010 5:10 pm Post subject: Aluminum Tubing |
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I do as well, in case you need a second source.
On Mar 28, 2010, at 8:03 PM, Kelley Monroe wrote:
| Quote: | I am replacing air lines in my CJ and I need a source to buy bulk 6mm tubing from. Thanks Kelley Monroe
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href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-List
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dsavarese0812(at)bellsout
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| Posted: Mon Mar 29, 2010 4:52 am Post subject: Aluminum Tubing |
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You can also use 1/4" aluminum tubing with AN4 sleeves http://www.aircraftspruce.com/catalog/hapages/an819.php and the original Chinese flare nuts. You may have some difficulty getting the Chinese sleeves off the ends of the old tubing.
Dennis
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Noplugs
Joined: 27 Aug 2009
Posts: 35
Location: Houston, TX
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| Posted: Mon Mar 29, 2010 4:58 am Post subject: Re: Aluminum Tubing |
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Why don’t you just convert to #4 AN tubing. (6mm=.236”) and (.25”=6.35mm). So #4 tubing is a little larger (.014”), and the flare is the same angle (real close). You will need to use the AN collars with the AN tube, then drill out the Metric B-nut to accept the AN collar. Now if all things are equal you would be opening the B-nut .014” in diameter. Not enough material to change the strength of the B-nut.
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wlannon(at)persona.ca
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| Posted: Mon Mar 29, 2010 9:47 am Post subject: Aluminum Tubing |
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Converting to 1/4" tubing is quite workable but there are a few things one should know.
You do not want to use "aluminum" tube. The Chinese tubing is a high quaility alloy very similar (or likely identical) to AMS 5052. It has a wall thickness of 1 mm (.040").
The replacement must be at least equal in strength which is a function of material specs., diameter and wall thickness.
The replacement must therefore be AMS 5052, 1/4" X .049".
The generally available 5052 tube is 1/4 X .035. which due to larger dia. and thinner wall does meet the strength requirement.
The heavier wall is available a slightly higher cost.
Do not even consider using the much cheaper aluminum tubing availabe in coil form. This is,at best, 3000 series and has a strength somewhat better than cheddar cheese.
Do yourself a big favour and buy a Parker aviation flaring tool.
Walt
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Noplugs
Joined: 27 Aug 2009
Posts: 35
Location: Houston, TX
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| Posted: Tue Mar 30, 2010 8:07 am Post subject: Re: Aluminum Tubing |
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Here is a site that has some good information on 5052 tubing
http://www.mechanicsupport.com/tube_strength.html
"A 1/4 inch (0.025) aluminum tubing can hold 3,500 psi of pressure. The same aluminum tubing, but in 1/2 inch can only hold 1,800 psi. If we made a business jet pressurized fuselage out of the same tubing, it could only handle 182 psi."
I was a hydraulic tech in the AF for 20years and 5052 tubing was good for pressures under 1500psi and we all know we see about half of that pressure. Now if you use 6061 hard tubing you can go to 3000psi
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gill.g(at)gpimail.com
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| Posted: Tue Mar 30, 2010 8:44 am Post subject: Aluminum Tubing |
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Check your calcs on jet fuselage.
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Noplugs
Joined: 27 Aug 2009
Posts: 35
Location: Houston, TX
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| Posted: Tue Mar 30, 2010 9:03 am Post subject: Re: Aluminum Tubing |
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There not my calculations they are quoted from the site. As I understood their idea, was if a seamless tube of 5052 could be made to the size of an aircraft fuselage it could hold that pressure. What size were they suggesting, from a Lear to a 747 I don't know. We all know no riveted fuselage could even get near 182psi
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gill.g(at)gpimail.com
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| Posted: Tue Mar 30, 2010 10:10 am Post subject: Aluminum Tubing |
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It's not the rivets but the thickness of the skin that is the problem.
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