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Home depot aluminum tubing

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Home depot aluminum tubing

Unread postAuthor: daccel » Thu May 21, 2009 11:18 pm

I'm considering using it as a chamber and am trying to figure out the burst pressure. But the manufacturer's website doesn't give any details.

What would be a good estimate for tensile strength to plug into the calculator?

It's the tubing they have with all the other metal tubes, bars etc. 1.25" OD 3/64" wall.
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Unread postAuthor: Moonbogg » Fri May 22, 2009 1:52 am

We have to know what type of aluminum and the heat treat. Totally critical. You have a part number?
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Unread postAuthor: LeMaudit » Fri May 22, 2009 8:31 am

One day, a guy told me that the aluminum/brass stock you find at Home Depot is bulk buy of cheap metal stock, coming from who knows where.

I have no idea if this is true (maybe others will comment), but I would be more comfortable using rated cooper tubing, using the tables found in the Cooper Tube Handbook.
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Unread postAuthor: jeepkahn » Fri May 22, 2009 11:00 am

LeMaudit wrote:One day, a guy told me that the aluminum/brass stock you find at Home Depot is bulk buy of cheap metal stock, coming from who knows where.

I have no idea if this is true (maybe others will comment), but I would be more comfortable using rated cooper tubing, using the tables found in the Cooper Tube Handbook.


What is this COOPER you speak of??? Is it listed with the Unobtainium in Mcmasters book??? lol
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Unread postAuthor: LeMaudit » Fri May 22, 2009 11:07 am

My bad... I should have said "cuivre", but I guess few would have understand ;-)
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Unread postAuthor: jeepkahn » Fri May 22, 2009 11:30 am

LeMaudit wrote:My bad... I should have said "cuivre", but I guess few would have understand ;-)


I just wanted to beat JSR to the punch......

bot... the tags on the aluminum at my home depot specify 6061-t6... check the tag closer... if it doesn't specify, I'd shy away...
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Unread postAuthor: jimmy101 » Fri May 22, 2009 12:01 pm

One thing to consider is simply what the tubing is designed for. If it is conduit then it isn't going to need a pressure rating for it's intended use. Even the manufacturer might not know what the burst pressure (or pressure rating) is since it is irrelevant to the intended use.

I wouldn't trust the calculators that start with the material tensile strength and then calculate a brust pressure since you don't now how the seam was created.

Bottom line, is the pipe made to carry pressure? If it is then it'll have a pressure rating and can be used up to that pressure. If the pipe isn't designed for pressure then it won't have a rating and shouldn't be used for any purpose that involves more than a couple PSI of pressure.

I sure as heck would never use any type of pipe that didn't have a clearly defined pressure rating for a gun that I though metal was needed.
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Unread postAuthor: daccel » Fri May 22, 2009 9:40 pm

The tag specifies... 'made in China' :lol:. No useful info. Or maybe that's enough.

The manufacturer's website doesn't provide details on their products. I guess I could try contacting them.

I don't know what its intended use is, it's in the hardware section not plumbing or electrical.

There doesn't appear to be any sign of a seam.

If I make some plugs and hydro test to 3kpsi, what safety factor would you guys feel comfortable with if it was you?
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Unread postAuthor: Moonbogg » Sat May 23, 2009 1:42 am

3,000psi? Yeah i'd feel pretty safe with that. A common safety factor used for lots of things is around 4:1, and i'd feel safe enough with that. Is it going to be a hybrid or what?
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Unread postAuthor: LeMaudit » Sat May 23, 2009 8:54 am

I am guessing it should be some 6061 extruded tubing. I also have a piece from Paulin, he is just an importer, tubing is from China.
This particular aluminum is soft, I would even say gummy when it is machined on the lathe.

If you have a look to McMaster-Carr, 1 1/4" 6061 tubing with a bit thicker .049 walls is rated 735 psi. And that's for rated material!

Now the burst pressure is must certainly way higher, but still if you use unrated material there's no guaranty the next tubing you pick on the hardware store shelf will be the same. And if you test one and stress it, well, maybe not a good idea to use the tested one either :-D

I will let more experienced people comment, but I sure would not feel comfortable with this unrated large tubing with thin walls in soft aluminum.

What is the maximum pressure you need in this diameter? If it is around 400-500psi a rated copper pipe type-L would do for 1.25" ... Rona store sell short lengths...
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Unread postAuthor: daccel » Sat May 23, 2009 9:18 am

Yeah, it's for a hybrid. I wanted at least 1000psi capability, more would be nice.

I was thinking of aluminum because I wanted to do some simple machining on it in my drill press. Plus I like the look of aluminum 8).

I will check out Rona, and hunt around for shorter lengths of larger diameter copper.
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Unread postAuthor: LeMaudit » Sat May 23, 2009 9:41 am

Rona, Reno and Home Depot have type L and M copper tubing. I don't know about Home Hardware, I guess it is the same.

I am pretty sure I've seen yesterday at Rona some 36" lengh 1" dia. type-L copper tubing (stronger than M because thicker walls), that's 500psi rated for annealed and 850psi for drawn. I bought smaller diameters myself.

If you like the look of the aluminum (I do too!), you could put the copper tubing inside your aluminum tubing. If I am correct with your numbers it would fit with a .03" play, and would add a feeling of additional security in case of burst :-D . And you could drill the aluminum for attachments without compromising the internal chamber.

Better be safe than sorry.
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Unread postAuthor: daccel » Sun May 24, 2009 12:16 am

Alright, I'll put the coax on hold for this build and do over under so I can use smaller copper.

Good idea with the copper inside aluminum, I will borrow that one. But it may not be tube, instead a frame, grip and stock.

Well, tomorrow is reserved for this, we'll see what emerges. Thanks for the input. :)
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