Can anyone tell me the working pressure for a pipe with that diameter?

Thanks

You didn't post a temper. That is something you will wish to find before commencing. The "T6" in "6061 T6" is the temper.

Some information on aluminum.

http://en.wikipedia.org/wiki/6061_aluminum

There is a handy little calculator for determining working pressure here;

http://www.engineersedge.com/pipe_bust_calc.htm

Use an adequate safety factor,(3+) and I suggest using the yield strength where it calls for tensile strength.

WOW, thanks for that link. By the way, the aluminum is 6061 T6. I was thinking of making a bulk fill adapter valve to mate with the standard valve body on the 22x0. I wanted to extend the inside of the valve by drilling deeper into that bulk fill adapter, increasing volume. My concern was the wall thickness right after the threading on that part, where the #9 o-ring goes, would be too thin to hold the 900 PSI of the C02. That calculator gives (the bar has a yield of 40kpsi) a working pressure of 4800PSI. Does that sound right?

Thanks,

Ben Benson

WOW, thanks for that link. By the way, the aluminum is 6061 T6. I was thinking of making a bulk fill adapter valve to mate with the standard valve body on the 22x0. I wanted to extend the inside of the valve by drilling deeper into that bulk fill adapter, increasing volume. My concern was the wall thickness right after the threading on that part, where the #9 o-ring goes, would be too thin to hold the 900 PSI of the C02. That calculator gives (the bar has a yield of 40kpsi) a working pressure of 4800PSI. Does that sound right?


You're welcome.

That's what I get.(4800psi) Metal is stronger than many realise.

You're not modifying any threads if I'm reading that right?

I may modify the threads in a similar way that the biohazard valve reduced the threads a bit. I want to just make a (bulk fill) piece that would mate to the valve body of the standard 22x0 series, but making the hole that forms part of the inside of the valve deeper as to give the valve more volume.

Ok. Thanks for the clarification.

The loss of only a few threads shouldn't compromise the integrity of the valve overly.

If the wall is 0.0305" then the allowable pressure for that tube calcs to 1990psi
if the wall is indeed 0.061" then teh pressure is 3978psi

With 15,000psi allowable stress.

Walter...

Good catch Walter. I'm not sure how I missed that, but I did.

I'm curious about your numbers though. I can't seem to replicate them using the calculator and posted material properties. (I tried 40000psi and 35000psi)

Are you using a different calculator or am I doing something wrong?

If I've not been doing this correctly, can you tell me where I'm going wrong?

Thanks in advance.

Gippeto

What is the data on your material?

Perhaps I should have used 10,000psi as the allowable stress in ally

so if that is the case:

Thickness = ( pressure x outsideDiameter/2 )/ StressPSI

will give 1326psi

Walter....

I see. You're using Barlow's formula, and a de-rated strength.

http://www.dixiepipe.com/barlows.html

I was using the 35000psi min. yield strength from the alcoa pdf found in the wiki link, and the calculator on engineers edge. Safety factor used was 3.

Interesting how the results differ.

How are you deriving the allowable stress?

Looked this up;

2/3 yield or 1/4 ultimate??

Which one and why??

Thanks.