ASME Design Calculations requirements for Aluminum Extruded Profiles

[CSunny]

I am trying to design an evaporator using an aluminum extruded profile as shown in the attached images. What paragraph in ASME section VIII governs the design pressure calculation for these kind of extruded profiles? Any help is appreciated.

 

[dik]

I'm not into extruded pipes, but I would think the outer tube would be designed for tension due to 300 psi and the inner tube would be designed for compression of 250 psi. You can use the elastic shortening of the 'ribs' to get a handle on the tensile force, as a guess... else you can do an FEM analysis to get more correct values. Just a WAG...

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-Dik