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Thread stress of pressurized valve cap

wolfours

Mechanical
Jan 16, 2025
1
Hi guys.
I need help approaching this problem.
Hope you like my paint illustration.

What you see is a valve body made of aluminium. This is a small part of the valve but I'm right now focusing on the structural integrity of the brass cap/aluminium body threads. My goals is to investigate the stress induced on the threads and calculate a roughly approximated safety factor.
For a given thread size, pre-torque and internal pressure, what stress can be found in the threads of the cap?
I'm asking for help with the METHOD of calculating it by hand, therefore I have not included all data. I'm just out for estimates.
 

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This is pretty basic. How do you think you should calculate it?
 
By what method is the plug secured? Is it torqued to load it in compression at the conical surfaces?
 

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