Stress analysis of threaded pipe joing due to internal pressure?

[ParthZala]

I want to do a stress analysis of an adapter that is designed to convert Metric thread to US standard. That converter has both female threads. I want to know how to confirm stresses at the joint with minimum computation. The pipe system is at high pressure and room temperature. It will transfer water. Adapter is just used to convert the connection.

I would really appreciate a quick help. If you can show me a reference to similar problem that would also be great.

Thank you all in advance.