ASME III, NE-3300 Design by Formula suggests minimum thickness of a cylinder for internal pressure. The formulae are well understood. Can we reduce the thickness if we use NE-3200 Design By Analysis by satisfying the stress limits using detailed stress analysis by ANSYS?

In fact, my proposed vessels have some what special features like corrugated sheets and / or rib like stiffeners.

AS PER PARA NB-3311 (b) ,NB 3300 SHALL GOVERN IN CASE OF CONFLICT BETWEEN NB 3200 & NB3300

Thanks for your kind reply.
But according to NE-3131 (as mentioned in the following) NE-3200 is compulsory where as NE-3300 is purely a matter of choice. Can you please review your answer according to NE-3131? According to my knowledge, there is no conflict between NB-3200 and NB-3300.

NE-3130 GENERAL DESIGN RULES
NE-3131 General Requirements
(a) The containment vessel design shall be such that the rules of NE-3200 (Design by analysis) are satisfied. However, in the absence of substantial mechanical or thermal loads other than pressure, the rules of NE-3300 (Design by Formula) may be used in lieu of the rules of NE-3200 for those configurations which are explicitly
treated in NE-3300.

I AM EXTREMELY SORRY.

BY MISTAK,I READ NB(CLASS 1 COMPONENT) IN LIEU OF NE(CLASS MC COMPONENTS)

It means that we can use NE-3200 without any consultation of NE-3300.