I have done flange leakage analysis for a given problem but i am able to understand the results. I am attaching a word file explaining my doubt. please refer to that and let me know my mistake.

Thanks
Vineet

Your seating stress exceeds its allowable. According to ASME Section VIII Division 1 Appendix 2, you're over stressed.

Problem is "force, moment = 0"...why stress over?
my experience too...

Some ANSI flanges fail the ASME Section VIII Div 1 App 2 stress check. These ANSI flanges are "grandfathered" as being "ok" (from a stress point of view).

hum..
dear Richard Ay,
how do to solve?

You don't - I just said if it is an ANSI flange it is accepted as "ok" (from a "stress" point of view).