hi Durga

stress classification defined by Asme section-8 div-2 is different from Piping code.

In piping code bending stress is calculated from bending moment while Asme section-8 div-2 bending stress is the changing stress through the wall.


Also note that as per Asme section - 8 div-2 the bending stress terms caused by external moment or internal pressure in the vessel wall should be classified as secondary stress(Q)regardless of whether they are caused by sustained or expansion.which cause Pb to disappear in the equation.


Regards
Jaypipingstress@gmail.com