hi,

you can alternate try this method

use WRC 107

select local loading method

take vessel dia= 1.8 Dia of vessel ( this is done to convert Cyllindrical vessel to sperical shape considering crown radius 0.9 D )

P= axial force
calculated Resulatant of VL and Vc == put in either in Vl or in VC

if you put resultant value in Vl=Vr then Vc=0

now calculate resultant of Ml and MC

put Mr in Ml=o and MC= MR


by this way you can get closer result.

this is my understanding

correct me if i am wrong!!