your right...but vendor data I have only below information

Head crown radius = 68 in
Head wall thickness = .1968 in
Head Material allowable stress = 12000 psi
Inlet Design Pressure = 228 psi
Inlet Design Temp = 770 deg F
Nozzle outside Diameter = 18 in
Flange allowable pressure at 770 Deg F 1045 psi
Flange Raised face OD 21 in
Max allowable axial load (+=up) Fz 4116 Ib
Max allowable overturning moment X-plan (Mx) 3430 ft.lb
Max allowable overturning moment X-plan (My) 3430 ft.lb

Now tell how to proceed with this information for better results in my moments.