Shell cover
t= P*OD*K/ (2*SE + 2*P*(K-0.1))) + cai+ cao+ tol (from ASME app. 1-4(C)) - 06

            P- Design pressure in psi.
            OD- Outside diameters of the shell cover in inches.
            S – Allowable stress for the corresponding material in psi.
            E – Weld joint efficiency in inches.
            k- 0.1667*(2+ (D/2h) ^2)
            D/2h – 2 (for ellipsoidal heads)
            Cai – Inside corrosion allowance in inches.
            Cao – outside corrosion allowance in inches.
            Tol – Under tolerance allowance and forming tolerance in inches.

Maximum allowable external pressure for shell cover:
Pa = B/ (Ro/t) - 07
            B – Factor from ASME section 2 D (Refer from page 747) (A-factor= 0.125/ (Ro/t))
            Ro – Outer radius of the shell cover in inches.
            t – Required thickness of shell cover in inches.
            Pa – Maximum allowable external pressure in psi.

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