HEAT EXCHANGER E-BOOK (MECHANICAL DESIGN)
SHELL CYLINDER, FRONT HEAD CYLINDER (CHANNEL), SHELL COVER CYLINDER
Shell thickness:
Required wall thickness of cylinder, greater of
Circumferential stress
t = (P*OR / (S*E+0.4*P)) + cai + cao + Tol (From ASME Appendix. 1-1 A) - 01
Longitudinal stress
t = (P*IR / (2*S*E+0.4*P)) + cai + cao + Tol (From ASME UG-27(C) (2)) - 02
Where,
            P – Design pressure in psi.
            OR – Outer radius of the shell in inches.
            IR – Inside radius of the shell in inches.
            S – Allowable stress for the corresponding material in psi.
            Cai – Inside corrosion allowance in inches.
            Cao – outside corrosion allowance in inches.
            Tol – Under tolerance allowance in inches.
Thus from equations 1 and 2 fix the thickness value whichever is greater.
            tnom – greater of equation 1 or 2
But according to TEMA standards the minimum shell thickness for classes RCB is
shown in tables below
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