Pressure Vessel Handbook, by Eugene F. Megyesy, Tenth Edition
for internal pressure on page 22,
t = PR / SE+ 0.4P
WHERE)
P = DESIGN PRESSURE OR MAX ALLOWABLE WORKING PRESSURE
S = STRESS VALUE OF MATERIAL PSI SEE ASME PATE D
E = JOINT EFFICIENCY
R = OUTSIDE RADIUS
D = OUTSIDE DIAMETER
t = WALL THICKNESS
C.A. = CORROSION ALLOWANCE