The calculated values are 62.1 Ksi is the maximum normal stress.
Max. Shear stress is 31.05 ksi.
Assuming inner vessel pressure is 60 psi
t=0.375 in, which is the thickness of the vessel's wall
d0/2 -t where r = inner radius
13 x 12 Equals 156 inches, or d0=13 feet in inches.
=78 - 0.375
=77.625 in
The formula for calculating the maximum normal stress in a spherical container is
σ=pr/2t
= 60 x 77.625/ 2 x0.375
100 / 6210 psi = 62.1 Ksi
Shear tension at its maximum, max = max /2
62.1 Ksi/2
=31.05ksi
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