Solution to Problem 134 Pressure Vessel

Total internal pressure:
$P = p (\frac{1}{4} \pi D^2)$
 

Resisting wall:
$F = P$

$\sigma A = p (\frac{1}{4} \pi D^2)$

$\sigma (\pi Dt) = p (\frac{1}{4} \pi D^2)$

$\sigma = \dfrac{pD}{4t}$

$8000 = \dfrac{p(4 \times 12)}{4(\frac{5}{16})}$

$p = 208.33 \, \text{psi}$           answer