The cylindrical section of pressure vessel (a) and spherical pressure vessel (b) both have the same internal diameter. Both pressure vessels have the same wall thickness and internal pressure. Da compare the principal stresses and maximum in-plane shear stresses for both tanks. w a Mohr's Circle for a stress element on each of the tanks' surfaces. Find and tank internal diameter = 4.0 ft wall thickness = 1/8 in internal pressure = 150 psi Ans (Cylindrical tank) o, = 28.8 ksi σ,-14.4 ksi τmax in-plane = 7.2 ksi o,vg = 21.6 ksi Ans (Spherical tank) o, = 14.4 ksi = 14.4 ksi max in-plane o,vg = 14.4 ksi =0ksi