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QUESTION 1: 1.1 A cylindrical vessel has external diameter 920 mm, length of 2.0 m and metal thickness of 10 mm. It has to withstand an internal pressure of 320 kPa. This cylinder vessel must be * replaced by a spherical vessel having the same internal volume, pressure and maximum hoop stress. Determine the internal diameter and metal thickness for this spherical vessel. Take the 4 d #² volume of sphere as, 3 1.2 A thin rim, 2 m external diameter is 200 mm wide and 15 mm thick. It is made in two halves which are riveted together with two single cover butt-joints each containing six rivets in total. If the rivets are 20 mm in diameter and the density of the rim material is 7.8 Mg/m². Determine the shar stress in the rivets at a speed of 600 rev/min.