di Do A 45% An involute pump casing is approximated as a toroidal shell as shown in the figure above. It has an internal cross-sectional diameter of d; = 500 mm, an overall external diameter of Do = 1530 mm, and a wall thickness of 4.9 mm. Point A is located at mid-thickness of the wall. (a) Express and in terms of the internal pressure p. Enter only the numerical value of the coefficient associated with p. 00= 8= (b) Determine the maximum internal pressure the shell can hold, such that the Tresca stress intensity at point A does not exceed two-thirds of the yield strength oy 252 MPa. MPa