process equipment design

Question 6 A) A cylindrical PV of internal diameter 20cm and thickness 5cm is subjected to an internal pressure of 5MPa. Use the Lame's equation and calculate the tangential/hoop stress at: i) The tangential/hoop stress at the inner and outer surfaces [8 marks] ii) The radial stress at the inner and middle surfaces [8 marks] B) It is desired to design a cast iron monobloc vessel of inside diameter at 20cm and internal operating pressure at 10MPa. For design permissible stress at 18MPa and using the Lame's equation, calculate the shell thickness of the vessel [12 marks]