Texts: A cylindrical vessel is subjected to an internal pressure of 1500 kN/m². The plate material has a yield strength of 200 N/mm², and the factor of safety can be taken as 1.5. The corrosion allowance is 1.5 mm, and the joint efficiency factor is 0.85. The vessel inside diameter is 2500 mm. Find the thickness and depth of the head if the ends are: i) Hemispherical, ii) Elliptical, iii) Torispherical, and iv) Conical with a semi cone angle α = 20°.