Estimate the thickness required for the cylindrical portion of the vessel shown in the diagram. The vessel is to be operated at a pressure of 20 bar (absolute) and temperature of 350°C. The material of construction will be carbon Manganese steel. A corrosion allowance of 2mm should be used. All the welds will be radiographed. 1.8 m. 3.5m Use Table 13.2 attached at here for the design stress. Design Stress: page_lool Material Tensile Design stress at temperature "C (N/mm²) strength (N/mm²) 0 to 50 100 150 200 250 300 350 400 450 500 Carbon steel (semi-killed or silicon killed) 360 135 125 115 105 95 85 80 70 Carbon-manganese steel (semi-killed or silicon killed) 460 Carbon-molybdenum steel, 0.5 180 170 150 140 130 115 105 100 per cent Mo 450 180 Low alloy steel (Ni, Cr, Mo. V) 550 240 Stainless steel 18Cr/8Ni unstabilised (304) 510 165 Stainless steel 18Cr/8Ni Ti stabilised (321) Stainless steel 65 549 540 165 170 145 140 130 120 110 110 240 240 240 240 235 230 220 190 170 145 130 115 110 105 100 100 95 90 150 140 135 130 130 125 120 120 115 18Cr/8Ni Mo 2 per cent (316) 520 175 150 50 125 135 120 115 110 105 105 100 95 2. An open cylindrical water storage tank has a diameter of 6 m and a height of 7 metres. Water is filled to a height of 6.6 metre. What will be the wall thickness required if the maximum permissible stress for the tanks is 80 MPa?