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13.6. The specification for a sieve-plate column is given below. Make a preliminary mechanical design for the column. Your design should include: (a) column wall thickness (b) selection and sizing of vessel heads (c) the nozzles and flanges (use standard flanges) (d) column supporting skirt. You need not design the plates or plate supports. You should consider the following design loads: (a) internal pressure (b) wind loading (c) dead weight of vessel and contents (vessel full of water). There will be no significant loading from piping and external equipment. Earthquake loading need not be considered. Column specification: Length of cylindrical section 37 m Internal diameter 1.5 m Heads, standard ellipsoidal 50 sieve plates Nozzles: feed, at mid-point, 50 mm inside diameter; vapour out, 0.7 m below top of cylindrical section, 250 mm inside diameter; bottom product, centre of vessel head, 50 mm inside diameter; reflux return, 1.0 m below top of cylindrical section, 50 mm inside diameter Two 0.6-m-dia. access ports (manholes) situated 1.0 m above the bottom and 1.5 m below the top of the column Support skirt height 2.5 m Access ladder with platforms Insulation, mineral wool, 50 mm thick Materials of construction: vessel stainless steel, unstabilized (304); nozzles as vessel; skirt carbon steel, silicon killed Design pressure 1200 kN/m Design temperature 150C Corrosion allowance 2 mm. Make a dimensioned sketch of your design and fill out the column specification sheet given in Appendix G