b) Columns. Using square hollow section from the catalogue extracts provided to you at the c- reserve address given in Chapter 8 Appendix 8, design a column that matches the lug and satisfies the required "unity" equations for combined loading that have been provided to you (refer to the end of section 8-2 of the project resource material, see also AS3990 Mechanical equipment-Steelwork, eqn's 8.3.1.) This check will be done for the as new condition with the vessel full of the hydrostatic test oil. (Note that if a hydrostatic test was done late in the vessel's life stress check cales on the vessel and the columns would have to be done allowing for corrosion inside the vessel and column.) The column is to have a height, measured from the base plate to the bottom plate of the lug, of 900+XY mm. The detailed base plate design is not part of this assignment but in real life would have to be dealt with in consultation with the civil engineer responsible for the slab/footings.