A process vessel $12ft$ inside diameter and $30ft$ from tangent line to tangent line height is required to process petroleum hydrocarbons at $150$ and $230F.$ The steel used in fabricating the shell and formed heads is SA$-285$ Grade C$,$ and joint efficiency of $0\mathrm{.}85.$ The dished head has a radius of $36$ in and a knuckle radius sf $4$ in$.$ The design of the shell and formed heads should be according to code specifications. The corrosion allowance is $\frac{1}{8}$ in$.$ Determine the total weight of the shell and formed heads if the density of the steel is $490l\frac{b}{f}{t}^3.$ Select suitable formed heads for the vessel and determine their thickness and dimensions.