In the figure given, there are $125$ ft of $\backslash (2-\backslash )$ in pipe, $75$ ft of $6-$in pipe and $150$ ft of $\backslash (3-\backslash )$ in pipe, all iron cast. The roughness of the pipes due to the material is $\backslash (950\mathrm{.}10^\{-\}\backslash )6$ in$.$ There are two $900$ elbows $($resistance coefficient, kL$,$ is $0\mathrm{.}57$ for the $2-$in pipe$)$ and an open globe valve. The flowrate through the pipes is $\backslash (0\mathrm{.}16\backslash$mathrm$\{$ft$\}^\{3\}/\backslash$mathrm$\{$s$\}\backslash ).$ If the turbine head is $76\mathrm{.}73$ ft $,$ what is the resistance coefficient kL of the open globe?