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The figure below shows a process for transferring an oil from a storage tank to a separation tower. The tank is at atmospheric pressure and the tower is at 12.7 psia. Nominal oil flow is 700gpm and its specific gravity is 0.94 , with a vapor pressure at the flow temperature of 90F of 13.85 psia. The pipe size is an 8-inch schedule 40 commercial steel pipe and the pump efficiency is 75%. Frictional pressure drop in the pipe is 6 psi. 1. On the figure below, there are 4 possible locations for a valve to be used to control the liquid flow rate into the tower. Where is the best possible location for the valve? Separation tower Crude tank