The pump with the characteristic curves given below is installed as shown in the figure. The pressure in the tank headspace is 1,600 mmHg, and the desired flowrate is 2.2 10^4 gpm. If frictional head loss from the reservoir to the pump inlet is 11.0 feet, at what elevation should the pump suction be placed relative to the feed tank fluid level to avoid cavitation for water at 122F? All piping is nominal 6-inch Schedule 40 standard steel pipe.

Capacity, 1,000 gpm