3-5 A water-tube steam generator operating at 2400 psia has 50-ft-high 3-in ID tubes. The pressure drop is given by 3.25 × 10-6 m², where m is the mass flow rate, in pound mass per hour. Assuming saturated water in the downcomer, a water-steam mixture in the tubes with an average density of 18 lb/ft³, and an inlet tube velocity of 3.0 ft/s, calculate the pump pressure necessary for the given flow.