The oil-cooler system of a ship’s turbine consists of a reservoir in which light oil is maintained at 300°F, a 200-ft segment of 3-in. schedule 40 commercial steel pipe in which oil at 300°F is transported, a heat exchanger with a head loss of 257.l3Q1.73(Q in ft3/sec and head loss in ft-lbf/lbm), a 200-ft segment of 3-in. schedule 40 commercial steel pipe in which oil at 1OO°Fis transported to a second reservoir 20 ft above the first, and a pump placed in the line containing the cold fluid.
(a) For a flow rate of 0.4104 cfs, what Goulds 3196 pump operating at 3,500 rpm would be required?
(b) What would be the operating point of the pump-system combination if a Goulds 2 X 3-10 A60 pump (Fig. 4-16) operating at 1,750 rpm with a 1O-in. rotor were installed?
(c) For part (b), find the efficiency and power required to drive the pump.
Show your analysis and explain your logic. Be careful of the definition of head, since the density changes from the 300°F fluid to the 1OO°Ffluid. Be sure to state all assumptions. A diagram of the system is given in Fig. P4-1O.