A 1000-ft-long 2-ft-diameter concrete pipe (sharp-edge entrance) is used to convey 60°F water from Reservoir A to B. At the end of the pipe, a diffuser with an exit diameter of 3.5 ft is installed to reduce discharge loss. If the friction loss in the diffuser is negligible, determine the flow rate in the pipe. Consider the expansion loss of the diffuser as the difference of the pre- and post-expansion velocity heads. V200 ft Reservoir A D=2 ft, L= 1000 ft V 100 ft 3.5 ft Reservoir B

A pump draws water from a sump through a vertical 6" pipe. The pump has a horizontal discharge pipe 4" in diameter that is 10.6 ft above the water level in the sump. While pumping 1.25 cfs, gases near the pump at the entrance and discharge read -4.6 psi and +25.6 psi, respectively. The discharge gage is 3.0 ft above the suction gage. Compute the horsepower output of the pump and the head lost in the 6" suction pipe.Answer: 10.7 hp, 2.4 ft

3- The pump of waste water of concentration (1.5 mg/liter) treatment plant system is powered by a (15 kw) electric motor whose efficiency is (90%). The water flow rate of the pump is (50 L/sec).The diameter of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pressure at the inlet and outlet of the pump are measured to be (100 Kpa) and (300 kpa) absolute, respectively. Determine the mechanical efficiency of the pump.

8-22C Consider fully developed flow in a circular pipe with negligible entrance effects. If the length of the pipe is doubled, the head loss will (a) double, (b) more than double, (c) less than double, (d) reduce by half, or (e) remain constant.