A power plant requires 940 L/min of water. The required net head is 5 m at this flow rate. An examination of pump performance curves indicates that two centrifugal pumps with different impeller diameters can deliver this flow rate. The pump with an impeller diameter of 203 mm has a pump efficiency of 73 percent and delivers 10 m of net head. The pump with an impeller diameter of 111 mm has a lower pump efficiency of 67 percent and delivers 5 m of net head. What is the ratio of the required brake horse power (bhp) of the pump with 203-mm-diameter impeller to that of the pump with 111-mm-diameter impeller? (a) 0.45 (b) 0.68 (c) 0.86 (d) 1.84 (e) 2.11

A certain hydropower plant is being supplied by river flow of 900 cubic ft/sec and the head on the site is 200 ft. To develop maximum capacity it was proposed to install 2 turbines, one of which is 1.5 times the capacity of the other. Both turbine units are assumed to have efficiency of 85%. Determine (a) the total power developed, (b) what is the power developed by turbine #1 and by turbine #2 and (c) Rotative speed of each turbine unit assuming specific speed equal to 70 rpm.

A hydropower plant will be built in a river with average flow rate (qv) of 400 m3/s and head (H) of 25 m over the plant. Ratio between maximum flow rate through turbines and river average flow rate (R) is chosen as 1.3. The plant will be equipped with three similar turbines in parallel, the rotational speed of each turbine is 150 rpm, and the runner blade tip tangential speed (U) is assumed to be 1.5 times the ideal discharge velocity with the given head. With the given information    calculate:  Theoretical power of the plant with the average flow rate of the river (MW)?  Turbine specific speed nq?   Turbine runner diameter (m)?

B- For each statement about centrifugal pumps, choose whether the statement is true or false, and discuss your answer briefly: 1-A centrifugal pump with radial blades has higher efficiency than the same pump with backward-inclined blades. 2-A centrifugal pump with radial blades produces a larger pressure rise than the same pump with backward- or forward-inclined blades over a wide range of 3-A centrifugal pump with forward-inclined blades is a good choice when one needs to provide a large pressure rise over a wide range of volume flow rates. 4-A centrifugal pump with forward-inclined blades would most likely have less blades than a pump of the same size with backward-inclined or radial blades. T

A pump draws water from a reservoir and conveys it to another reservoir 30 m above. The suction pipe is 100 mm in diameter and 10 m long while the delivery pipe is 100 mm in diamter and 150 m long. if the the velocity in the pipe is 3 m/s, the friction factor of the pipe 0.008, and the pump and motor efficiencies are 85 % and 92 %, respectively. Assume height of pump/motor negliglible. Q1. Calculate the gauge pressure at the pump's inlet (at C) (kN/m2) Q2. Calculate the gauge pressure at the pump's outlet (at D) (kN/m2) Q3. Calculate input power to motor (kW)

ENPY = (+ 3.2 cm. Centrifugal pump rotates at 1500 rpm. Water enters the wings normally and exits by 38 degrees from the radial direction. The volumetric flow rate is given as 0.25 m^3/s. By accepting the yield as 100%; A centrifugal pump impeller has an inlet radius of 15 cm and a blade width of 6.3 cm. Its radius at the exit is 35 cm and its wingspan is (a2 = 38°) (Psu = 998 kg/m³) P1 + as 29 pg P2 + d2 29 pg L V² hg sûrekli= f-52g + zz + hpompa.f + hearbing + hg,toplam Re = p.V. D + z2 1.11 = -1.8 log Re 6.9 ɛ / D hkyerel = KK 29 Wmil = 3.7 hg,toplam= hx,sarekli + hx.yerel Протра H = pg z/1ẠM Nsp = (gH)³/4 ротра giris Wmil,B WmilA WR %3D PR (we PA b) Find the required shaft power for the centrifugal a) Find the manometric head provided by the centrifugal pump. pump. 28092 W 17,05 m O 42087 W 21,28 m O 38085 W 13,67 m O 45765 W 12,23 m O 35063 W 15,56 m

An existing pump is used to pump water with the following data at BEP: D = 2.15 in, N = 1784 rpm, ρ = 998 kg/m3, Q = 18 gpm, H = 4.2 ft. A larger pump is to be designed based from the existing one to be used for pumping slurry (ρ = 1220 kg/m3) such that its best efficiency point occurs as close as possible to a volume flow rate of 48 gpm and at a net head of 15 ft. Calculate the new pump diameter in inches. Round off your final answer to 3 decimal places.

pump rated at 700W is used to transfer water from an open tank at ground level, to another open tank 18m above ground at a rate of 3.25 kg/s. Neglecting friction losses, determine the efficiency of the pump. 81:98% 67.42% 88.29% 58.94% Which among the following is an assumption made by the Bernoulli equation? the pump must operate at 100% efficiency the flow is comppletely horizontal. friction is negligible in the flow the pressure on one side must be atmospheric

Water from a reservoir is pumped over a hill through a pipe 450 mm in diameter and a pressure of 1 kg/cm2 is maintained at the summit. Water discharge is 30 m above the reservoir. The quantity pumped is 0.5 m3/sec. Frictional losses in the discharge and suction pipe and pump is equivalent to 1.5 m head loss. The speed of the pump is 800 rpm what amount of energy must be furnished by the pump, kW?

A turbine is discharging 10 m/s under a head of 22 m at 200 rpm. The efficiency is 90%. Determine the performance of turbine under a head of 44 m.