Pump A Head (ft) Pump B Нead (ft) Q (cfs) Efficiency Q (cfs) Efficiency 0.00 186 0.00 172 1.11 179 54 0.89 166 59 2.23 158 70 1.78 140 77 3.34 112 67 2.67 90 74 Problem 7: The two pumps in problem 6 are now arranged in parallel. The static head is 40 ft. The pipe diameter is 9-in of 1200 ft length and the minor loss coefficient is 20. Determine the operating condition and power output (Q, head, and efficiency) and the power output for the system of two pumps. Use f= 0.022. What is the flow rate and efficiency of each pump?

Pump A Head (ft) Pump B Нead (ft) Q (cfs) Efficiency Q (cfs) Efficiency 0.00 186 0.00 172 1.11 179 54 0.89 166 59 2.23 158 70 1.78 140 77 3.34 112 67 2.67 90 74 Problem 7: The two pumps in problem 6 are now arranged in parallel. The static head is 40 ft. The pipe diameter is 9-in of 1200 ft length and the minor loss coefficient is 20. Determine the operating condition and power output (Q, head, and efficiency) and the power output for the system of two pumps. Use f= 0.022. What is the flow rate and efficiency of each pump?

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter14: Ocean Thermal Energy Conversion And Ocean Salinity Gradient Energy

Section: Chapter Questions

Problem 14P

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1.1) A pump draws water from an open reservoir, with a static suction head of 26.24 feet, and lifts it to another open reservoir with a static discharge head of 25 meters. The diameter of the suction pipe is 15.24 cm and the diameter of discharge pipe is 4.0 inches. The total head loss from A to B is 25 % of the total dynamic head (TDH), and the head loss at the discharge side of the pump is 90 % of the total head loss. The pump capacity is 50 lps. Determine: a) the pump brake power if the efficiency is 82 % b) the reading of the pressure gauge installed at the suction side of the pump c) the reading of the pressure gauge installed at the discharge side of the pump.
Two reservoirs are connected as shown in the figure. The difference in Elevation of the two reservoirs is 6.88m. Darcy-Weisbach friction factor for all pipes, f=0.0238. Pipe 1: Length=3500m Diameter=70cm Pipe 2 and 3: Length=1750m Diameter=35cm Compute the discharge in the pipe one in L/s. Compute the discharge in the pipe three in L/s.
1] A pump draws water from an open reservoir, with a static suction headof 26.24 feet, and lifts it to another open reservoir with a static discharge head of25 meters. The diameter of the suction pipe is 15.24 cm and the diameter ofdischarge pipe is 4.0 inches. The total head loss from A to B is 25 % of the totaldynamic head (TDH), and the head loss at the discharge side of the pump is 90 %of the total head loss. The pump capacity is 50 lps. Determine: a) the pump brakepower if the efficiency is 82 %; b) the reading of the pressure gauge installed atthe suction side of the pump; and c) the reading of the pressure gauge installed atthe discharge side of the pump.
Two reservoirs ( Elev. 38.7m and Elev. 90.6m ) are connected by two pipelines 1-2 and 2-3 with a pump bridging the two pipelines. If the fluid (s.g = 0.81) flows at a rate of 174 L/s, what is the power given by pump? Assume head losses of 2.6 J/N from 1-2 and 5.5 J/N from 2 to 3
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90.Water is pumped from the reservoir with a surface elevation of 200 m across the valley to another reservoir of surface elevation 216 m through a pipe line of 1300 m long and 30 cm diameter if during pumping the pressure is 5.6 kg/cm2 at a point half way along the pipe and at an elevation of 168 m. Compute the discharge and power of the pump taking friction factor as 0.02 neglect minor losses.
Two reservoirs A and B have elevations of 250m and 100m respectively. It is connected by a pipe having a diameter of 250mm diameter and length of 100m. A turbine is insatalled at a point in between reservoirs A and B. If C=120, compute the following if the discharge flowing in the pipe is 150liters/sec. Head loss of pipe due to friction. The head extracted by the turbine. Power generated by turbine
Water is pumped from the reservoir with a surface elevation of 200 m across the valley to another reservoir of surface elevation 216 m through a pipe line of 1300 m long and 30 cm diameter if during pumping the pressure is 5.6 kg/cm2 at a point half way along the pipe and at an elevation of 168 m. Compute the discharge and power of the pump taking friction factor as 0.02 neglect minor losses.
For this system, the discharge of water is 0.15 m3 /s, x = 1.0 m, y = 2.0 m, z = 8.0 m, and the pipe diameter is 30 cm. Neglecting head losses, what is the pressure head at point 2 if the jet from the nozzle is 10 cm in diameter? Assume α = 1.0 at all locations.
A reservoir discharges a liquid to the atmosphere through a horizontal of pipes. Thepipeline consists pipe A (D= 10 cm & L = 25 m) and pipe B (D= 12 cm & L = 35 m) areconnected in series. The water level in the tank is 10 m from centreline pipe entranceand f = 0.02 for both pipe. Calculate the discharge by considering all losses.
Tank A has an elevation of 100 m and Tank B has an elevation of 160 m. Since Tank A is lower than B, engineers have installed a pump near A to transfer fluid to B. The discharge in the pipe is at 0.65 cubic meters per second and pipe has a length of 1 km. with a diameter of 0.6 meters. If Hazen williams coefficient is equal to 120, compute the head loss in the pipe.
Water flows from Reservoir A (Elev 125 m.) to a turbine (Elev 67 m.) then discharges into tailtrace B (Elev 26 m.) as shown. The head loss from (A) to (1) is 2 times the velocity head in the pipe, and the head loss from (2) to (b) is 1.97 times the velocity head in the pipe. If the flow rate in the pipe is 39 ft3/s, diameter of all pipes is 30 in, calculate the horsepower generated by the turbine. Use 1 hp = 550 lb-ft/s. ANS : 1,000,000