The efficiency ? of a pump is defined as the (dimension-less) ratio of the power developed by the flow to the power required to drive the pump:
where Q is the volume rate of flow and
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- Two pumps (Pump A and B) have performance curves which can be approximated by the following equations: H_A = 340 - (1.2(Q^2)), in feet H_B = 360 - (2.5(Q^2)), in feet where Q is in ft^3/s. If pumps A and B were to operate in parallel as depicted in the figure below, at what head (in ft.) should either pump be operated?arrow_forwardA fan when driven by a 5.8 Hp motor at a speed of 800 rpm delivers 510 m3/min at a total pressure of 5 cm water gage. If in the same installation, 6.5 cm water gage pressure is required. What power will the fan be driven?arrow_forwardPlease solve it correctly,Urgent. Question: The discharge pressure of a water pump is 9, 000 kPa. The temperature is 150 deg deg C and density is 917 kg/m3. What is the equivalent pump head in meters? A. 11.005 m B. 1,000.5 m C. 1,050.5m D. 1, 100.5 marrow_forward
- A centrifugal pump when tested with Brine of density 1190 kg per cubic meter discharged 60 liter per second against a pressure of 300 kPa. It is desired to investigate the change in power when a similar pump is used to pump petrol of density 700 kg per cubic meter against the same pressure. It is desired to keep the speed the same. Check whether any change in the drive motor is required. Assume an overall efficiency of 70% in both cases.arrow_forwardData: Hp2,3 = 2 m; A3 = 20 cm²; A₂ = 1 cm²; Hp0,1 = 0.8 m; NB= 74%(pump efficiency) To determine: a) the flow (L/s); b) the area of section (1) (cm³); c) the power supplied by the pump to the fluid.arrow_forwardWater of density ? =998.2kg/m3 flows through a fireman’s nozzle—a converging section of pipe that accelerates the flow. The inlet diameter is d1 = 0.100 m, and the outlet diameter is d2 = 0.050 m. The average velocity, momentum flux correction factor, and gage pressure are known at the inlet (1) and outlet (2). (a) Write an expression for the horizontal force Fx of the fluid on the walls of the nozzle in terms of the given variables. (b) Verify your expression by plugging in the following values: ?1 = 1.03, ?2 = 1.02, V1 = 3 m/s, P1,gage = 137,000 Pa, and P2,gage = 0 Pa.arrow_forward
- A pump is installed to deliver water from a reservoir of surface elevation zero, to another of elevation 290 ft. The 10 inch-diameter suction pipe (f=0.022) is 90 ft long and the 8-in-diameer discharge pipe (f=0.028) is 4900 ft long. The pump characteristic is defined by hp= 365-20Q2 where hp, the pump head, is in feet and Q is in cubic feet per second. What is the rate at which the pump will deliver the water?arrow_forwardA pump has a characteristic curve described by the equation: hp = 15 - 0.2 x Q2 What is the pump characteristic curve for: (a) a system having three of these pumps in series; and (b) a system having three of these pumps in parallel? Sketch the pump characteristics curve for each case.arrow_forwardA certain centrifugal pump was tested and its performance curves can be approximated as follows: H = 340 - 1.2(Q2), in feet BP = (0.0521Q3) + (1.25Q2) + (11.042Q) + 134.5, in horsepower where Q is in ft3/s. If two of this pump is connected in series to deliver water to a system whose head requirement is 615 ft, what will be the operating discharge rate in ft3/s of either pumps? Assuming the head is equally divided between the two pumps, what is the efficiency of either pumps (in %)? Take the specific weight of water to be 62.4 lbf/ft3.arrow_forward
- For each statement, choose whether the statement is true or false, and discuss your answer briefly: (a) If the rpm of a pump is doubled, all else staying the same, the capacity of the pump goes up by a factor of about 2. (b) If the rpm of a pump is doubled, all else staying the same, the net head of the pump goes up by a factor of about 2. (c) If the rpm of a pump is doubled, all else staying the same, the required shaft power goes up by a factor of about 4. (d) If the rpm of a turbine is doubled, all else staying the same, the output shaft power of the turbine goes up by a factor of about 8.arrow_forwardA turbine develops 144 HP running at 100 rpm under a head of 7.7 meters. After resolving the turbine speed, what horsepower would be developed under a head of 11 meters?arrow_forward2. A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second? The correct answer has a margin of 1 from exact answer. Velocity head is neglected.arrow_forward
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