A centrifugal pump used to take water from reservoir to another through 800 m length and 0.15 m i.d. if the difference in two tank is 8 m, calculate the flow rate of the water and the power required, assume f =0.004. Q (m3 /h) 0 23 46 69 92 115 Δh (m) 17 16 13.5 10.5 6.6 2.0 η 0 0.495 0.61 0.63 0.53 0.1
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A centrifugal pump used to take water from reservoir to another through 800 m length and 0.15 m i.d. if the difference in two tank is 8 m, calculate the flow rate of the water and the power required, assume f =0.004.
Q (m3 /h) 0 23 46 69 92 115
Δh (m) 17 16 13.5 10.5 6.6 2.0
η 0 0.495 0.61 0.63 0.53 0.1
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- PAY ATTENTION TO THE QUESTION : What is the resulting flow rate in the system if three pumps are used in parallel? (a) 0.483 m^3/s (b) 0.364 m^3/s (c) 0.333 m^3/s (d) 0.563 m^3/s 1. The Head -flowrate curve for a centrifugal pump is given by: HP = 28 -30Q2 Where, HP is in meter and Q is in m3/s . This pump is used to pump water for a system with the following (H-Q) curve: HS = 8 + 150Q2 Where, HS is in meter and Q is in m3/s . IT SAYS : if theee pumps are used in parallel PAY ATTENTION Multiple choice choose correct answerTwo identical centrifugal pumps connected in series are used to pump water between two storage tanks that are open to the atmosphere, through a cylindrical pipe with ID of 0.1 m on both the discharge and suction side. The total equivalent length on the suction and discharge sides are 20m and 40m respectively. The change in static head is 7m. Pump Data: Q( m3/s) 0 0.01 0.02 0.03 0.04 Δh (m) 23 21.5 18.5 11 3 Assume the friction factor f to be 0.02 and is constant throughout the range of flowrates. a) Determine the operating point of the system. b) Determine the power requirement for the pumping system if the pump efficiency is 75%.A hydraulic ram pump lifts 0.005 m3/s of water to a tank 20 m above the ram through a 80 m long and 6.5 cm diameter delivery pipe. Take Darcy friction coefficient ƒ = 0.01 and neglect frictional loss in the supply pipe. If the supply tank is 3 m above the ram and supplies 0.1 m3/s of water; A) Calculate Aubuisson’s efficiency, in %, of the ram pump. B) Calculate the Rankine efficiency, in %, of the ram pump.
- The net head delivered by a pump at a rotational speed of 1000 rpm is 10 m. If the rotational speed is doubled, the net head delivered will be (a) 5 m (b) 10 m (c) 20 m (d ) 40 m (e) 80 mA centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radialat the inlet of the rotor. The pump has the following characteristics:Flow rate Q = 72 L/sInlet diameter D1 = 90 mmOutlet diameter D2 = 280 mmHead H = 25mWidth at the inlet b1 =20 mmWidth at the outlet b2 = 18 mmLeakage q = 2 L/sMechanical loss Pm = 1.41 kWBlade angle at the outlet β2 = 35ͦThe water density ?=998 ??/m^3Atmospheric pressure 101 kPa1) Draw the velocity triangles at the inlet and the exit of the impeller.2) Determine the magnitude of the absolute velocity of the flow (?) and the impeller velocity(U) at the inlet and outlet3) Determine the blade angle at the inlet.4) Determine the hydraulic, mechanical and volumetric efficiencies.5) Determine the minimum number of blades required for the slip to not exceed 0.9.6) Determine the static pressure difference (P2-P1) through the impeller by using Bernoulliequation.7) Determine the available NPSH if the pump is placed 2m above the…A centrifugal pump with an overall efficiency of 0.56 rotates at 1650 rpm. The flow is purely radialat the inlet of the rotor. The pump has the following characteristics:Flow rate Q = 72 L/sInlet diameter D1 = 90 mmOutlet diameter D2 = 280 mmHead H = 25mWidth at the inlet b1 =20 mmWidth at the outlet b2 = 18 mmLeakage q = 2 L/sMechanical loss Pm = 1.41 kWBlade angle at the outlet β2 = 35ͦThe water density ?=998 ??/m^3Atmospheric pressure 101 kPa1) Draw the velocity triangles at the inlet and the exit of the impeller.2) Determine the magnitude of the absolute velocity of the flow (?) and the impeller velocity(U) at the inlet and outlet3) Determine the blade angle at the inlet.4) Determine the hydraulic, mechanical and volumetric efficiencies.5) Determine the minimum number of blades required for the slip to not exceed 0.9.6) Determine the static pressure difference (P2-P1) through the impeller by using Bernoulliequation.7) Determine the available NPSH if the pump is placed 2m above the…
- A centrifugal pump pumps water at a flow rate of 7 m³/s to a height of 10 m. If the pump works at the best efficiency point, find the pump impeller diameter, pump speed, the best efficiency value of the pump, the head at the best efficiency value, and the specific speed of the pump, given that CQ=0.15 CH=6 CP=0.75.A pump is designed to deliver 9500 L/min of water at a required head of 8 m. The pump shaft rotates at 1100 rpm. The pump specific speed in nondimensional form is (a) 0.277 (b) 0.515 (c) 1.17 (d ) 1.42 (e) 1.88The Head -flowrate curve for a centrifugal pump is given by: HP = 28 -30Q2 Where, HP is in meter and Q is in m3/s . This pump is used to pump water for a system with the following (H-Q) curve: HS = 8 + 150Q2 Where, HS is in meter and Q is in m3/s . What is the resulting flow rate in the system if three pumps are used in series? (a) 0.56 m^3/s (b) 0.48 m^3/s (c) 0.33 m^3/s (d) 0.36 m^3/s HINT: what is the resulting Flow-rate in the system if three pumps are used in series ? Choose correct option above
- A centrifugal pump has the following characteristics as shown in Table 1. Table 1: Pump characteristics Q(m3 /s) 0.033 0.029 0.027 0.0235 0.020 0.017 0.0133 H(m) 40 60 66 75 80 84 90 Efficiency % 20 45 55 68 75 66 45 The pump is used to pump water from a low reservoir to a high reservoir through a total length of 1100 m of pipe 250 mm in diameter. The difference between the water levels in the reservoirs is 25 m. Neglecting all losses except friction and assuming λ=0.042, calculate: i. The discharge and head at the duty point for the pump. (20) ii. The efficiency at the duty point. (5) [2A turbine is located at an elevation 200 m. below the surface of the water intake. The friction loss in the pipeline leading to it is 8 m and the turbine efficiency is 90%. Compute the input power delivered by the water to the turbine if the flow is 3 m3/s in KW. a.5650.56 b.4576.95 c.192.0A 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.