Exmp3-Two centrifugal pumps have the head and discharge characteristics as follows: Discharge Q litres/second 8 12 16 20 24 PUMP 1 Head Hm, (metres) 50.0 51.8 50.8 48.0 42.5 32.5 18.3 PUMP2 46.7 45.9 44.2 40.3 34.3 26.0 17.0 Head Hm, (metres) m2 Both pumps are installed together and are required to pump water through a pipe 150 mm diameter having f = 0.02. Calculate the heads %3D under which pumps are working and discharge in liters per second pumped by them if:

Exmp3-Two centrifugal pumps have the head and discharge characteristics as follows: Discharge Q litres/second 8 12 16 20 24 PUMP 1 Head Hm, (metres) 50.0 51.8 50.8 48.0 42.5 32.5 18.3 PUMP2 46.7 45.9 44.2 40.3 34.3 26.0 17.0 Head Hm, (metres) m2 Both pumps are installed together and are required to pump water through a pipe 150 mm diameter having f = 0.02. Calculate the heads %3D under which pumps are working and discharge in liters per second pumped by them if:

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The efficiency at the best operating point is: Head (ft) O-4% O 23% O 28% 5% 85.00 80.00 75.00 70.00 65.00 60.00 55.00 50.00 45.00 40.00 35.00 30.00 25.00 20.00 15.00 10.00 Pump Curve System Curve Effe. Poly. (Pump Curve Poly. (System Curve) Operating Point Chart 20 30 40 Q (gpm) 50 60 70 35% 30% 25% 20% 15% 10% 5% 0% -5% -10% -15% -20% -25%
An aqueduct is required to supply water to the community.Data: Families = 12 Average members per family = 3 people Breakfast, lunch and dinner = 15 total liters / family Showers = 10lt / person, one daily shower Kitchen wash = 13lts / day Total distance of the pipeline to the storage tank = 1200 meters Total height H from the pump point to delivery to the tank = 70 meters Determine: Estimation of the total volume of the recommended tank, an autonomy of at leas 2 days of storage. It is required to propose a pump that allows at least filling the tank between 5 to 12 hours operation, it must include details of the pump, as well as its curve Image: schematic detail of the proposed system
P (6-5) Two centrifugal pumps are connected in parallel in a given pumping system. Plot total head Ah against capacity Q pump and system curves for both pumps running on the basis of the following data: Operating data for pump 1 Operating data for pump 2 Ahm, 40.0 35.0 30.0 25.0 Ah m. 0.0 35 30 25 Qim³/h. 169 209 239 265 Q₂m/h 0 136 203 267 data for system Ah m, 20.0 25.0 30.0 35.0 Q.m³/h, 0 244 372 470
Example 1: A system has a volume flow rate requirement of 1lit/s with an index run AP of 30kPa. Find an appropriate pump from the A manufacturer's catalogue gives the following information for a centrifugal pump operating at 12rev/s: P| 49.38 47.5| 44.38 40 34.38 27.5 19.38 Q|0.25 0.5 0.75 1.25 1.5 1.75 yelume flow rate
For the following pump-pipe system below, how will the discharge and pump head change if a smaller pump in the same family is used to replace the current pump? Increase or decrease? EB EA Head (ft) 350 300 250 225 200 150 100 50 0 0 5 10 O Pump head will decrease; discharge will decrease. O Pump head will increase; discharge will increase. O Pump head will increase; discharge will increase. O Pump head will decrease; discharge will increase. 15 20 Discharge (cfs) System head curve 25 H₂ -Intersection point Pump characteristics 30 35 40
Head, m Consider the plot below, what is the operating flow rate of the pump in this ?system 25 20 15 10 5 0 0.01 0.015 1 0.02 0.025 Q, m³/sec 0.03 - -H-Q curve 0.035 0.04 0.02 m3/s O 0.026 m3/s O 0.32 m3/s O 0.035 m3/s O
Example: Two centrifugal pumps are connected in parallel in a given pumping system. Plot total head Ah against capacity Q pump and system curves for both pumps running on the basis of the following data operating data for pump 1 Ah, m Qs, m³/h 40 35 30 25 169 209 239 265 operating data for pump 2 Ah, m 40 35 30 25 Qs, m³/h 0 136 203 267 Data for system Ah, m 20 Qs, m³/h 0 22 25 30 35 244 372 470
Q1. Two pumps with 105.4 cm in diameters characteristics shown in figure below are used in paralel to pump water to the system. Neglecting local losses, calculate total flow rate and pump power. (a) n= 710 d/dak 120 7.5 80m ENPY (2) 6. 105 - 105.4 cm çap S N 4.5 3 90 96.52 cm çap 88% 86% 75 - 88.9 cm çap S4% (1) bom 60 1100 kW 45 750 kW 30 0.25 0.50 0.75 1.00 1.25 1.50 1.75 Debi m/s Note: Pipe is cast iron with 0.6 m in diamater and 1.6 km in length. Fluid is water with density 1000 kg/m³ . ENPY m %68 900 kW
3) Given: Q = 14 lit/sec; For the suction pipe: %3D diam. = 180mm with head loss = three times its %3D %3D velocity head; For the discharge pie: diam. = 142mm with head loss of twenty times its velocity head; pump elev. = 55m. Req'd: a) horsepower input of the pump if Efficiency = 88% %3D b) pressure at the discharge side of the pump. EL 109 m EL. 55 m EL 54 m RIVER
4) Compare the graphs for pumps in series and pumps in parallel, and describe the similarities and differences. Total Head (m) 16 14 12 10 00 10 4 2 0 Comparison of Series and Parallel Pumps 0.5 1 1.5 Discharge, Q (L/s) Pumps in Series Pumps in Parallel 2.5 3
The performance data of a water pump follow the curve fit Havailable = H0 = aV^2, where the pump’s shut off head H0=5.30 m, coefficient a =0.0453 m/(Lpm)^2, the units of pump head H are meters, and the units of V. are liters per minute (Lpm). The pump is used to pump water from one large reservoir to another large reservoir at a higher elevation. The free surfaces of both reservoirs are exposed to atmospheric pressure. The system curve simplifies to Hrequired =(z2- z1) + bV ^2, where elevation difference z2 =-z1 = 3.52 m,and coefficient b =0.0261 m(Lpm)^2. Calculate the operating point of the pump.
7) A pump has the following characteristic: Volume flow rate 23 46 69 92 115 (m³/h) Head (m) 17 16 13.5 10.5 6.6 The is used to pump water from a lower tank to a higher tank through a total length of pump 800 m of 150 mm diameter pipe. The difference between the water levels in the two tanks is 8m. Neglecting all losses except friction and assuming that C; = 0.004, find the rate of flow between the two reservoirs. [Ans: = 60m/hr]