(B) Two similar centrifugal pumps are connected in series. The theoretical head- discharge relation of Pump#1 is given by: h, = 5.3 – 0.58Q and that of Pump#2 is given by: h2 = 7.7 + 0.22Q. At a specific operation conditions, the head of these combined pumps is 12 m. Estimate the followings: (i) The head of each pump (ii) If the flow out of this system is completely blocked while the two pumps still running, what is the resulting total head of the system? (iii) If the two pumps rotates with same speed, how many pump#2 is bigger than pump#1?

(B) Two similar centrifugal pumps are connected in series. The theoretical head- discharge relation of Pump#1 is given by: h, = 5.3 – 0.58Q and that of Pump#2 is given by: h2 = 7.7 + 0.22Q. At a specific operation conditions, the head of these combined pumps is 12 m. Estimate the followings: (i) The head of each pump (ii) If the flow out of this system is completely blocked while the two pumps still running, what is the resulting total head of the system? (iii) If the two pumps rotates with same speed, how many pump#2 is bigger than pump#1?

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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B-A pump has the following parameters N=2133.5 RPM, Ns = 40 RPM, D= 37.1 cm and is used to pump water up to 90 m(H) at maximum efficiency operation: write the answer only (a) At what speed should the pump be operated to pump water up to (76 m)? (b) What is the discharge in each case? (c) What is pumping power needed in each case? (d) What is consumed electrical power in each case if max = 90%? e- A pump discharges liquid at the rate of Q against a head of H. If specific weight of the liquid is w, find the expression for the pumping power.
A centrifugal pump is used to pump a liquid with the properties given below. Liquid is pumped from a storage tank at 95 kPa (a) to a discharge tank at 300 kPa (a). The system configuration is given in the table below. Table 1: system configuration Suction Discharge 4 50 Length (m) Diameter (m) 0.07 0.055 12 90° bends (L/D-35) 5 T piece (L/D=7) Gate valve (L/D-35) 1 1 1 2 Static height (m) 25 Liquid density = 1100 kg.m³ Viscosity = 1.5 x 10-³ Pa.s Vapour pressure of the liquid = 25 kPa (a) Material of construction of pipe is commercial steel, ε = 000045 m Table 2: Pump data 0 10 20 30 40 Flowrate (m³.hr¹) Head (m) 55 56 51 36 6 NPSH (m) 0 2 6 11 19 22 3.1. Graphically determine the optimal operating point of the pump in the above system using the pump data in Table 2. 3.2. Determine the NPSH of the system and determine whether the pump will cavitate when used in the above system.
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 40 35 30 25 Qs, m³/h 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 20 25 30 35 Qs, m³/h 0 244 372 470
Given: Two (2) identical pumps connected in parallel has the following data: Suction Pressure = 315 KPA Discharge Pressure = 220mmHg Suction Pipe Dia = 390mm Discharge pipe Dia = 405mm Velocity of Water = 6.0 m/s Solve: Total Head, Pump1 & 2 individual head and if Pump 2 is 9.5% less than Pump 1 and Q₁ = Total Flow Rate
A centrifugal pump rotates at n. = 750 rpm. Water enters the impeller normal to the blades (?1 = 0°) and exits at an angle of 35° from radial (?2 = 35°). The inlet radius is r1 = 12.0 cm, at which the blade width b1 = 18.0 cm. The outlet radius is r2 = 24.0 cm, at which the blade width b2 = 16.2 cm. The volume flow rate is 0.573 m3 /s. Assuming 100 percent efficiency, calculate the net head produced by this pump in cm of water column height. Also calculate the required brake horsepower in W
Given: Two (2) identical pumps connected in parallel has the following data: Suction Pressure =220mmHg Discharge Pressure = 315 KPA Suction Pipe Dia = 390mm Discharge pipe Dia = 405mm Velocity of Water = 6.0 m/s Solve: Total Head, Pump1 & 2 individual head and if Pump 2 is 9.5% less than Pump 1 and QT = Total Flow Rate
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Given: Two(2) identical pumps series in connection Suction Pressure = 3.2 Bars Discharge Pressure = 4.95 Bars Suction Pipe Dia = 450mm Discharge pipe Dia = 480mm Velocity of Water = 4.25 m/s Solve: Total Head, Pump1 & 2 individual head and if Pump 2 is 9.5% less than Pump 1 and Or = Total Flow Rate
A centrifugal pump having four stages in parallel delivers 12 kiloLiters per minute of liquid against a head of 25m. The diameter of the impeller being 24 cm has a speed of 1800 rpm. A pump is to be made up with a number of stages in series. In similar construction to that of the first pump to run at 1250 rpm and to deliver 15 kiloLiters/min against a total head of 250 m, find the number of stages required in this case. Select the correct response: 2. 4) 3.
1Two water pumps are arranged in series. The performance data for both pumps follow the parabolic curve fit Havailable =H0 =aV ^2. For pump 1, H0 =5.30 m and coefficient a =0.0438 m/Lpm^2; for pump 2, H0 =8.70 m and coefficient a =0.0347 m/Lpm^2. In either case, the units ofnet pump head H are m, and the units of capacity V are Lpm.Calculate the combined shutoff head. Complete Answer, thank you
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
Pumps: A centrifugal pump having 4 stages in parallel, delivers 18 kiloliters/min of liquid against a head of 25 m. The diameter of the impellers being 24 cm and the speed of 1800 rpm. A pump is to be made up with a number of stages in series of similar construction to that of the first pump to run at 1250 rpm and to deliver 15 kiloliters/min against a totalhead of 250 m. Find the diameter of the impellers and the number of stages required in this case. Answer: D = 46.63 cm, n = 6 stages