Parallel-connected four centrifugal pumps each have a specific speed of 28 and operate at 1400 rpm while delivering water with outlet velocity of flow of 3 m/s. The impeller outer diameter and blade angle at outlet are 0.23 m and 26 to the tangent respectively. The for pumps are replaced by series-connected double centrifugal pumps to meet the same duly (same head and flow rate) with a specific speed of 31 for each pump. The outer diameter of the impeller is 0.5 m and passage width is 0.04 m. At exit, the blades are backward curved and making an angle of 15 with tangent. Determine the manometric efficiency of each pump for the in series-connected pump system?

Parallel-connected four centrifugal pumps each have a specific speed of 28 and operate at 1400 rpm while delivering water with outlet velocity of flow of 3 m/s. The impeller outer diameter and blade angle at outlet are 0.23 m and 26 to the tangent respectively. The for pumps are replaced by series-connected double centrifugal pumps to meet the same duly (same head and flow rate) with a specific speed of 31 for each pump. The outer diameter of the impeller is 0.5 m and passage width is 0.04 m. At exit, the blades are backward curved and making an angle of 15 with tangent. Determine the manometric efficiency of each pump for the in series-connected pump system?

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

See similar textbooks

Similar questions

Paralel-connected double centrifugal pumps each have a specific speed of 28 and operate at 1350 rpm while delivering water with outlet velocity of flow of 3 mv's and ‘performing 82% manometric cfficicacy. The impeller outer diameter and blade angle at outlet are 0.25 m and 25 to the tangent respectively. The double pumps are replaced by series-connected four centifugal pumps 1o meet the same duty (same head and flow rate) with a specific speed of 30 for each pump. The outer diameter of the impeller s 0.5 m and passage width is 0.03 m. At exit the blades are backward curved and making an angle of 14° with tangent. Draw the velocity diagrams at nlet and outlet. Determine the manometric efficiency of each pump for the in series- connected pump system?
It is proposed to build a three- stage centrifugal pump to deliver 4000 kg/min of water at a speed of 900 rpm under a total manometric head of 70 m. The vanes are to be radial at inlet and are to be curved backwards at exit at an angle of 45°. Assuming manometric efficiency of 84% and overall efficiency of 75% and considering that vane thickness accounts for 8% of circumferential area. The velocity of flow may be assumed constant at 2.5 m/sec. The probable external diameter is ؟
It is proposed to build a three- stage centrifugal pump to deliver 4000 kg/min of water at a speed of 900 rpm under a total manometric head of 70 m. The vanes are to be radial at inlet and are to be curved backwards at exit at an angle of 45°. Assuming manometric efficiency of 84% and overall efficiency of 75% and considering that vane thickness accounts for 8% of circumferential area. The velocity of flow may be assumed constant at 2.5 m/sec. The outlet peripheral speed is ؟
It is proposed to build a three- stage centrifugal pump to deliver 4000 kg/min of water at a speed of 900 rpm under a total manometric head of 70 m. The vanes are to be radial at inlet and are to be curved backwards at exit at an angle of 45°. Assuming manometric efficiency of 84% and overall efficiency of 75% and considering that vane thickness accounts for 8% of circumferential area. The velocity of flow may be assumed constant at 2.5 m/sec. The width of each impeller is ؟
A two stage centrifugal pump is designed to discharge water at a total head of 70 m with an overallefficiency of 0.76. The pump runs at 2331.6 rpm. The actual head developed (per stage) is 65% ofthe theoretical head. The flow at the inlet is pure radial. The impeller at the exit has a diameter of D2=0.219m and a width b2=0.0216m .The outlet blade angle is ?= 28°. Determine:1. The flow rate of the pump.2. The output power of the two stage centrifugal pump. Take ρ= 1000kg/m^3g=9.81 m^2/s
A centrifugal pump outer diameter equal to two times the inner diameter and running at 1200 rpm works against a total head of 75 m the velocity of the flow through the impeller is constant and equal to 3 m/s. The vane are set back at an angle of 30° at outlet. If the outer diameter of the impeller is 600 mm and width at out let is 50 mm, determine; 1- Vane angle at inlet. 2- Work done per second by imepller.
The outer diameter of an impeller of a centrifugal pump is 300mm and outlet width is 50mm. The pump is running at 800 rpm and is working against a total head of 20 m. The vanes angle at outlet is 40 deg and manometric efficiency is 75%. Determine: (a) velocity of flow at outlet; (b) velocity of water leaving the vane; (c) angle made by the absolute velocity at outlet with the direction of motion at outlet; and discharge.
A centrifugal pump discharge 7500 L of water per minute against a total head of 25 m when running at 660 rpm. The outlet diameter of the impeller is 600 mm and the ratio of outer to inner diameter is 2. The area of flow through the wheel is 0.06 m^2. The vanes are set back at an angle of 45 degrees. Water enters the wheel radially and without shock. Calculate (i) manometric efficiency and (ii) vane angle at the inlet.
The impeller of the centrifugal pump is 350 mm diameter, and the width of the blade passages at outlet is 18 mm. A pump, which runs at 16.6 rev/s, is mounted so that its centre is 2.4 m above the water level in the suction sump. It delivers water to a point 19 m above its centre; the friction loss in the suction pipe is 68 Q² meter and that in the delivery pipe is 650 Q² meter where Q in m3/s is the rate of flow. The blades themselves occupy 5% of the circumference and are backward facing at 35° to the tangent. At inlet, the flow is radial and the radial component of velocity remains unchanged through the impeller. Assuming that 50% of the velocity head of the water leaving the impeller is converted to pressure head in the volute, and that friction and shock losses in the pump, the velocity heads in the suction and delivery pipes are negligible, calculate the following:The flow rate, m3/s, of the pump. Manometric efficiency, in %, of the pump.
The impeller of the centrifugal pump is 350 mm diameter, and the width of the blade passages at outlet is 18 mm. A pump, which runs at 16.6 rev/s, is mounted so that its centre is 2.4 m above the water level in the suction sump. It delivers water to a point 19 m above its centre; the friction loss in the suction pipe is 68 Q² meter and that in the delivery pipe is 650 Q² meter where Q in m3/s is the rate of flow. The blades themselves occupy 5% of the circumference and are backward facing at 35° to the tangent. At inlet, the flow is radial and the radial component of velocity remains unchanged through the impeller. Assuming that 50% of the velocity head of the water leaving the impeller is converted to pressure head in the volute, and that friction and shock losses in the pump, the velocity heads in the suction and delivery pipes are negligible, calculate the following: The flow rate, m3/s, of the pump. Manometric efficiency, in %, of the pump.
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 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…