I need the answer quickly Problem 4.26 Two geometrically similar pumps are running at the same speed of 1440rpm. One pump has an impeller diameter 40cm and delivers water at rate 20 litres persecond against head of 20 m. Calculate the impeller diameter and head of other pumpto deliverthe discharge of first pump.

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Answered: Problem 4.26 Two geometrically similar…

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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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
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 and a speed of 1800 rpm. A pump is to be made up with a number of stages in series. In similar construction to that the first pump to run at 1250 rpm and to deliver 15 kiloliters/min against a total head of 250m. find the diameter of the impellers and the number of stages required in this case.
A centrifugal pump with a 3-inches diameter impeller rotating at 1150 rpm delivered 400 gpm of water 80ºF at 250 ft total head. Find the impeller diameter of a geometrically similar pump rotating at 1750 rpm delivering 500 gpm. What is the total head of the second pump.
For a centrifugal pump of impeller diameter D rotating at N to develop a head of H and discharge Q, what would be the new head developed by a similar pump if we double the impeller diameter to 2D at constant impeller speed?
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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.
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 24cm and a speed of 1800rpm. 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 1250rpm and to deliver 15 kiloliter/min against a total head of 250m. Find the diameter of the impellers and the number of stages required in this case. The most common condition is that of pumping water from a sump, as illustrated diagrammatically in figure below. Data: Water temperature 90°F., sea level, friction and turbulence loss in the suction line 1 ft., suction lift 8 ft. What is the available suction head? The vapor pressure corresponding to 90°F is 0.698lb. per sq. in. abs. and the specific gravity is 0.997. per sq. in. abs. and the specific gravity is 0.996.
A centrifugal pump having an impeller of diameter 500 mm delivers 140 litres of water per sccond. The velocity of flow is 1 m/s and the vanes are curved back at outlet at 30° to the wheel tangent. If the impeller speed is 400 r.p.m., find the power to drive the pump. (Ans. 12-9 kW) 3.
A centrifugal pump running at 3500 rpm pumps water at a rate of 0.01cu. m./sec. The water enters axially, and leaves the impeller at 5m/s relative to the blades, which are radial at the exit. If the pump requires 5kW, and is 67% efficient, estimate the basic dimensions (impeller exit diameter and width).
Q2/ An outward flow reaction turbine has tangential velocity at its inner rim as 20 m/s, and ratio of radii is 0.9. The turbine is placed 1 m below the water surface and blade angle are 90° and 20° at inlet and outlet respectively. The radial velocity of flow at inlet is 6 m/s. Neglecting frictional losses and taking the discharge as radial, draw velocity triangles at inlet and outlet and find: (a) guide vane angle (b) the velocity of water from the guides. (c) total head of water (d) hydraulic efficiency
5.9 Diffuser vanes are sometimes used in centrifugal pumps to increase the static pressure at discharge. A few such vanes are shown in the following figure. If the flow rate is 0.1 m³/s and the height of blades is 2 cm, find the increase in static pressure. The inside and outside radii are 15 cm and 21 cm, respectively. 104 Turbomachinery: Concepts, Applications, and Design 14° 27°

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Problem 4.26 Two geometrically similar pumps are running at the same speed of 1440 rpm. One pump has an inpeller diameter 40cm and delivers water at rate 20 litres per second against head of 20 m. Calculate the impeller diameter and head of other pump to deliver the discharge of first pump.