A centrifugal pump lifts water against of 0.08 m, major losses in the suction side h,, = EN m and in the discharge side hin is 3 m. The pump impeller has a diameter of 0.15 m, exit width of0.015 m, exit blade angle of 22° and speed ofN= 20EN rpm The hydraulic efficiency is 0.85. If the flow at the entrance is radial, find the discharge, pump head, atmospheric pressure Pa. vapor pressure P, and maximum allowable height of the pump from the feeding tank water surface elevation if the pump is operating under T= 25 °C at altitude H= 20EN m. static !! o, = NPSH, H, =1.21x10*N !! $256 Ply =10.33(1-2.256×10H

A centrifugal pump lifts water against of 0.08 m, major losses in the suction side h,, = EN m and in the discharge side hin is 3 m. The pump impeller has a diameter of 0.15 m, exit width of0.015 m, exit blade angle of 22° and speed ofN= 20EN rpm The hydraulic efficiency is 0.85. If the flow at the entrance is radial, find the discharge, pump head, atmospheric pressure Pa. vapor pressure P, and maximum allowable height of the pump from the feeding tank water surface elevation if the pump is operating under T= 25 °C at altitude H= 20EN m. static !! o, = NPSH, H, =1.21x10*N !! $256 Ply =10.33(1-2.256×10H

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter7: Seepage

Section: Chapter Questions

Problem 7.1P

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Water at 20°C ( ρ= 999.7 kg/m3 and μ=9.7720 x10-4 kg/m · s) is flowing steadily in a hexagonal cross sectional pipe b=1.5cm, 20-m-long at an average velocity of 1.2 m/s. Determine: (a) Hydraulic diameter. (b) The pressure drop. (c) The head loss. (d) The pumping power requirement to overcome this pressure drop.
A centrifugal pump which runs at 104.3 rad ·s−1 (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. For a flow rate of Q (m3 ·s−1) the friction loss in the suction pipe is 68Q2 m and that in the delivery pipe is 650Q2 m. The impeller of the pump is 350 mm diameter and the width of the blade passages at outlet is 18 mm. 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 other losses in the pump, the velocity heads in the suction and delivery pipes, and whirl slip are all negligible, calculate the rate of flow in liter/s and the manometric efficiency of the pump.
1.1) A pump draws water from an open reservoir, with a static suction head of 26.24 feet, and lifts it to another open reservoir with a static discharge head of 25 meters. The diameter of the suction pipe is 15.24 cm and the diameter of discharge pipe is 4.0 inches. The total head loss from A to B is 25 % of the total dynamic head (TDH), and the head loss at the discharge side of the pump is 90 % of the total head loss. The pump capacity is 50 lps. Determine: a) the pump brake power if the efficiency is 82 % b) the reading of the pressure gauge installed at the suction side of the pump c) the reading of the pressure gauge installed at the discharge side of the pump.
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Water at 15°C (? = 999.1 kg/m3 and ? = 1.138 × 10−3 kg/m·s) is flowing steadily in a 30-m-long and 6-cm-diameter horizontal pipe made of stainless steel at a rate of 10 L/s. Determine (a) the pressure drop, (b) the head loss, and (c) the pumping power requirement to overcome this pressure drop.
1] A pump draws water from an open reservoir, with a static suction headof 26.24 feet, and lifts it to another open reservoir with a static discharge head of25 meters. The diameter of the suction pipe is 15.24 cm and the diameter ofdischarge pipe is 4.0 inches. The total head loss from A to B is 25 % of the totaldynamic head (TDH), and the head loss at the discharge side of the pump is 90 %of the total head loss. The pump capacity is 50 lps. Determine: a) the pump brakepower if the efficiency is 82 %; b) the reading of the pressure gauge installed atthe suction side of the pump; and c) the reading of the pressure gauge installed atthe discharge side of the pump.
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Water is pumped from reservoir A through 1850 m pipeline 600 mm across a valley to a second reservoir C. the water surface elevation of reservoir A is at elevation 61 m and that of C is at elevation 91m. If during pumping, the pressure at B which is located midway of the 600 mm pipe and at elevation 30 is 100 kPa. Compute the flow rate and the horsepower exerted by the pump if f = 0.02.
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