The following figure shows a pump that extracts water from a reservoir with a volumetric discharge rate of Q L/s. Assume all losses are negligible. a) What would be the pressure at points A and B, when the pump-motor system extracts P kW from the electric grid. The combined efficiency of the pump-motor system is 60%. b) Draw the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) for this system. Q = 0.055 L/s; P = 20 kW B 1.2 m Atmosphere 3.0 m Diameter: 10 cm A Pump Diameter: 15 cm

The following figure shows a pump that extracts water from a reservoir with a volumetric discharge rate of Q L/s. Assume all losses are negligible. a) What would be the pressure at points A and B, when the pump-motor system extracts P kW from the electric grid. The combined efficiency of the pump-motor system is 60%. b) Draw the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) for this system. Q = 0.055 L/s; P = 20 kW B 1.2 m Atmosphere 3.0 m Diameter: 10 cm A Pump Diameter: 15 cm

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

The following figure shows a pump that extracts water from a reservoir with a volumetric
discharge rate of Q L/s. Assume all losses are negligible.
a) What would be the pressure at points A and B, when the pump-motor system extracts
P kW from the electric grid. The combined efficiency of the pump-motor system is
60%.
b) Draw the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) for this
system.
Q = 0.055 L/s; P= 20 kW
B
1.2 m
Atmosphere
C
3.0 m
Diameter: 10 cm
Pump
Diameter: 15 cm

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3. A pump draws water at 300 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is 20 times the velocity head in the 200 mm diameter and the head loss from 2 to B is 20 times the velocity head in the 150-mm diameter pipe. Assume your own reservoir B elevation then compute for the energy that must be supplied to the pump in kW if said appurtenance has an efficiency of 80%. Compute also the pressure at points 1 and 2. Reservoir A 200 mm pipe Pump 150 mm Reservoir B
3. A pump draws water at 300 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is 20 times the velocity head in the 200 mm diameter and the head loss from 2 to B is 20 times the velocity head in the 150-mm diameter pipe. Assume your own reservoir B elevation then compute for the energy that must be supplied to the pump in kW if said appurtenance has an efficiency of 80%. Compute also the pressure at points 1 and 2. Reservoir A 200 mm pipe Elevation=-20 m Point 1 Point 2 Pump 150 mm A Reservoir B
6. A centrifugal pump discharging 900 gpm and operates at 1800 rpm against a head of 120 feet has a power output of 30 hp. If the pump is to operate at 1200 rpm assuming efficiency remains constant. Determine the new discharge in gpm, the head and power.
A hydraulic pump having volume displacement rate is 10×10-5 m 3 /rev. The flow rate deliver by the pump is 1.5×10-3m 3 /s at 1000 rpm speed and 5 MPa pressure. If the input torque on the prime mover is 100 N.m. Find the overall efficiency of the pump and the theoretical torque require to operate the pump. Consider atmospheric pressure is 1×105 Pa.
The pump draws water at 30 liters per second from reservoir A and lifts it to reservoir B as shown. The head loss from A to 1 is three times the velocity head in the 150mm diameter pipe and the head loss from 2 to B is twenty times the velocity head in the 100mm diameter pipe. Which of the following most nearly gives the powet delivered by the pump? Choices: 59.38 kW 75.14 kW 44.82 kW 53.96 kW
9.The pump shown delivers 115 li/s of oil, sg = 0.84, toreservoir D at elevation 72 m. The energy lost in thesuction line is 3.2 J/N and in the discharge line is 7.6 J/N. a.Compute the total head added by the pump. b.How many kW does the pump supply the system? c.If the pump is 85% efficient, how much power does it need?
- Water is flowing at a critical depth of flow = 1.4 m in a channel shown in the figure below. Estimate the discharge and specific energy in the channel. 몰 0.5 1 2.4 m- 1.4 m
A pump with an 8-in diameter impeller is operating at 1750 rpm and delivering 40 gpm with a total dynamic head of 55 ft. The pump's brake horsepower (BHP) is 1.2 hp under these conditions. Assume constant efficiency. Show your solutions a. Approximate the pump's capacity if impeller size is increased to 10 in. b. Approximate the pump's capacity if pump speed is increased to 3450 rpm. c. Approximate the pump's total dynamic head if impeller size is increased to 10 in. d. Approximate the pump's total dynamic if pump speed is increased to 3450 rpm. e. Approximate BHP if impeller size is increased to 10 in. f. Approximate BHP if pump speed is increased to 3450 rpm.
What is the required pump power (Pa) for the system below? The source reservoir is on the right side of the figure The outflow is released as a water jet to the atmosphere (on the left) Discharge rate is 0.11 m3/s Pipe total length is 180 m Pipe diameter is 0.2 m Friction factor (f) is 0.01 Minor losses are negligibleCHOOSE ONE: 25 KiloWatt 169 KiloWatt 269 KiloWatt 112 KiloWatt
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