Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 7, Problem 7.48PP
A fire truck utilizes its engine to drive a pump that is
a. Required exit velocity from the spray tip to reach the required height
b. Resulting flow rate if the spray tip is
c. Power added to the water by the pump if the water is drawn from an open tank at ground level
d. Power required by the pump from the engine given its inefficiency.
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1. As a junior city engineer of a municipality, you are tasked to
design the specifications of the pump with 3650 cu.m/day. The
water source in the municipality is from an open reservoir and
will supply to a pressure tank that will distribute to the
municipality.
open
4l Pressure
reservoir
Tank
70 m
15 m
Pump
Determine the following specifications of the pump and piping
system (assume fluid stagnation at the pump).
Velocity head at pt.1 to 2 if the diameter of the pipe is
a.)
200 mm
b.)
Suction pressure of the pump in kPa (Pressure at pt. 2).
c.)
Velocíty head at pt.3 to 4 if the diameter of the pipe is
150 mm
d.)
Discharge pressure of the pump in kPa (Pressure at pt. 4).
Assume atmospheric pressure at the pump.
If an air vent is installed at the pipe just right before
the pressure tank with diameter of 20 mm, what is the
velocity of discharge in m/s?
The height of the pressure tank is 12 m, what is the
flowrate in cu.m/hr at pt.5 if the diameter of the pipe is
150 mm?
e.)
f.)
2.
A pump draws water from a lake delivered to a height of 50 meters above the lake and encounters 15 meters of headloss. Determine the pump power requirement in Kilo-Watts to deliver a constant supply of 500 Liters per second?
The correct answer has a margin of 1 from exact answer. Velocity head is neglected.
In a hydro-electric power plant, the difference in elevation between the surface of headwater and tail water surface is 182 m. When the flow is 2.25 m 3 /s, the friction loss in the penstock is 18 m and the head utilized by the turbine is 140 m. The mechanical friction in the turbine is 74.6 kW, and the leakage loss is 0.085 m 3 /s. Calculate:
A. Brake powerB. Mechanical efficiencyC. Overall turbine efficiency
Chapter 7 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 7 - A horizontal pipe carries oil with a specific...Ch. 7 - Water at 40 F is flowing downward through the...Ch. 7 - Find the volume flow rate of water exiting from...Ch. 7 - A long DN 150 Schedule 40 steel pipe discharges...Ch. 7 - Figure 7.14 shows a setup to determine the energy...Ch. 7 - A test setup to determine the energy loss as water...Ch. 7 - The setup shown in Fig. 7.16 is being used to...Ch. 7 - A pump is being used to transfer water from an...Ch. 7 - In Problem 7.815 (Fig. 7.17), if the left-hand...Ch. 7 - A commercially available sump pump is capable of...
Ch. 7 - A submersible deep-well pump delivers 745 gal/h of...Ch. 7 - In a pump test the suction pressure at the pump...Ch. 7 - The pump shown in Fig. 7.19 is delivering...Ch. 7 - The pump in Fig. 7.20 delivers water from the...Ch. 7 - Repeat Problem 7.14, but assume that the level of...Ch. 7 - Figure 7.21 shows a pump delivering 840L/min of...Ch. 7 - Figure 7.22 shows a submersible pump being used to...Ch. 7 - Figure 7.23 shows a small pump in an automatic...Ch. 7 - The water being pumped in the system shown in Fig....Ch. 7 - A manufacturer's rating for a gear pump states...Ch. 7 - The specifications for an automobile fuel pump...Ch. 7 - Figure 7.26 shows the arrangement of a circuit for...Ch. 7 - Calculate the power delivered to the hydraulic...Ch. 7 - Water flows through the turbine shown in Fig....Ch. 7 - Calculate the power delivered by the oil to the...Ch. 7 - What hp must the pump shown in Fig. 7.30 deliver...Ch. 7 - If the pump in Problem 7.26 operates with an...Ch. 7 - The system shown in Fig. 7.31 delivers 600 L/min...Ch. 7 - Kerosene (sg = 0.823 ) flows at 0.060m3/s in the...Ch. 7 - Water at 60 F flows from a large reservoir through...Ch. 7 - Figure 7.34 shows a portion of a fire protection...Ch. 7 - For the conditions of Problem 7.31 and if we...Ch. 7 - In Fig. 7.35 kerosene at 25 F is flowing at 500...Ch. 7 - For the system shown in Fig. 7.35 and analyzed in...Ch. 7 - Compute the power removed from the fluid by the...Ch. 7 - Compute the pressure at point 2 at the pump inlet.Ch. 7 - Compute the pressure at point 3 at the pump...Ch. 7 - Compute the pressure at point 4 at the press...Ch. 7 - Compute the pressure at point 5 at the press...Ch. 7 - Evaluate the suitability of the sizes for the...Ch. 7 - The portable, pressurized fuel can shown in Fig....Ch. 7 - Professor Crocker is building a cabin on a...Ch. 7 - If Professor Crocker's pump, described in Problem...Ch. 7 - The test setup in Fig. 7.39 measures the pressure...Ch. 7 - If the fluid motor in Problem 7.44 has an...Ch. 7 - A village with a need for a simple irrigation...Ch. 7 - As a member of a development team for a new jet...Ch. 7 - A fire truck utilizes its engine to drive a pump...Ch. 7 - A home has a sump pump to handle ground water from...Ch. 7 - In Problem 6.107 an initial calculation was made...Ch. 7 - A creek runs through a certain part of a campus...Ch. 7 - A hot tub is to have 40 outlets that are each 8 mm...Ch. 7 - A large chipper/shredder is to be designed for use...
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- A centrifugal pump supplies water at the rate of 750 liter/s against manometric head of 15 m of water. Pump running at 800rpm. Losses in impeller and casing of the pump is given by 0.03V₂2 where V₂ is absolute water velocity at impeller out. Manometric efficiency of the pump is 85%. If the flow velocity is constant at 3 m/s and assumed zero whirl at inlet, determine a) Blade angle at outlet b) Impeller diameter at outlet c) Impeller width at outlet if blade thickness is negligible The pump input power if overall efficiency is 75%. d)arrow_forwardA large container filled with water and uncovered for use in fighting fires in an ethylene production plant. Water from this tank is pumped into the nozzle when needed use. This fire suppression system is designed to be able to transmit 1890 L/min of water at a pressure of 15 bar (relative pressure). If we ignore the difference in height between the water level in the tank and pump, there is no change in diameter of pipe and nozzle, pump efficiency is 70%. Ask how much work (hp) is required to the pump to achieve the desired pressure and flow would like?arrow_forward2) A cylindrical tank of cross-sectional area 25 m2 is continuously fed with water through a feed pipe located at the top of the tank at a volumetric flow rate of 180 m3 /s, and the tank is getting filled up with water at a speed of 7 m/s. If the tank has an open discharge pipe at the bottom, calculate the discharge flow rate through the discharge pipe.?arrow_forward
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