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 7.17PP
Figure 7.22 shows a submersible pump being used to circulate
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Topics: Fundamental of fluid flow
Oil (SG=0.82) entering a pump through an 8-inch diameter pipe at 4 psi has a flow rate of 3.5 cfs. It leaves the pump through a 4-inch diameter pipe at 15 psi. Assuming that the suction and discharge sides of the pump are at the same elevation, find the horsepower delivered to the water by the pump (550 lb.ft/s = 1 HP). Illustrate the problem and show your complete solution.
Example Problem
The fluid being pumped is oil with a specific gravity of 0.86. Calculate the energy delivered by the pump to the
oil per unit weight of oil flowing in the system. Energy losses in the system are caused by check valve and
friction losses as the fluid flows through the piping. The magnitude of such losses has been determined to be
1.86 N.m/N.
Pump system. The volume flow rate through the pump shown in figure below is 0.014 m³/s.
SOLUTION:
+EO
PB = 296 kPa
Schedule 40 (From Pipe Supplier's Table)
Wall
Flow Area
ao
NO
ao
Thickness
DN 50 Schedule 40
(ww)
0.002163
steel pipe
60.3
3.91
52.48
88.9 5.49
77.92
0.004768
08
GENERAL ENERGY EQUATION BETWEEN POINTS A & B:
Flow
PA/y + Z, + v/2g +h- hg -h = PB/y+ ZB + Vp²/2g
1.0 m
%3D
Therefore,
Ty + 87/(A -A) + ("z - "z ) + ^/(°d - d) = 'y
DN 80 Schedule 40
%3D
Check valve
From continuity
equation, v = Q/A,
find VA & VB
VA = ?
steel pipe
PA =-28 kPa
%3D
Vs = ?
Pump
CHECK ANSWER
h =42.9 m, or 42.9 N.m/N
%3D
5.
A piping system is to be installed at place where the pump will transfer the fluid from tank A to tank B. There are two suggested piping designs available to carry the fluid efficiently. Compute and determine which of the available piping arrangement will experience the less pumping powerwith given flow conditions. Discuss the results.
Flow conditions are same for both type of designs and given as: Pipe material: stainless steel Volume flow rate: 40 L/sec Assume the working fluid is water at standard atmosphere temperature and both tanks areopen to atmosphere. Pipe inlet is sharp-edged and bends are sharped without vanes. Elevations are as ?? = ?? ? and ?? = ?? ?
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Saturated water at 310K is being pumped from a tank to an elevated tank at the rate of 7L/s. All of the piping is in 5-in. schedule 40 steel pipe. If the 2 fittings used is 90° ell standard long radius, The pump has an efficiency of 80%. Calculate the kW power needed for the pump.arrow_forwardQ:/ Discuss the relation between the head pressure and flow rate for the benefits of connecting the pumps in parallel ?arrow_forwardFigure 8.12 shows a portion of a fire protection system in which a pump draws water at 60°F from a reservoir and delivers it to a point B at the flow rate of 1500 gal/min.arrow_forward
- A. Neglecting head loss, calculate the velocity of the water as it leaves the pipe. B.Calculate the volume flow rate of the water in m^3/s.arrow_forward1. A pump pumping liquid propellant operates at 10,000 rpm. The volumetric flow rate through the pump is 5,000 gpm. The pressure drop across the pump is 750 psi. Propellant density is 71lbm/ft³. Calculate the head produced by the pump. b. Calculate the pump specific speed. Is this a high-performance pump or a low- performance pump? Calculate the input power to the fluid, i.e. the fluid horse power, fnp. а. С.arrow_forwardReducer connection connecting a pipe that carries water with a diameter of A (mm) and another with a diameter of B (mm). If the pressure difference between the two ends of the joint is equal to C (mm) of mercury, calculate the average velocity at the inlet and outlet sections, and find the volumetric flow rate if the loss is small that can be neglected.arrow_forward
- Problem 3: A submersible deep-well pump delivers 745 gal/ h of water through a 1-in Schedule 40 pipe when operating in the system sketched in the figure below. An energy loss of 10.5 lb-ft/lb occurs in the piping system. (a) Calculate the power delivered by the pump to the water. (b) If the pump draws 1 hp, calculate its efficiency. Air Storage tank 40 psig Vent Well Flow casing 120 ft Well level Pumparrow_forward1. Consider the following schematic of a power plant (operating in what is called a 'Rankine Cycle') Turbine Steam generator Condenser Coling water Economiaer The power plant control room reports that the plant is operating continuously at the following peak load conditions: a. Power to pump = 300KW b. Rate of steam flow = 25 kg/s c. Cooling water temperature at condenser inlet = 13 C d. Cooling water temperature at condenser outlet = 34 C Additionally, the following measurements were made at various points in the piping connecting the power plant components Data Pressure Temp. Quality enthalpy Specific Velocity (kJ/kg) point (kPa) volume (m/s) (m3/kg) (C) (x) 1 6200 2 6100 43 5900 177 ---- 4. 5700 493 ----- 5 5500 482 ----- 6 103 0.94 183 7 96 43 -----arrow_forwardWater in a constant diameter pipe is at 15m on the inlet the pipe leads to the tank situated at a height of 10m, if the total head losses are 8m and the pip inlet and outlet are exposed to the environment and the mass flow remains constant; Chose one of the following: A. no pump is required to ensure water flows to the tank B. none of the above C. a pump needs to ensure water flows to the tank D. the water will flow through gravity to the tankarrow_forward
- Saturated water at 310K is being pumped from a tank to an elevated tank at the rate of 7L/s. All of the piping is in 5-in. schedule 40 steel pipe. If the 2 fittings used is 90° ell standard long radius, The pump has an efficiency of 80%. Calculate the kW power needed for the pump. Calculate the total friction losses in kJ/kg.arrow_forwardFind the loss in total pressure for each run in the simple duct system of Fig. 1, using the equal-friction method and in English unit. The total pressure available for the duct system is 0.12 in. wg (30 Pa), and the loss in total pressure for each diffuser at the specified flow rate is 0.02 in. wg (5 Pa). Duct fittings are listed in Table 1. Assume the duct dimeter in run 1 is 10 in. and the rest are 8 in. Does the duct system require any adjustment? 150 cfm e. a 15 ft Plenum е 15 ft 5 ft 5 ft a 3. 20 ft 4 10 ft 200 cfm e 10 ft 150 cfm b Duct Fittings for Figure 1 Fittings Type Abrupt Entrance 90 deg Elbow, Pleated Round to Rectangular boot, Straight 45 deg. Converging Wye 45 deg Elbow, Pleated a d earrow_forwardThe two-lobe rotary pump moves 0.145 gal of a coal slurry in each lobe volume Vlobe. Calculate the volume flow rate of the slurry (in gpm) for the case where n. = 220 rpm.arrow_forward
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