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 7.43PP
If Professor Crocker's pump, described in Problem 7.42, has an efficiency of
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What is the power ratio of a pump to its 1/5 scale model if the ratio of the heads is 4 to 1?
A centrifugal pump equipped with a variable frequency (speed) drive running at 3300 rpm is discharging 250 gallons per minute corresponding with a head of 235 feet. The horsepower is 34.2. If the pump’s speed is reduced to 2700 rpm, what will be the revised flow rate, head, and power required?
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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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- 1.calculate the pressure in a hydraulic system if the pump delivers 180 liters /min, and the engine has a power capacity of 75kw.2.The engine has a given capacity of 60kw, calculate the power requirement in a hydraulic system tool , to know that the engine is capable to support the hydraulic system if a pump delivers 110 liters per minute and the pressure is 227bar.arrow_forward2.14. A pump is driven by a two-speed motor having speeds of 1750 and 1185 rpm. At 1750 rpm, the flow is 45 gpm, the head is 90 ft, and the total efficiency is 0.60. The pump impeller has a diameter of 10 in. a. What values of Q, H, and ns are obtained if the pump runs at 1185 rpm? b. Find the specific speed and the specific diameter of the pump (at 1750 rpm).arrow_forwardYou and your workmate are choosing pumps for your design. You've already decided which centrifugal pump you will use. The next thing you would think about this time would be the shape of it's impeller blades. The impeller in your design would have a revolution of 565 rpm, will have a volume flow rate of 11.7 gals per min and will (discharge) head of 2222 cm. Your coworker said that axial flow pump is your choice. Would you agree? Why or why not? Prove it.arrow_forward
- A pump has a displacement volume of 6 in^3. It delivers 24 gpm at 1000 rpm and 1000 psi. If the prime mover input torque is 1100 in • lb, what is the theoretical torque required to operate the pump in in-lbs?arrow_forwardA gear pump has a 75-mm outside diameter, a 55-mm inside diameter, and a 30-mm width. If the actual pump flow rate at 2700 rpm and rated pressure is 0.0025 m³/s. What is the volumetric efficiency?arrow_forwardA fuel pump is delivering 60 gal/min of oil with a specific gravity of 0.75. The total head is 45 meters. Find the motor that is capable of handling this pump. Assume the pump efficiency of 72 % and motor efficiency of 80 %arrow_forward
- Use the Goulds Pump Selection System to find a pump capable of delivering at least 500 gpm against an elevation gain of 120 ft. Use 150 ft as the pump head to be safe.arrow_forwardA centrifugal pump delivers 2.5 cfs of water against a head of 25 ft at 1500 rpm and requires 10 hp. If the speed is reduced to 1250 rpm calculate the flow (in m^3/s), assuming the same efficiency.arrow_forward1. A piston positive- displacement pump has a 6-in. diameter and a 2.5-in. stroke. Its crankshafts rotates a 300 rpm. (a) calculate its output at 100%volumetric efficiency in gpm. (b) If the pump delivers water against a total head of 24 ft, what horsepower is required at 72% efficiency?arrow_forward
- For Questions 3 to 5, consider the following conditions: a centrifugal pump has diameters d1 = 7 in, d2 = 13 in, blade widths b1 = 4 in, b2 = 3 in, blade angles B1 = 25° and B2 = 40°, and rotates at 1160 r/min. If the fluid is gasoline at 20°C (p = 1.319 slugs/ft^3) and the flow enters the blades radially, estimate the theoretical or "design" quantities.arrow_forward2/3 Summarize the rotor theory of centrifugal pumps, focusing on the following topics: Action of the rotor blades on the liquid Velocity equationarrow_forwardA 5-inch diameter centrifugal pump operating at 1000 RPM is geometrically similar to another 7.5 inch diameter pump when operating at 1400 RPM. The working fluid is water for both cases. Calculate the flow rate, head and brake power for the smaller pump if the flow rate, head and brake power for the largest diameter pump is 1000 gal/min, 50 ft and 15 hp respectively considering the point of operation previously described.arrow_forward
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