Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780133494839
Author: Mott
Publisher: PEARSON
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Chapter 13, Problem 13.58PP
Determine the NPSH available when a pump draws gasoline at
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Assume that friction in the suction line is negligible. Toluene @ 35C is pumped from an open reservoir to a tank kept at a gauge pressure of 150 kPa. The pump itself is 3 m below the reservoir, while the discharge tank is 10m above the reservoir. While in the discharge line the friction head amounts to 7.5 m, determine the net positive suction head available for the pump. If the pump has an efficiency of 65%, determine the total power input. At the given temp, the density and vapor pressure of toluene are 862 kg/m3 and 40 mmHg.
Electric power is generated in the hydroelectric power plant with a turbine-generator system, which has a water input of 45 m3 per second from a height of 53 meters and operates with 73% efficiency. Calculate the electrical power generated in the plant since the friction loss in the pipes is neglected.
A) 1,7 MW
B) 17 MW
C) 32 MW
D) 171 MW
E) 23 MW
A small centrifugal pump is used to deliver 0.005 m3/s of water to level 2 as shown in Fig. 2. Neglecting the losses, determine the required power input to the pump if its efficiency is equal to 70%.
Chapter 13 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 13 - List 12 Factors that should be considered when...Ch. 13 - List items that must be specified for pumpsCh. 13 - Describe a positive-displacement pump.Ch. 13 - Name four examples of rotary positive-displacement...Ch. 13 - Name three types of reciprocating...Ch. 13 - Describe a kinetic pumpCh. 13 - Name three classifications of kinetic pumps.Ch. 13 - Describe the action of the impellers and the...Ch. 13 - Describe a jet pumpCh. 13 - Distinguish between a shallow-well jet pump and a...
Ch. 13 - Describe the difference between a simplex...Ch. 13 - Describe the general shape of the plot of pump...Ch. 13 - Describe the general shape of the plot of total...Ch. 13 - To the head-versus-capacity plot of Problem 13.13...Ch. 13 - To what do the affinity laws refer in regard to...Ch. 13 - Fora given centrifugal pump, if the speed of...Ch. 13 - For a given centrifugal pump, if the speed of...Ch. 13 - For a given centrifugal pump, if the speed of...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - For a given size of centrifugal pump casing, if...Ch. 13 - Describe each part of this centrifugal pump...Ch. 13 - For the line of pumps shown in Fig.13.22 specify a...Ch. 13 - For the line of pumps shown in Fig. 13.22 ,...Ch. 13 - For the 2x310 centrifugal pump performance curve...Ch. 13 - For the 2310 centrifugal pump performance curve...Ch. 13 - Using the result from Problem 13.26 describe how...Ch. 13 - For the centrifugal pump performance curve shown...Ch. 13 - Prob. 13.29PPCh. 13 - State some advantages of using a variable-speed...Ch. 13 - Describe how the capacity, efficiency, and power...Ch. 13 - If two identical centrifugal pumps are connected...Ch. 13 - Describe the effect of operating two pumps in...Ch. 13 - For each of the following sets of operating...Ch. 13 - For the 112313 centrifugal pump performance curve...Ch. 13 - For the 6817 centrifugal pump performance curve...Ch. 13 - Figure 13.52 shows that a mixed-flow pump is...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - Compute the specific speed for a pump operating at...Ch. 13 - It is desired to operate a pump at 1750 rpm by...Ch. 13 - Define net positive suction head (NPSH).Ch. 13 - Distinguish between NPSH available and NPSH...Ch. 13 - Describe what happens to the vapor pressure of...Ch. 13 - Describe why it is important to consider NPSH when...Ch. 13 - For what point in a pumping system is the NPSH...Ch. 13 - Discuss why it is desirable to elevate the...Ch. 13 - Discuss why it is desirable to use relatively...Ch. 13 - Prob. 13.50PPCh. 13 - If we assume that a given pump requires 7.50 ft of...Ch. 13 - Determine the available NPSH for the pump in...Ch. 13 - Find the available NPSH when a pump draws water at...Ch. 13 - A pump draws benzene at 25 C from a tank whose...Ch. 13 - Determine the available NPSH for the system shown...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Determine the NPSH available when a pump draws...Ch. 13 - Repeat Problem 13.56 if the pump is 44 in below...Ch. 13 - Repeat Problem 13.59 if the pump is 27 in above...Ch. 13 - Repeat Problem 13.57 if the pump is 1.2 m below...Ch. 13 - Repeat Problem 13.58 if the pump is installed...Ch. 13 - A pump draws propane at F (sgfrom a tank whose...Ch. 13 - A pump draws propane at 45 C (sg =0.48 ) from a...
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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
- The motor of the pimp consumes 1.05 hp of electricity. The pump increases the pressure of water from 120 kPa to 1100 kPa at a rate of 35 L/min. If the motor efficiency is 95%, the pump efficiency is CHOICES: a.0.85 b.0.88 c.0.78 d.0.75arrow_forwardA centrifugal pump is discharging 900 gpm and which operates at 1800 rpm against a head of 120 ft and maximum efficiency of 91%. If this pump is modified to operate at 1200 rpm, assuming its efficiency remains constant, determine its discharge, the theoretical head it imparts to the liquid and the power input to the pump.arrow_forwardToluene at 35 degrees Celsius is pumped from an open reservoir to a tank kept at a gauge pressure of 150 kPa. The pump itself is 3m below the reservoir, while the discharge tank is 10m above the reservoir. Assuming friction in the suction line is negligible, while in the discharge line the friction head amounts to 7.5 m, determine the net positive suction head available for the pump. If the pump has an efficiency of 65%, determine the total power input. At the given temperature, the density and vapor pressure of toluene are 862 kg/m3 and 40 mmHgarrow_forward
- 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.arrow_forwardThe capacity of a certain pump is 5251 gallons per hour with a capacity of 68.54%. A city uses this pump to extract water from a water supply from a body of water where in the intake is 10.2 ft below the surface of the body of water. A 3-in S40 is used to transfer the water through a pipe with a total length of 8848 ft having a total friction loss of 222.7 (ft-lbf)/lbm. Given that the cost electrical power is 14.7 cents/kWh, what is the hourly pumping cost in cents per hour? Note that in this problem, the inlet to the pump is 35.7 ft above the surface of the body of water while the water level in the tank discharge is always 380 ft above the pump discharge Answer options: 700 557 1175 685 226arrow_forwardHow high must the pump centerline be located above the water level in an open tank that supplies water to the pump if it requires a minimum of 2.5m of NPSH? The barometer reading is 760mmHg, the pipe friction is 0.65m and the vapor pressure is 3.51kPa. 6.82m 5.48m 7.39m 4.99marrow_forward
- An ice plant owner decided to install a water pump from a nearby clean fresh water source to supply its water requirements. The capacity of the pump is 45.5 cu m per hour against a head of 43 meters with an efficiency of 70% at full load and 40% at half load. The total cost of the pumping unit including the piping system of the plant is P 700,000 with zero salvage value at the end of the its estimated life of 20 years. The prime mover of the pump is an electric motor and cost of power is P2.10 per kwh. Taxes, insurances and maintenance cost is 1.5% of the first cost per year. The pump will operate 200 days continuous operation per year at half load and 150 days at full load. If cost of money is 12%, how much will it cost the owner to operate the pump per cubic meter?arrow_forwardDetermine the work output of the turbine Wtarrow_forwardA farmer owns an 8-hp engine. He wants to use it to pump water from a 50-ft deep shallow tube well to irrigate his field. What size of centrifugal pump would you recommend to the farmer? Assume 30% system efficiency.arrow_forward
- assume that the turbine is operating at a temperature of 800 degrees Rankinearrow_forwardDetermine the maximum total head at which a 7hp centrifugal pump can extract at a rate of 350 gpm if the pump efficiency is 50%.arrow_forwardA pump is to deliver 80 GPM of water at 1400F (ρ = 61.424 lb/ft3) with a discharge pressure of 150 psig. Suction pressure indicates 2 inches of mercury vacuum. The diameter of the suction and discharge pipes are five (5) inches and four (4) inches, respectively. The pump has an efficiency of 70%, while the motor efficiency is 80%. DETERMINE: 1. Water horsepower of the pump 2. Brake horsepower of the pump 3. Power input to drive the motor 4. Combined motor-pump efficiencyarrow_forward
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