In a power plant water supply pumping system, the reservoir is above the pump. Compute the...
In a power plant water supply pumping system, the reservoir is
above the pump. Compute the net po
sitive suction head (NPSH) available if the specific weight, gw of
water is 61.0 lb/ft3, pressure in the t
ank is -153.76 Torr, friction loss in the suction pipe is 5 ft. The
vapor pressure of water is 10 Ft. The di
stance between the center line of pump and the free level of the
fluid source is 8 ft. Atmospheric pre
ssure is 754mm Hg. Compare the computed NPSH available with NPSH
required of 5.9 m.
Homework Answers
NPSHA IS GREATER THAN NPSHR THAT IS
8.1153 > 5.9
HENCE IT WOULD REDUCE CAVITATION.
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In a power plant water supply pumping system, the reservoir is
above the pump. Compute the...
A pump is located 20 feet below a supply reservoir. The head loss in the pipe...
A pump is located 20 feet below a supply reservoir. The head loss in the pipe from the reservoir to pump is 2.6 ft of water. Assuming atmospheric pressure to be 14.7 psia and vapor pressure of water to be 0.256 psia, the Net Positive Suction Head Available (NPSHA) is:
4. The discharge pressure gauge reading is 5 lb/in2 (psi) for the pumping system shown in the ske...
4. The discharge pressure gauge reading is 5 lb/in2 (psi) for the pumping system shown in the sketch below, with the outlet nozzle discharging a 2-inch diameter stream of water directly to the atmosphere. The gauge pressure at the pump suction inlet at the point of incipient cavitation is (-2,071.12) lb/ft, i.e., for vapor pressure of water at 68° F of 50.54 lb/ft2 absolute, and standard atmospheric pressure 30 in Hg. Friction losses in the suction piping from the reservoir...
A centrifugal pump is placed above a reservoir as shown below. If the NPSHR is 17...
A centrifugal pump is placed above a reservoir as shown below. If the NPSHR is 17 ft and the flow rate is 32 ft3/s, determine the maximum height, 21, that the pump can be located above the reservoir surface without cavitation. Assume that the total head loss between the tank and pump inlet is 10 ft. The diameter of the pipe on the suction side of the pump is 12 inches. The reservoir surface is at atmospheric pressure, Patm =...
11. Water is pumped from a reservoir at a lower elevation to an elevated reservoir by...
11. Water is pumped from a reservoir at a lower elevation to an elevated reservoir by using a suitable pump. The lower reservoir water level have an atmospheric pressure head of I and is at an elevation of 20 ft. while the intake/suction side of the pump is at an elevation of 25 ft. The water is pumped at a rate of 425 gpm in a 6" diameter pipe, friction factor () is 0.017 and the length of pipe is...
Problem 4 The pumping system shown in the figure below to deliver 3 cfs of 60°F...
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A centrifugal pump is used to pump water at 77ºF from a reservoir whose surface is 20 ft above th...
A centrifugal pump is used to pump water at 77ºF from a reservoir whose surface is 20 ft above the centerline of the pump inlet. The Pipe System consists of 67.5 ft of PVC pipe with a 1.2 in ID and negligible average internal roughness height. The length of the pipe from the bottom of the lower tank to the pump inlet is 12 ft. There are several minor losses in the pipe: an acute edge entry (KL = 0.5),...
A pumping system is designed to pump from a storage reservoir located at an elevation of...
A pumping system is designed to pump from a storage reservoir located at an elevation of 1015 feet. The pump elevation is 1005 feet. The pump discharge flowrate is 4500 gpm and the water temperature is 100˚F (1 atm). Between the storage tank and the pump is 30 feet of 14-in DIP pipe (f = 0.018) with one rounded entrance (kent = 0.05), and two 45 -degree bends (k45 = 0.30). What is the NPSH (in ft) for this system?...
A pumping system is designed to pump from a storage reservoir located at an elevation of...
A pumping system is designed to pump from a storage reservoir located at an elevation of 1015 feet. The pump elevation is 1005 feet. The pump discharge flowrate is 4500 gpm and the water temperature is 100°F (1 atm). Between the storage tank and the pump is 30 feet of 14-in DIP pipe ( = 0.018) with one rounded entrance (k = 0.05), and two 45 -degree bends (k = 0.30). What is the NPSH (in ft) for this system?...
A pump delivers water at 200C between a reservoir and a water tank that is 75[ft] higher than the...
A pump delivers water at 200C between a reservoir and a water tank that is 75[ft] higher than the reservoir. The suction side of the system consists of a cast iron pipe of 1[ft]diameter with a strainer (Ks= 2.5) and four 90-degree bends at R/D= 5. The discharge side of the system includes a 1000[ft] long commercial steel pipe with 12” diameter followed by a gate valve. The NPSH required for the pump is 10[ft], and the design discharge is...
Problem 1 (25 points) A pumping system is designed to pump from a storage reservoir located...
Problem 1 (25 points) A pumping system is designed to pump from a storage reservoir located at an elevation of 1015 feet. The pump elevation is 1005 feet. The pump discharge flowrate is 4500 gpm and the water temperature is 100°F (1 atm). Between the storage tank and the pump is 30 feet of 14-in DIP pipe (f =0.018) with one rounded entrance (kent = 0.05), and two 45 -degree bends (kas = 0.30). What is the NPSH (in ft)...
A pump is located 20 feet below a supply reservoir. The head loss in the pipe from the reservoir to pump is 2.6 ft of water. Assuming atmospheric pressure to be 14.7 psia and vapor pressure of water to be 0.256 psia, the Net Positive Suction Head Available (NPSHA) is:
4. The discharge pressure gauge reading is 5 lb/in2 (psi) for the pumping system shown in the sketch below, with the outlet nozzle discharging a 2-inch diameter stream of water directly to the atmosphere. The gauge pressure at the pump suction inlet at the point of incipient cavitation is (-2,071.12) lb/ft, i.e., for vapor pressure of water at 68° F of 50.54 lb/ft2 absolute, and standard atmospheric pressure 30 in Hg. Friction losses in the suction piping from the reservoir...
A centrifugal pump is placed above a reservoir as shown below. If the NPSHR is 17 ft and the flow rate is 32 ft3/s, determine the maximum height, 21, that the pump can be located above the reservoir surface without cavitation. Assume that the total head loss between the tank and pump inlet is 10 ft. The diameter of the pipe on the suction side of the pump is 12 inches. The reservoir surface is at atmospheric pressure, Patm =...
11. Water is pumped from a reservoir at a lower elevation to an elevated reservoir by using a suitable pump. The lower reservoir water level have an atmospheric pressure head of I and is at an elevation of 20 ft. while the intake/suction side of the pump is at an elevation of 25 ft. The water is pumped at a rate of 425 gpm in a 6" diameter pipe, friction factor () is 0.017 and the length of pipe is...
Problem 4 The pumping system shown in the figure below to deliver 3 cfs of 60°F water. The total elevation difference between is 84 ft. The suction line is a 6-inch diameter, 300-ft long cast-iron pipe. The discharge line is 6-inch diameter in an 860-ft long plastic pipe. The suction inlet for the pump is 20 ft above the reservoir. The atmospheric pressure is 14.70 psia. The required NPSH is 7.0 ft. Minor losses include entrance: k, = 0.5, open...
A pumping system is designed to pump from a storage reservoir located at an elevation of 1015 feet. The pump elevation is 1005 feet. The pump discharge flowrate is 4500 gpm and the water temperature is 100°F (1 atm). Between the storage tank and the pump is 30 feet of 14-in DIP pipe ( = 0.018) with one rounded entrance (k = 0.05), and two 45 -degree bends (k = 0.30). What is the NPSH (in ft) for this system?...
Problem 1 (25 points) A pumping system is designed to pump from a storage reservoir located at an elevation of 1015 feet. The pump elevation is 1005 feet. The pump discharge flowrate is 4500 gpm and the water temperature is 100°F (1 atm). Between the storage tank and the pump is 30 feet of 14-in DIP pipe (f =0.018) with one rounded entrance (kent = 0.05), and two 45 -degree bends (kas = 0.30). What is the NPSH (in ft)...
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