A centrifugal pump takes water from the bottom of a supply tank and delivers it into...
A centrifugal pump takes water from the bottom of a supply tank
and delivers it into the
bottom of another tank. The water level in the discharge tank is
50m above the level in
the supply tank. The line between the tanks is 200m of 4-in
commercial steel pipe. The
ow rate is 1200 l/min. In the line, there two gate valves, four
standard tees and four
elbows. What is the energy cost of the running this pump for one
24-h day? The density
and kinematic viscosity of water are 1000 kg/m3 and 10^-6 m2/s,
respectively. The energy
cost is $0:20 kWh, and the eciency of the pump is 70%.
Homework Answers
Obtain the friction factor from Moody's chart by using Reynolds number and relative roughness. Then
apply Bernoulli's equation at the points considered. Then by using corresponding formulae obtain the power required, mass flow rate and energy cost.
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A centrifugal pump takes water from the bottom of a supply tank
and delivers it into...
1 A pump delivers water from the lower reservoir to the upper reservoir at a rate of 60 L/s. Both...
1 A pump delivers water from the lower reservoir to the upper reservoir at a rate of 60 L/s. Both the suction and discharge pipes are DN 150 schedule 40steel pipe. The length of the suction pipe leading to the pump is 3.5 m, and 7 m of discharge pipe extend from the pump outlet to the upper tank. There are three standard 900 elbows and a fully open gate valve. The depth of the fluid level inside the lower...
A pump carries water at a temperature of 30 ° C from one tank (A) to...
A pump carries water at a temperature of 30 ° C from one tank
(A) to another (B). The diameter of the pipe leaving tank A and
reaching the pump is 4 inches. The diameter of the pipe leaving the
pump and reaching tank B is 3 inches. The pump motor increases the
fluid pressure by 3 kgf / cm2 (ΔP), and generates a power per unit
of mass of 300 J / kg. Calculate the height difference (ΔZ) between...
A pump transports water from Tank 1 to Tank 2 through a constant-diameter piping system as...
A pump transports water from Tank 1 to Tank 2 through a constant-diameter piping system as shown below (not to scale). The flow rate is controlled by two gate valves, the gate valve I controls the main pipeline, while the gate valve II controls the loop line from T-joint A to T-joint B. All pipes are galvanized steel pipe of diameter D = 4 in. It has a total length of Li2= 620 ft from tank 1 to tank 2....
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...
A centrifugal pump operating under steady flow conditions delivers 2,270 kg/min of water from an initial...
A centrifugal pump operating under steady flow conditions delivers 2,270 kg/min of water from an initial pressure of 82,740 Pa to a final pressure of 275,800 Pa. The diameter of the inlet pipe to the pump is 15.24 cm and the diameter of the discharge pipe is 10.16 cm. What is the work?
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),...
6. Consider the installation for the water supply, shown in the figure where friction for the short run of pipe between...
6. Consider the installation for the water supply, shown in the figure where friction for the short run of pipe between the supply tank and pump can be ignored, and in which nodes 1 and 2 are essentially at the same elevation. The equation for the pressure increase (kPa) across the centrifugal pump is: Ap p2-P1 =6.895-0.002021Q2 where the unit of Q4 is liter/s. Compute the flow rates Q Qp and Qc in liter/s, and the pressures(gauge) p, P2, P,...
Water at 160° Fis drawn at the rate of 400 gal/min from a vented tank into...
Water at 160° Fis drawn at the rate of 400 gal/min from a vented tank into the 2-in Sch 40 suction line of the pump made of steel. The suction line has a total length of 10 ft. the discharge line elevates the water 30 ft to the level of the large heat exchanger. The discharge line has a total length of 40 ft. The system contains: 2 standard elbows, 1 swing check valve, and 4 open gate valves. Assuming...
Water is pumped at a rate of 10 litres/s from a pond to an open tank....
Water is pumped at a rate of 10 litres/s from a pond to an open tank. The pipe is 30 m in length and made of 1-in, Schedule 40 (I.D = 0.02664 m) commercial steel pipe with the surface roughness of 0.0018 in (0.045 mm). In the pipelines, there are two gate valves, one globe valve and three 90o long-radius elbows. The surface of water in the tank is 3 m above the surface of the pond. (The density of...
A pump that is 80% efficient pumps water from the lower tank to the upper tank...
A pump that is 80% efficient pumps water from the lower tank to the upper tank at a flow rate of 0.01 m/s through 70 meters of 10-cm diameter pipe. In this system there are two regular, screwed 90 degree elbows and a fully open screwed angle valve. Assume the reservoir exits and entrances are sharp. The friction factor,f, of the pipe is 0.02. What horsepower pump is needed to achieve this flow rate? Use: Pwater = 998 kg/m2; Mwater...
1 A pump delivers water from the lower reservoir to the upper reservoir at a rate of 60 L/s. Both the suction and discharge pipes are DN 150 schedule 40steel pipe. The length of the suction pipe leading to the pump is 3.5 m, and 7 m of discharge pipe extend from the pump outlet to the upper tank. There are three standard 900 elbows and a fully open gate valve. The depth of the fluid level inside the lower...
A pump carries water at a temperature of 30 ° C from one tank
(A) to another (B). The diameter of the pipe leaving tank A and
reaching the pump is 4 inches. The diameter of the pipe leaving the
pump and reaching tank B is 3 inches. The pump motor increases the
fluid pressure by 3 kgf / cm2 (ΔP), and generates a power per unit
of mass of 300 J / kg. Calculate the height difference (ΔZ) between...
A pump transports water from Tank 1 to Tank 2 through a constant-diameter piping system as shown below (not to scale). The flow rate is controlled by two gate valves, the gate valve I controls the main pipeline, while the gate valve II controls the loop line from T-joint A to T-joint B. All pipes are galvanized steel pipe of diameter D = 4 in. It has a total length of Li2= 620 ft from tank 1 to tank 2....
6. Consider the installation for the water supply, shown in the figure where friction for the short run of pipe between the supply tank and pump can be ignored, and in which nodes 1 and 2 are essentially at the same elevation. The equation for the pressure increase (kPa) across the centrifugal pump is: Ap p2-P1 =6.895-0.002021Q2 where the unit of Q4 is liter/s. Compute the flow rates Q Qp and Qc in liter/s, and the pressures(gauge) p, P2, P,...
Water at 160° Fis drawn at the rate of 400 gal/min from a vented tank into the 2-in Sch 40 suction line of the pump made of steel. The suction line has a total length of 10 ft. the discharge line elevates the water 30 ft to the level of the large heat exchanger. The discharge line has a total length of 40 ft. The system contains: 2 standard elbows, 1 swing check valve, and 4 open gate valves. Assuming...
A pump that is 80% efficient pumps water from the lower tank to the upper tank at a flow rate of 0.01 m/s through 70 meters of 10-cm diameter pipe. In this system there are two regular, screwed 90 degree elbows and a fully open screwed angle valve. Assume the reservoir exits and entrances are sharp. The friction factor,f, of the pipe is 0.02. What horsepower pump is needed to achieve this flow rate? Use: Pwater = 998 kg/m2; Mwater...
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