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A self-priming centrifugal pump is used to pump water at 25°c from a reservoir whose surface is 2.2 m below the centerline of the pump inlet (Fig. P14-60). The pipe is PVC pipe with an ID of 24.0 mm and negligible average inner roughness height. The pipe length from the submerged pipe inlet to the pump inlet is 2.8 m. There are only two minor losses in the piping system from the pipe inlet to the pump inlet: a sharp-edged reentrant inlet (KL = 0.85), and a flanged smooth 900 regular elbow (KL = 0.3). The pump's required net positive suction head is provided by the manufacturer as a curve fit:
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Fluid Mechanics: Fundamentals and Applications
- A 28-in pump is used to deliver water from a lower reservoir to a higher reservoir . The total length of the 10-in-ID pipes is 62 ft. and the friction factor is taken as 0.022. If the pump head H can be defined as a function of discharge Q in ft3/s is: H = 365 - (0.04718Q^2), in feet. What is the operating discharge rate in ft3/s?arrow_forwardWater is pumped from a reservoir to a pressurized storage tank (P = 150 kPa gauge) atop a building by means of a centrifugal pump. There is a 70-m difference in elevation between the water surface in the reservoir and the end of the discharge line. The piping system consists of 80m of 5" SCH 40 steel pipe containing two 90o elbows, one gate valve, one rotary water meter, and six couplings from the reservoir to the pump; 3" SCH 40 steel pipe for 86m to the tank. The 3" pipe contains two gate valves, four 90o elbows, and ten couplings. It is desired to maintain a flow of water into the tank of 2.4 m3/min. Water temperature is 25oC. If the pump-motor set has efficiency of 65%, what would be the pumping costs be in pesos per day if electricity costs PhP 10.50/kW-hr?arrow_forwardWater is pumped between two reservoirs in a pipeline with the following characteristics; (d= 300mm, L= 70m, /= 0.025, minor loss coefficient: YK=2.5). The pump performance curve is approximated by the equation: H,=22.9-650° Where H, is in meters and Q is in m's. Determine the discharge Q and pump head A when two pumps in series are used for total static head (4Z=25m).arrow_forward
- A pump draws 30-°C water at 0.5 liters per second from a pressurized tank where the air pressure above the water is 1.1 atm (abs) . The required NPSH of the pump is 8.2 m. The suction pipe has a diameter of 4 cm, total length of 5.2 m, and friction factor of 0.005. If the pump has a suction lift of 3.8 m, will cavitation occur? Use the properties of sat. liquid water at 30°C.arrow_forwardThe design of a new dam reveals that a water head of 10 meter and water flow rate of 100 cubic meter per second (m3/s) can be supplied for electricity generation. What kind of turbines would you recommend for the electric power generation?arrow_forwardFlowrate of water through bend pipe (90o) is 0.21 m3/s. The pipe diameter at the inlet is 150 mm andthe outlet diameter is 75 mm. The outlet is higher than the inlet by 2 m. Frictional losses in the pipe isequal a loss factor of 0.5 applied to the inlet velocity head. The pressure head at the inlet is 8.6 m andthe volume of water in the bend is 0.6 m3. Calculate the resultant force and its direction.arrow_forward
- A water fountain is to be installed at a remote location by attaching a cast iron pipe directly to a water main through which water is flowing at 70°F and 60 psig. The entrance to the pipe is sharp-edged, and the 70-ft-long piping system involves three 90° miter bends without vanes, a fully open gate valve, and an angle valve with a loss coefficient of 5 when fully open. If the system is to provide water at a rate of 15 gal/min and the elevation difference between the pipe and the fountain is negligible, determine the minimum diameter of the piping system.arrow_forwardCan you use the friction factor for turbulent flow in a smooth circular tube to predict the fiction factor in an internally finned tube by using the hydraulic diameter?arrow_forwardWater at 25oC is pumped at a constant rate of 10 m3/h from a large reservoir resting on the floorto the open top of an experimental absorption tower. The point of discharge 5 m above the floor,and friction losses in the 1-½-in. Schedule 40 steel pipe from the reservoir to the tower amount to2.55 J/kg. At what height in the reservoir must the water level be kept if the pump can deliver only0.1 kW?arrow_forward
- Calculate the water power available in the pipe flowing at the rate of 0.166 m3/s with total Head as 29.9 m. 48691.0 W 5.0 W 4963.4 W 48.7 Warrow_forwardQuestion 2) The centrifugal pump in the figure is in his preference Passing water at 25°C from the tank through the 1.22 m exchange store pumping. Inner diameter of the suction channel is 101.6 mm, in total it is 0.0306 and its length is 3.2 m. It the local coefficients of the user in the pipe are 7.4. If the pump works at a flow rate of 109 m3/h ENPY=1.52 is m. Does the pump work without cavitation at this flow? Show the calculation. For water, p=997 kg/m3 and Pb=3.169 kPa. Piping system at the entrance (Suction pipe) pump 22 Patm=101.3 kPa and 0.2=1.05. vanarrow_forwardAssume a horizontal shaft handling water at 65 deg C (Pv=2.503 KPa, Density=980.5 m3/kg). The suction nozzle is 1.64 m below the pump centerline and the pressure gauge reading at this point is 221Kpag. Determine the NPSHa if the head loss is 0.94 m.arrow_forward
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