In a pumping system handling water, the level in the suction tank is 3m below the pump shaft centerline; and the level in the discharge tank is 21m above the pump shaft centerline. The inlet piping is 7.62cm in diameter and together with its valves fittings is equivalent to 26m straight pipe. The discharge line, 6.35 cm in diameter, with its valves and fittings is equivalent to 72 m straight pipe. If the motor delivers 7.1 kW to the pump shaft, what is the pump efficiency for discharge rate of 12.6 Ips? Assume f = 0.024

In a pumping system handling water, the level in the suction tank is 3m below the pump shaft centerline; and the level in the discharge tank is 21m above the pump shaft centerline. The inlet piping is 7.62cm in diameter and together with its valves fittings is equivalent to 26m straight pipe. The discharge line, 6.35 cm in diameter, with its valves and fittings is equivalent to 72 m straight pipe. If the motor delivers 7.1 kW to the pump shaft, what is the pump efficiency for discharge rate of 12.6 Ips? Assume f = 0.024

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

At the bottom of a pressurized water tank is a mouth with a diameter of 5 cm, where water is discharged into the atmosphere. The water level is 2 m above the outlet. The tank air pressure above the water level is 300 kPa (absolute) and the atmospheric pressure is 100 KPA. Determine the initial rate of water discharge (volumetric flow rate) from the tank, neglecting the effects of friction.
4. Hydroelectric plants in the mountains bring water from a reservoir down to a turbine through enclosed tubes. In such plants, the 100 cm diameter intake tube (Point 2) in the dam is 50m below the water surface (Point 1) of the reservoir. The water drops 200 m through the tube before flowing into the turbine through a 50 cm diameter nozzle.
1. Water flows through a venturi meter. At the constricted section where the area is 24cm², the pressure is 10.2N/cm², and at the section where the area is 64cm², the pressure is 18.0N/cm². Determine the velocities of water in the larger and smaller pipes and the rate of flow. 2. Why is a water tower generally placed on top of a hill? If the hill is 50m high, can it supply water to the top of a 100-m tal officebbuilding? If not, how does water get to that floor?.
Water 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?
Water at 15°C is to be discharged from a reservoir at a rate of 18 L/s using two horizontal cast iron pipes connected in series and a pump between them. The first pipe is 20 m long and has a 6-cm diameter, while the second pipe is 35 m long and has a 3-cm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged, and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head and the minimum pumping power to maintain the indicated flow rate.
Water at 15°C is to be discharged from a reservoir at a rate of 18 L/s using two horizontal cast iron pipes connected in series and a pump between them. The first pipe is 20 m long and has a 6-cm diameter, while the second pipe is 35 m long and has a 3-cm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged, and losses associated with the connection of the pump are negligible.Using appropriate software, investigate the effect of the second pipe diameter on the required pumping head to maintain the indicated flow rate. Let the diameter vary from 1 to 10 cm in increments of 1 cm. Tabulate and plot the results
Water at 15°C is to be discharged from a reservoir at a rate of 18 L/s using two horizontal cast iron pipes connected in series and a pump between them. The first pipe is 5 m long and has a 6-cm diameter, while the second pipe is 5 m long and has a 4-cm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged, and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head and the minimum pumping power to maintain the indicated flow rate. (The density and dynamic viscosity of water at 15°C are ρ = 999.1 kg/m3 and μ = 1.138x10-3 kg/m.s. The loss coefficient is KL = 0.5 for a sharp-edged entrance. The roughness of cast iron pipes is ε= 0.00026 m.)
The diameter of the discharge pipe of pump is 15 cm and that of intake pipe is 20 cm. The pressure gage at discharge reads 257 kPa and a vacuum gage at intake reads 195mm Hg. The flow rate is 90000 L/min and the applied torque in the pump shaft is 6.5 kN.m for a mechanical efficiency is 88% determine a.) the pump used; b.) the pumps to be used for a four-parallel pump arrangement.
Water at 15°C is to be discharged from a reservoir at a rate of 18 L/s using two horizontal cast iron pipes connected in series and a pump between them. The first pipe is X= 5 m long and has a 6-cm diameter, while the second pipe is 5 m long and has a 4-cm diameter. The water level in the reservoir is 30 m above the centerline of the pipe. The pipe entrance is sharp-edged, and losses associated with the connection of the pump are negligible. Neglecting the effect of the kinetic energy correction factor, determine the required pumping head and the minimum pumping power to maintain the indicated flow rate. (The density and dynamic viscosity of water at 15°C are ρ = 999.1 kg/m3 and μ = 1.138x10-3 kg/m.s. The loss coefficient is KL = 0.5 for a sharp-edged entrance. The roughness of cast iron pipes is ε= 0.00026 m.)
Water at 70°F flows by gravity from a large reservoir at a high elevation to a smaller one through a 60-ft-long, 2-in-diameter cast iron piping system that includes four standard flanged elbows, a well-rounded entrance, a sharp-edged exit, and a fully open gate valve. Taking the free surface of the lower reservoir as the reference level, determine the elevation z1 of the higher reservoir for a flow rate of 10 ft3/min.
6 cm-diameter commercial steel pipeline is used to transport water at 10⁰C from a reservoir to a free discharge point. The pipeline consists of 85 m straight pipe, 2 wide open gate valves, 1 wide open angle valve, 4 standart 90⁰ elbows, 1 entrance from a reservoir and 1 free discharge. The elevation of the entrance is 10 m while the elevation of the discharge is 35 m. The inlet pressure is 20 psig and exit pressure is 0 psig. A pump is installed in the line to move the water. Calculate the pump work (J/kg) so the volumetric flow rate will be Q= 0.01 m3/s. (1 psi = lbf/in2).
A Francis turbine is installed with a vertical draft tube. The top of the draft is 1.0 m below thecenter line of spiral casing while the tail race water level is 3.0 m from the top of the draft tube. There is no velocity of whirl at the top or bottom of the draft tube and leakage are negligible. Theelevation of water from the reservoir to the center line of the turbine spiral casing is 50 m, and watervelocity at the inlet is 5 m/sec. Discharge is 2.5 cu.m/sec, hydraulic efficiency is 86%, overallefficiency of 83%. Determine the reading of a pressure gage (in psi) if one is installed at thepenstock just before the water inlet to the turbine.