A new pump is required for the water supply system of a high-rise office building. The system requires 0.06 m³/s of water pumped to a reservoir at the top of the tower 340 m above the street. City water pressure at the street-level pump inlet is 400 kPa gage. The piping is to be commercial steel, the overall length is 20 percent greater than the tower height, and there are fittings every 10 m with loss coefficients of 0.2. Determine the minimum diameter required to keep the average water velocity below 3.5 m/s in the pipe. Calculate the pressure rise required across the pump and estimate the minimum power needed to drive the pump.

A new pump is required for the water supply system of a high-rise office building. The system requires 0.06 m³/s of water pumped to a reservoir at the top of the tower 340 m above the street. City water pressure at the street-level pump inlet is 400 kPa gage. The piping is to be commercial steel, the overall length is 20 percent greater than the tower height, and there are fittings every 10 m with loss coefficients of 0.2. Determine the minimum diameter required to keep the average water velocity below 3.5 m/s in the pipe. Calculate the pressure rise required across the pump and estimate the minimum power needed to drive the pump.

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

how to do
20. In a repair shop compressed air is used to operate pneumatic tools. The total length of the airline including all the loss coefficients in terms of equivalent length is about 152.5 m (500 ft). The airline consists of smooth pipe of I.D. = 1.27 cm. Air is compressed to 0.345 MPa (50 psia) and then cooled to 24 C (75 F) when entering the line at a velocity of 2.4 m/s (8 ft/s). Find pressure when air is used to operate the pneumatic tool. To Pneumatic tool Air intake Compressor
At a hydroelectric plant the difference in elevation between the surfaace of the water at the intake and at the tailrace is 183m (600ft). When the flow is 80 cfs, the friction loss in the penstock is 60 ft and the head utilized by the turbine is 460 ft. The mechanical friction in the turbine is 100hp, and the leakage loss is 3 cfs. Find (a) hydraulic efficiency; (b) volumetric efficiency; (c) power delivered to shaft; (d) brake horse power, (e) mechanical efficiency; (f) over-all efficiency.
In a ship's machinery space, a large sea water tank has a drain connected to the ship's hull by 20 metres of 50 mm pipe as illustrated in Figure 2.2 below. The drain pipeline can be assumed to have a friction factor of 0.024 and to comprise of sharp ends at inlet and outlet, three 90 degree bends, each having a k factor of 0.7 and two gate valves with ak factor of 1.2 each. The water level in the tank is 10 m above sea level. Determine the initial flow rate of water to the sea when the tank is being drained. Point 1 Sea Water Tank 10 m Point 2 Sea Water Level Drain line Ship's Hull Figure 2.2 Sea water tank drain line Solution Applying Bernoulli's equation to the fluid in the tank at point 1 and the sea water at point 2 and letting h = the total head loss, we obtain. + Z, =2+ 2g + Z2 + h %3D pg pg 2g
Assume a horizontal shaft handling water at 65 deg C (Pv=2.503 KPa, Density=980.5 m3/kg). The suction nozzle is 4.38 m below the pump centerline and the pressure gauge reading at this point is 221Kpag. Determine the NPSHa if the head loss is 0.74 m.
The water needs of a small farm are to be met by pumping water from a well that can supply water continuously at a rate of 50 L/min. The water level in the well is 13 m below the ground level, and water is to be pumped to the farm by a 2-cm internal diameter pipe. The required length of piping is measured to be 20 m, and the total head loss in the piping system is estimated to be 10 m.a) Using Bernoulli equation, determine the pressure difference between the two points (A & B).
A Kaplan turbine develops 1500 kw under ahead of 6 m. the turbine is set 2.5 m above the tail race while the draft tube has a submerged part length of 1.3m. A pressure gauge that installed at turbine outlet records a pressure head Of -3.1. if the overall efficiency of the turbine is 85% and the inlet draft tube diameter is 3m, determine the outlet diameter of the draft tube. Assume no leakage of water in the turbine and the losses through the draft tube is half the kinetic energy at turbine discharge.
A liquid (SG = 0.8 and μ = 5 CP = 0.00336 lbm/ft s) from a solvent recovery plant is being pumped from a vessel into a reactor. The flow rate to the rector is 100 GPM (0.2228 ft³/s,) and the line, schedule 40-carbon steel (a = 0.0018 in). The pressure in the vessel is 15 psig and the reactor is pressurized to 65 psig. The flow into the reactor is 25 ft below the level in the vessel as shown in the drawing. The centrifugal pump is located 5 ft below the level in the vessel. The piping consists of the following: Suction line 10 ft of 2.5" Pipe Gate valves 90 degree elbows Check valves 2" sch 40 pipe 2.5" Sch 40 pipe Gate valve Check Valve 90° elbows 2 2 1 ID = 2.067" ID=2.47" K = 8 ft K= 100 fr K = 30 ff Discharge line 325 ft of 2" 2 5 none Acs=0.0233 ft² Acs = 0.0332 ft² a. Determine the velocity in the 2.5" and 2" lines (ft /s). b. Determine the losses due to friction in both the suction and discharge lines (ft lbi/lbm). c. Estimate the amount of total dynamic head required of the pump…
The system consists of: 1. Stainless steel pipes with a diameter of 5 cm and a total length of 200 meters. 2. Four control valves distributed throughout the system. 3. Two centrifugal pumps in series, each with an efficiency of 80%. Over the past few weeks, a pressure of 20 bar has been recorded at the inlet of the first pump, but only 15 bar at the outlet of the second pump. Furthermore, the flow rate has decreased from 10 m³/h to 7 m³/h. It has been noted that one of the control valves is showing signs of wear and may not be functioning properly. Calculates the pressure loss in the system, taking into account the length of the pipes, the material, the valves and the pumps.
What is the pressure drop in the turbine? Answer: 1176.91 kPa (replace “turbine pressure drop” for “pump pressure increase”)
Water from a reservoir is pumped over a hill through a pipe 3 ft. in diameter, and a pressure of 35 psi is maintained at the summit, where the pipe is 300 ft above the reservoir. The quantity pumped is 55 cfs, and by reason of friction in the pump pipe there is 10 ft of head loss between the reservoir and the summit. What amount of energy must be furnished the water by the pump in kilowatts?
A pump is used to raise water from open tank to another one. If the pipe diameter is 300 mm, Length is 70 m, friction factor is 0.025 and total K is 2.5, the characteristic equation is Hp%3D22.9+10.7Q-111Q Find the flow rate and the head of the pump in the following cases: 1. AZ=15 m with single pump used 2. AZ=15 m with two pumps are connected in parallel 3. AZ=25 m with two pumps are connected in series