A pump draws water from a reservoir and delivers it through a pipe 200 mm in diameter, 120m long to a tank 20 m higher than that of the reservoir. The flow rate is 0.2 m3/s until a power failure. If the minor losses are neglected and assuming that the pump stops simultaneously, determine how long the flow into the tank continues after the power failure.

A pump draws water from a reservoir and delivers it through a pipe 200 mm in diameter, 120m long to a tank 20 m higher than that of the reservoir. The flow rate is 0.2 m3/s until a power failure. If the minor losses are neglected and assuming that the pump stops simultaneously, determine how long the flow into the tank continues after the power failure.

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

Water with density of 998 kg/m3 flows from a lake through a device inside the building at rate of 0.11 m³/s as shown in figure below. The piping system has length and diameter of 91.5 m, 0.12 m respectively. ● (1) Is the device inside the building a pump or a turbine? Justify your answer. Determine the horsepower of the ● device. Neglect all minor losses and assume the friction factor is 0.025. Lake Int 10 m
1. Flow through a pipe with cross sectional area of 15m^2 has an average velocity of 10 m/s. A pump is located downstream 30m vertically lower. Losses in the pipe are 10%. The pump is only 70% efficient. The pump driver is 70% efficient. Calculate Power 2. Determine the income of the plant if its capacity is 60% / day. Transmission losses = 5%. Capacity at 60% will yield a profit of 5 cents per kWh.
(b) Figure Q2(b) shows water at 25°C flows through a 60 mm diameter 30 m long galvanized iron pipe from a tank. The pump power is 40 kW and its efficiency is 80%. If the water flows at 0.046 m³/s, determine the height difference between the level of water in the tank and the nozzle. Neglect the minor losses that occur in the piping system. 60-mm-diameter, 30-m-long pipe; 40-mm-diameter nozzle Pump Figure Q2(b)
1. To model power production in a traditional hydroelectricity unit, we can use the below schematic figure. Water (e= 998 kg/m3, µ = 0.001 kg/m.s) flows from a large tank at elevation 60 m through a cast iron pipe with total length of L diameter 0.1 m. There are three losses associated with sharp-edge entrance, 90° reg- ular elbow and an open globe valve. Outlet of the valve is discharged to atmosphere. The velocity of the water in the pipe is 3 m/s. For minor losses use values for a flanged pipe with diameter of 4". Find the power produced in the turbine in kW 100 m and unit. Hint: If we write energy grade equation between point 1 (surface of water in tank) and point 2 (left hand side of the valve);" P V P V + 21 – hturbine - Ahtot 2g + 2 pg pg 2g where, P = P2 = Patm and Vi 0 (large tank) Sharp-odge entrance 60 m Elbow Turbine Ginhe Valhe
Two tanks A and B are connected by a pipe 30 m long. The first 21 m has a diameter of 75 mm and then is suddenly reduced to 50 mm for the next 9 m. The difference of levels between the tank water levels is 2.40 m. Pipe coefficient f=0.005 and the contraction coefficient at sudden change in area is 0.58. Find all the losses, in terms of velocity v2 at exit from the 50 mm2pipe and hence find rate of flow. Draw the Hydraulic gradient line.
A certain hydropower plant is being supplied by river flow of 900 cubic ft/sec and the head on the site is 200 ft. To develop maximum capacity it was proposed to install 2 turbines, one of which is 1.5 times the capacity of the other. Both turbine units are assumed to have efficiency of 85%. Determine (a) the total power developed, (b) what is the power developed by turbine #1 and by turbine #2 and (c) Rotative speed of each turbine unit assuming specific speed equal to 70 rpm.
What is the minimum power required from the pump to deliver the oil from Reservoir A to Reservoir B as shown in Figure 2 at a rate of 0.30m³/s? The pump has a 70% efficiency rating. V Reservoir A -Oil v= 10-5 m²/s p=950kg/m³ Elevation 135m Steel Pipe, ks =0.046mm, L= 200m, D=250mm Elevation 120m r/D=0.1 Pump Figure 2 r/d=1 Reservoir B abrupt Globe valve, wide open Air at 200kPa Elevation 110m Elevation 100m
The water system in a suburban area consists of an old 200mm pipeline 760m long which conveys water from a pump to a reservoir whose water surface is 107m higher than the pump. Water is pumped at the rate of 0.07 m³/s. Determine the horsepower saved by replacing the old pipe with a new 250mm pipe. Assume the value of f as equal to 0.033 and 0.022, respectively, for the old and new pipes. Neglect losses of head except friction head.
A pipe is used for energy transmission. Length and diameter of pipe are 80 m and 45 cm respectively. Flow rate is 105 lit/s. Calculate friction loss. Neglect minor losses. Take f = 0.03 .
Water flows through a corner valve at a flow rate of Q=0.75 m³/s . The pressure just upstream of the valve is P₁ = 500 kPa and the pressure just downstream is P₂ = 300 kPa. The inside pipe diameters of the valve inlet and exit are respectively, D₁ = 5 cm and D₂ = 12 cm. If the flow through the valve occurs in a horizontal plane, determine the head loss, h₂ (in meters) and the rate of loss of available energy (in W) across the valve. D2 Di
A 5 kW electric motor driving a pump has an efficiency of 85%. Determine the losses encountered in the driver.