Water to a residential area is transported at a rate of 1.5 m³/s via 70-cm-internal-diameter concrete pipes with a surface roughness of 3 mm and a total length of 1500 m. In order to reduce pumping power requirements, it is proposed to line the interior surfaces of the concrete pipe with 2-cm-thick petroleum-based lining that has a surface roughness thickness of 0.04 mm. There is concern that reducing the pipe diameter to 66 cm and thereby increasing the average velocity may offset any gains from reducing roughness. Assuming values of p = 1000 kg/m² and v = 1 × 10* m³/s for water, determine the percent decrease (or increase) in the pumping power requirements due to frictional losses as a result of lining the concrete pipes.

Water to a residential area is transported at a rate of 1.5 m³/s via 70-cm-internal-diameter concrete pipes with a surface roughness of 3 mm and a total length of 1500 m. In order to reduce pumping power requirements, it is proposed to line the interior surfaces of the concrete pipe with 2-cm-thick petroleum-based lining that has a surface roughness thickness of 0.04 mm. There is concern that reducing the pipe diameter to 66 cm and thereby increasing the average velocity may offset any gains from reducing roughness. Assuming values of p = 1000 kg/m² and v = 1 × 10* m³/s for water, determine the percent decrease (or increase) in the pumping power requirements due to frictional losses as a result of lining the concrete pipes.

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

A gardener is thinking of installing piping system for watering the plants in his garden located near a water reservoir. The reservoir is located at an elevation of 150 m above from the surface, as shown in figure. The diameter of pipe (cast iron) is constant equal to 15 cm and total length of pipe is 180 m. It is desirable that the exit velocity of water to the garden should not exceed 5 m/sec and water is at atmospheric pressure and temperature is 20°C. The gardener is planning to open the valve for 3 hours daily. Calculate the followings: a) How much volume of liquid can be drawn from reservoir in a day? b) How much total irreversible head loss will be occurred in the system?
Please verify my answer
A pumped storage power plant with a head of 150 m, with a flow rate of 6 cms for power generation and pumping, and continuous operation for 8 hours each time. Try to find (1) the power output during power generation and the total daily power generation; (2) pumping water Hourly power and total daily power demand; (3) Pumped storage power plant efficiency; (4) Adjust the pool capacity? Assuming that the water loss is 8% of the total drop, the combined efficiency of the turbine and generator is 85%, and the efficiency of the pump is 65%.
The drinking water needs of an office are met by large water bottles. One end of a 0.35-in-diameter, 6-ft-long plastic hose is inserted into the bottle placed on a high stand, while the other end with an on/off valve is maintained 3 ft below the bottom of the bottle. If the water level in the bottle is 1 ft when it is full, determine how long it would take to fill an 8-oz glass (= 0.00835 ft3) (a) when the bottle is first opened and (b) when the bottle is almost empty. Take the total minor loss coefficient, including the on/off valve, to be 2.8 when it is fully open. Assume the water temperature to be the same as the room temperature of 70°F.
A vented tanker is to be filled with fuel oil with p = 920 kg/m³ and μ = 0.045 kg/m-s from an underground reservoir using a L=25-m-long, 4-cm-diameter plastic hose with a slightly rounded entrance and two 90° smooth bends. The elevation difference between the oil level in the reservoir and the top of the tanker where the hose is discharged is 5 m. The capacity of the tanker is 18 m³ and the filling time is 30 min. Taking the kinetic energy correction factor at the hose discharge to be 1.05 and assuming an overall pump efficiency of 82 percent, determine the required power input to the pump. Tanker 18 m³ 4 cm- ✓ Lm Pump The required power input to the pump = KW
The drinking water to a village is supplied from a reservoir which is 475 m above and 25 km away from the village. The water is transported from the reservoir to an open-top storage tank in the village via a circular pipe with a diameter of 18 cm and a roughness of 0.15 mm. The population of the village is 1500 people. There are two valves (K=2) and five 90° elbows (K=1.5) along the pipe. Assuming that an average person in the village consumes 225 L/day, determine the power (kW) of the pump needed to transter the water from the reservoir to the storage tank. You can take the density and viscosity of water as 1000 kg/m and 0.001 kg/m s, respectively, and you can neglect the inlet and exit losses and the kinetic energy correction factor effects.
Water drains from a pressurized tank (50 kPa gage) through a 0.1m-diameter pipe system at a rate of 0.0371 m³/s. If the density of water is 1000 kg/m³ and the dynamic viscosity is 1.12 x 10 - 3 Ns/m², the Reynolds number would be equal to O 3312 O 25893 O 422321 O 475892
A water distribution system is supplied from a water reservoir with a bent pipe as shown in the figure. The pipe friction factor f is 0.024. Ignoring all minor losses, the Velocity in the pipe is. d = 100 mm 25 m O a. 11.4 m/s а. O b. 15 m/s 150 m Ос. 3.4 m/s O d. 2.14 m/s
A 2.4-m-diameter tank is initially filled with water 4 m above the center of a sharp-edged 10-cm-diameter orifice. The tank water surface is open to the atmosphere, and the orifice drains to the atmosphere. Neglecting the effect of the kinetic energy correction factor, calculate (a) the initial velocity from the tank and (b) the time required to empty the tank. Does the loss coefficient of the orifice cause a significant increase in the draining time of the tank?
The geometrical head (height) of the turbine located in a hydraulic plant is 220m. The penstock for this turbine has a diameter of 53 cm and a total length of 375 m up to the turbine inlet. The continuous head loss coefficient in the pipe is 0.02. There are 3 elbows with a loss coefficient of 0.3 each and a valve with a loss coefficient of 6.8 in fully open condition on the penstock pipe. Turbine flow rate is 320 L/s, efficiency is 82% and speed is n= 750 rpm. (Psu= 998 kg/m³)wather v? P1 + as 29 P2 + az + z1 + hpompa.f = pg L V² + z2 + h¢arbing + hg,toplam_hg.sûrekli= f. 2g pg Wmil = hx.yeret =Kx hg,toplam= hx sürekli + hx,yerel Nsp Протра (gH)3/4 1/2 wWmil p1/2(gH)5/4 WB (DB Wmil,B _ PB (WB Nst = Wmil = pgHỳNtürbin , %3D %3D WA DA Wmil,a PA WA Wmil = prwv(V; - rw)(1 – cosß) a) Find the net drop of the turbine. b) Find the specific velocity of the turbine. c) Find the specific velocity of the turbine. 0,128 0,128 250,21 m 0,351 0,351 295,14 m 0,148 0,148 281,41 m 0,228 0,228 201,44 m…