Service Engineering (a) A cold-water storage cistern is 70m vertically above a centrifugal pump which is to be used for raising60000 litres of water from a low-level break cistern every 4 hours. Allowing 20 percent of the height for pipefriction, and the efficiency of the pumping equipment is 88%,calculate the cost of pumping water continuously for one fortnight, with a mandatory cool down of four hourseach day, if the electricity rate is $7.00 for first 100Kw and then $10.00 for next 1100Kw.(b)Calculate the time in hours that it will take to raise the temperature of 150kg of water from 10°C to100°C by means of a 3 kW immersion heater when the heat losses are 10 percent and the specific heatcapacity of water is 4.2 kJ.

a) The cost of pumping water continuously for one fortnight, with a mandatory cool down of four…

Answered: (a) A cold-water storage cistern is 70m…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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USE EXCEL Water at 20 degrees celsius is to be pumped from a reservoir (ZA=2m) to another reservoir at a higher elevation (ZB=9m) through two 25 m long plastic pipes connected in parallel. The diameters of the two pipes are 3cm and 5cm. Water is to be pumped by a 68 percent efficient motor pump unit that draws 7kw of electric power during operation. The minor losses and the head loss in the pipes that connect the parallel pipes to the two reservoirs are considered to be negligible. Determine the total flow rate between the reservoirs and the flow rates through each of the parallel pipes
Water is pumped at the rate of 20 m3/s from the reservoir located at elevation 100 m and out through a 1.5-m suction line 200 m long connected to a steel pipe of 1.2-m diameter (after the pump) that is 150 m long to another reservoir (Elevation 140 m). If the pump is located at Elevation 110m, take the Hazen William's Constant to be 100 for all the pipes, determine the electrical rating of the pump if it is known to be 86% efficient. 23307.30 HP 27101.51 HP 16218.54 HP 36138.69 HP None of the above
Calculate the required pipe diameter to avoid cavitation, if the pump deliversQ = 30US gallon/min water from a closed tank, where the pressure (above thewater level) is p = 40kPa. The equivalent length of the smoothened concretepipe on the suction side is 12m while the suction flange of the pump is 8m belowthe water level. The vapour pressure at the given water temperature is 2.8kPa.The required net positive suction head is NPSHr = 3.2m. Please show complete formulas and units being cancelled.
The pump has to draw 0.7 m/s flow to the pipe at an elevation of 10 m where a pressurep = -88.29 kPa gage prevails. A head loss h̟ = 0.5 V²/2g assumed, where V is the velocity in the discharge pipe. If the pump efficiency is 70%, how much power has to be drawn from the national gridline? p=-88.20 KPa gage Elevation = 10 m - D= 30 cm Elevation = 6 m 40 cm diameter Water T= 10-C Elevation = 2 m O P, = 24.52 kW O Pp = 83.39 kW O Pp = 63.77 kW O All other answers are wrong
7-4 A pump must raise 2 m/min a vertical distance of 30 m. If the discharge and suction pipe are 200 mm in diameter and 275 m long, determine the total head against which the pump must act. Neglect minor losses.
Water is pumped from reservoir A at elev. 30m through 1200m of 600mm pipe to reservoir B at elevation 90m. The pump is close to reservoir A and at the same elevation as A. A hydraulic motor is placed in the pipeline at a point midway on the length of pipe, and at elevation 80m. The motor delivers 51hp and is 70% efficient. With water delivery of 980 liters/sec, what will be the power output of the pump? What will be the pressure at entrance to and exit from the motor? Assume f = 0.022.
Calculate the required pipe diameter to avoid cavitation, if the pump deliversQ = 30US gallon/min water from a closed tank, where the pressure (above thewater level) is p = 40kPa. The equivalent length of the smoothened concretepipe on the suction side is 12m while the suction flange of the pump is 8m belowthe water level. The vapour pressure at the given water temperature is 2.8kPa.The required net positive suction head is NPSHr = 3.2m. Show the complete solution and units being cancelled.
For water supply of a town, water is pumped from a river 4km away into a reservoir. The maximum level difference of river and reservoir is 20m. Town population is 50,000 and per capita water demand is 120 lpcd. If the pumps operate for a total of 8hrs and pump efficiency is 60%, calculate pump B.H.P Assume friction factor as 0.0075 and pipe velocity as 2m/s and maximum daily demand as 1.6 times avg. daily demand.
10. A fire pump delivers water through a 300 mm main hydrant to which is connected a cotton rubber-lined fire base 100 mm in diameter terminating in a 25 mm diameter nozzle (Cv = 0.98) .Assuming friction lost in 300 mm pipe is 3.1 m, 2.5 m from the 100 mm , and 0.8 m from the reservoir to the pump. A) Compute the added energy produce by the pump if it delivers 20 L/s B) If the jet of the nozzle is thrown vertically, what is the maximum height that the water can reach? C) What is the pressure at the pump? EL 70 m 300 mm EL 5 m 100 mm hydrant EL 20 m 25 mm nozzle) El 22 m
8-42E Water at 60°F passes through 0.75-in-internal- diameter copper tubes at a rate of 1.2 lbm/s. Determine the pumping power per ft of pipe length required to maintain this flow at the specified rate.
pump discharges 1129.52 kg/min of water to a vertical tank (10ft dia by 15 ft height). Find the total time (in min) the tank will be 3/4 full.
90 dm diameter pipe, and a pressure of 200 kPa maintained at the summit, where the pipe is 90 m above 3.0 J/N between the reservoir and the summit. If the pump is 90% efficient, what is the input powe the reservoir. The flow is 1.40 m'/s with a head loss of Water from a reservoir is pumped over a hill thro 4. furnished to the water?

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