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A self-priming centrifugal pump is used to pump water at 25°c from a reservoir whose surface is 2.2 m below the centerline of the pump inlet (Fig. P14-60). The pipe is PVC pipe with an ID of 24.0 mm and negligible average inner roughness height. The pipe length from the submerged pipe inlet to the pump inlet is 2.8 m. There are only two minor losses in the piping system from the pipe inlet to the pump inlet: a sharp-edged reentrant inlet (KL = 0.85), and a flanged smooth 900 regular elbow (KL = 0.3). The pump's required net positive suction head is provided by the manufacturer as a curve fit:
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FLUID MECHANICS FUNDAMENTALS+APPS
- The centrifugal pump in the figure pumps the water at 25°C from the tank 1.22 m above its inlet center. The inner diameter of the suction pipe is 101.6 mm, the coefficient of friction is 0.0306 and the length is 3.2 m. The sum of the local loss coefficients of the elements in this pipe is 7.4. If the pump operates at a flow rate of 109 m3/h, ENPY=1.52 m. Does the pump work without cavitation at this flow rate? Show the calculation. For water, p-997 kg/m3 and Pb-3.169 kPa. Patm=101.3 kPa and a2-1.05. Depo 80.a Girişteki borulama Pompa sistemi Vana m Ya9arrow_forwardpleasearrow_forward2. A centrifugal pump having an overall efficiency of 75% is discharging 30 litres of waler per second througha pipe of 150 mm diameter and 125 m long. Calculate the power required to drive the pump, if the water is lifted through a height of 25 metres. Take coefficient of friction as 0-01. (Ans. 11-7kW)arrow_forward
- Q: Select duct sizes for the rectangular duct system shown in the Figure, using the equal friction method. The total pressure available for the duct system is 0.12 in. wg (30 Pa), and the loss in total pressure for each diffuser at the specified flow rate is 0.02 in. wg (5 Pa). Assume the velocity in mean duct 600 fpm. 25 ft (8 m) 150 cfm (0.071 m/s) Plenum Boots are round (2) 5 ft to rectangular. 20 ft (6 m) 15 ft (4.6 m) (1.5 m) (1.5 m) 200 cfm 5 ft 150 cfm 5 ft (0.095 m/s) (0.071 m/s) (1.5 m) 5 ft (1.5 m) E (1.5 m)arrow_forwardFor the hydraulic system of Figure, the following data are given: The pump is adding2.984kW to the fluid.(a) Pump flow is 0.00158 m3. (b) The pipe inside diameter is 0.01905m.(c) The specific gravity of the oil is 0.9.(d) The oil tank is vented to the atmosphere.(e) The head loss HL between station 1 and 2 is 12.19m.(f) The elevation difference between stations 1 and 2 is 6.096m.Find the pressure available at the inlet to the hydraulic motor(station 2).arrow_forwarda pumping station working with a pump head of 25m. the output power of the motor for that pump is 16kw. identify the pump efficiency if the sewarge discharge velocity is 0.27 m/s and the pipe diameter is 250 mmarrow_forward
- Friction Losses and Pump Horsepower Problem:Hot water in an open storage tank at 82.2°C is being pumped at the rate of 0.379 m3/min from this storage tank. The line from the storage tank to the pump sunction is 6.1m of 2-in. schedule 40 steel pipe and it contains three elbows. The discharge line after the pump is 61 m of 2-in. pipe and contains two elbows. The water discharges to the atmosphere at a height of 6.1 m above the water level in storage tank. a. Calculate all frictional losses ƩF. b. Make a mechanical-energy balance and calculate Ws of the pump in J/kg. c. What is the kW power of the pump if its efficiency is 75%?arrow_forwardQuestion 2) The centrifugal pump in the figure is in his preference Passing water at 25°C from the tank through the 1.22 m exchange store pumping. Inner diameter of the suction channel is 101.6 mm, in total it is 0.0306 and its length is 3.2 m. It the local coefficients of the user in the pipe are 7.4. If the pump works at a flow rate of 109 m3/h ENPY=1.52 is m. Does the pump work without cavitation at this flow? Show the calculation. For water, p=997 kg/m3 and Pb=3.169 kPa. Piping system at the entrance (Suction pipe) pump 22 Patm=101.3 kPa and 0.2=1.05. vanarrow_forwardOil is being pumped from an Open Tank A (elev = 110m) to another Open Tank B (elev = 220m) with a total head loss of 15m of Oil. The pump has a power rating of 210kW and an efficiency of 65%. Pipe 1 (D = 200mm) connects Tank A and the pump while Pipe 2 (D = 150mm) connects the pump and Tank B. Calculate the pump head, velocity of flow in Pipe 1, mass flowrate in Pipe 2, power output of the pump and volumetric flowrate of oil.arrow_forward
- In the figure below, assume the pipe from B to C has a diameter of 4-inches, (f = 0.035), and length of 18-feet. The pipe from DE is 187-feet, has a diameter of 4-inches and friction factor of 0.035. The Az = 69-feet. The elevation of C is 14-feet above the lower water surface. If the pressure head @ C is to be no less than (-) 20 feet, and the pump has 63% efficiency, what horsepower must be supplied to the pump in order to convey flow through the system? (Kent = 0.8) Assume a submerged exit. Azarrow_forwardThe distribution system requires to lift water to an area with an average elevation of 90 mamsl from the pumping station at 35 mamsl. The area has a demand requirement of 30 MLD and the minimum pressure head requirement is 20 m-head. The pipe which will serve the area is 500 mm with C-value of 90 and length of 3000 m. Determine the following: a) total head loss along the pipe in meter, b) the head of pump required in meter, and c) the power required by the pump with an efficiency of 80% in kilowatt. Note: Theaverage water surface level of the reservoir which supports the pumping station is 5 m.arrow_forwardPUMP SYSTEM – SYSTEM CURVE AND NPSH The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m3/h. SUCTION PIPE Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m3/h starting at 0 (7-point curve) 2. Would you advise the client to select the p400 or ¢460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: the gauge pressure in the suction tank at 115 kPa, the vapour pressure of the water at its average operating temperature at 20C suction height as 1.5 m. 3. Is the pump likely to cavitate? Support…arrow_forward
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