Why is motor impeller rotation so critical for 3-phase centrifugal pumps? Select the best answer Wastewater could backwash into the potable water supply Impellers spinning in the wrong direction will create a vacuum in the line Pumping efficiency plummets when the impeller spins in the wrong direction It can indicate if the power is in the wrong phase
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- Which of the following best describes a Venturi Meter? an opening having a closed perimeter in a wall or partition used for measuring flow of fluids are flow measurement instruments which use a converging section of pipe it can be used to measure fluid flow velocity by converting Kinetic Energy to Potential an opening in a dam or other Ohydraulic structure to control the passage of water Trapezoidal weir with side slope of 1 horizontal to 4 vertical Suttro Weir V-Notch Weir Cipoletti Weir Contracted WeirWater at 50°F is pumped from a lake at 750 gpm through a length of 3-inch schedule 40 commercial steel pipe as shown below. The inlet to the pipe is eight feet below the surface of the lake. A 25-HP gasoline engine drives the pump and the pump has an efficiency of 80% What is the Reynolds number in the pipe? Is the flow laminar or turbulent? What is the head added to the water by the pump? What is the head loss due to pipe friction?a A jet ef weter Frawm a 25 mm diameter nozzle is directed vertically upwards. Assuming that the jet remalns circular and neglecting any less of energ that will be the diameterata point 4.5m above the nozzle,ifthe velecity with which the jest leaves the nozzle is 12 /s? A jet af water 4.5m nozzle Raghad Sam
- Home Work Example: For the system shown in Figure calculate the height H of the oil at which the rectangular hinged gate will just begin to rotate anticlockwise. Oil (Sp.gr. -0.8) Hinge 236 Air Gate 1.5m 30 kPa Gate: 0.6 wide HA pump lifts 60°F water from a stream to a reservoir whose surface is an unknown distance above the free surface of the stream. The suction pipe (from the stream to the pump) is 250 ft of 8-in Schedule 40 steel pipe, while the discharge pipe (from the pump to the reservoir) is 2250 ft of 8-in Schedule 40 PVC (plastic) pipe. The pump consumes 150 hp and has an estimated efficiency of 85%. The suction inlet of the pump is located 2.5 ft below the surface of the stream, while the discharge port of the pump is located at the same elevation as the surface of the stream. A differential manometer connected to the suction and discharge sides of the pump measures a pressure difference of 128 psi. Consider the friction loss in the piping (using the Darcy-Weisbach equation), but neglect other (minor) losses. Flow Reservoir Pump 2.5 ft StreamThe centrifugal pump has to work with the following specifications: Static suction head: 3 m Static delivery head: 8 m Length of suction pipe: 7m Length of delivery pipe: 10 m Discharge: 850 lpm Working fluid: Water at 30°C A3 The pump is directly connected to an electric motor. Design the pump completely for pumping water.
- pg - Photos c. 2402.40 hp d. 8504.04 hp tuation XVIII: A 25 mm long smooth brass pipe 300 m long drains an open 1.2 m cylindrical tank which contains oil having density 950 kg/m^3 and dynamic viscosity of 0.03 N.s/m^2. The pipe discharges at elevation 30 m. The liquid surface of oil is at elevation of 36 m. 46. Find Reynolds Number for oil? a. 88.4 b. 96.1 C. 112.7 d. 144.8 47. Determine the velocity of flow a. 0.1174 m/s b. 0.1488 m/s C. 0.1213 m/s d. 0.1459 m/s 48. Determine the time required in hours for the oil level to drop from elevation 36 to elevation 32.5 m. a. 29.6 hours b. 20.4 hours C. 22.9 hours d. 27.7 hours 10:30 P May. 09,[CE Hydraulics] 3. In a pipeline with converging diameter, will the gradient of the total energy line be steeper or milder than the gradient of the piezometric head line? Why?How can we calculate compressor power in a pulsejet baghouse?
- The Best Efficiency Point is the point in a pump curve that coincides with its maximum flow rate. True False노키 10ptis L₂ follft 다 0.1 ft 1 Visioft/s Figure 1EXAMPLE 14–2 Selection of Pump Impeller Size A washing operation at a power plant requires 370 gallons per minute (gpm) of water. The required net head is about 24 ft at this flow rate. A newly hired engineer looks through some catalogs and decides to purchase the 8.25-in impeller option of the Taco Model 4013 FI Series centrifugal pump of Fig. 14-15. If the pump operates at 1160 rpm, as specified in the per- formance plot, she reasons, its performance curve intersects 370 gpm at H = 24 ft. The chief engineer, who is very concerned about efficiency, glances at the performance curves and notes that the efficiency of this pump at this operating point is only 70 percent. He sees that the 12.75-in impel- ler option achieves a higher efficiency (about 76.5 percent) at the same flow rate. He notes that a throttle valve can be installed downstream of the pump to increase the required net head so that the pump operates at this higher efficiency. He asks the junior engineer to justify her…