3- The pump of waste water of concentration (1.5 mg/liter) treatment plant system is powered by a (15 kw) electric motor whose efficiency is (90%). The water flow rate of the pump is (50 L/sec).The diameter of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pressure at the inlet and outlet of the pump are measured to be (100 Kpa) and (300 kpa) absolute, respectively. Determine the mechanical efficiency of the pump.

3- The pump of waste water of concentration (1.5 mg/liter) treatment plant system is powered by a (15 kw) electric motor whose efficiency is (90%). The water flow rate of the pump is (50 L/sec).The diameter of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pressure at the inlet and outlet of the pump are measured to be (100 Kpa) and (300 kpa) absolute, respectively. Determine the mechanical efficiency of the pump.

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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3- The pump of waste water of concentration (1.5 mg/liter) treatment plant system is powered by a (15 kw) electric motor whose efficiency is (90%). The water flow rate of the pump is (50 L/sec).The diameter of the inlet and outlet pipes are the same, and the elevation difference across the pump is negligible. If the pressure at the inlet and outlet of the pump are measured to be (100 Kpa) and (300 kpa) absolute, respectively. Determine the mechanical efficiency of the pump.
The allowable Net Positive Suction Head (NPSH) for a pump provided by the manufacturer for a flow of 0.05 m³/s is 3.3 m. The temperature of water is 30°C (vapour pressure head absolute = 0.44 m), atmospheric pressure is 100 kPa absolute and the head loss from the reservoir to pump is 0.3 N-m/N The maximum height of the pump above the suction reservoir is
The allowable Net Positive Sustion Head (NPSH) for a pump provided by the manufacturer for a flow of 0.05 m³/s is 3.3 m. The temperature of water is 30° C (vapour pressure head absolute = 0.44 m), atmosphere pressure is 100 kPa absolute and the head loss from the reservoir to pump is 0.3 N-m/N. Find the maximum height of the pump above the sustion reservoir.
A pump is to deliver 80 GPM of water at a density of 61. 83lb/ft cubed with a discharge pressure of 150 psig. Suction pressure indicates a 2 HG vacuum. The diameter of the suction and the discharge are 5 in. and 4 in. respectively. The pump has an efficiency of 70% while the motor efficiency is 80%. Determine the (a) water horsepower of the pump (b) bhp of pump motor (c) power input to drive the motor.
Q-The allowable net positive suction head (NPSH) for a pump provided by the manufacturer for a flow of 0.05 m³/s is 3.3m. The temperature of water is 30°C (vapour pressure head absolute = 0.44 m), atmospheric pressure is 100 kPa absolute and the head loss from the reservoir to pump is 0.3 N-m/N. Find the maximum height of the pump above the suction reservoir.
The pumping system below is used in a manufacturing process involving glycerin. Find the minimum pump head, E (P), required to prevent contamination of the piping system from reservoir B. the temperature of the glycerin is 60°F. Assume no losses in pipe 2 which connects reservoir B and node A. The check valve only allows flow from reservoir B to node A.
(a) Water at temperature of 20 °C is pumped from a reservoir to a large open surface storage tank through a piping system with diameter of 10 cm as shown in Figure Q1. A pump with pump head rise ha = 32 – 1 × 10°Q²,Q = is m? installed in this system. Besides, the pipe's fitting components installed in this piping system such as tee and long radius 90° elbows are flanged type. The total pipe length for the entire piping system from reservoir to storage tank is 48 m while the pipe length from reservoir to pump suction side is 8 m. The friction factor of the pipe in this system is estimated to be 0.02. The elevation difference between the reservoir and storage tank are estimated to be 18 m. Water at 20°C D= 10 cm 18 m pump Reservoir Figure Q1
Which of the following statements about cavitation is true? O Locating the pump below the water surface in the reservoir may not be necessary for avoiding cavitation in centrifugal pumps. O Cavitation occurs when the discharge through the pump exceeds the pump's limit as the pump cannot provide energy to the flow (i.e., pump head = 0). O When the net positive suction head required (NPSHR) at the pump inlet is too low at the operating discharge of the pump, cavitation may occur. O The Hydraulic Institute indicates that the critical value of the suction specific speed n_ss should be above 8500 to avoid cavitation.
The discharge of a liquid of kinematic viscosity 4 x 10-2 m²/s through a 80 mm diameter pipe is 3200 x 10-4 m³/s. The flow is
... ... Example 5: The water level in a tank is 15 m above the ground. A hose is connected to the bottom of the tank, and the nozzle at the end of the hose is pointed straight up. The tank cover is airtight, and the air pressure above the water surface is 3 atm gage. The system is at sea level. Determine the maximum height to which the water stream could rise 3 atm 15 m h
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N 5)( rat ala SIL O 23-A) An activated sludge system is to be used for treatment of 10000 m/day of municipal wastewater. A rimary clarification, the value of BOD, is 150 mg/l, and it is desired to have not more than 5 mg/l. in. ffluent. Assume that Y- 0.5; K, 0.05/day; and ML.VSS-3000 mg/l; Return sludge concentration 10 ng/L. 0 10 days. Determine: Treatment efficiency and the volumetric organic loading. 3) Microorganism ratio 5) The quantity of sludge that must be wasted each day i 2) Reactor volume and detention time. 4) the recycle ratin