An oil pump is drawing 18 kW of electric power while pumping oil with density 860 kg/m3 at a rate of 0.1 m3/s. The inlet and outlet diameters of the pipe are 8 cm and 20 cm, respectively. If the pressure rise of oil in the pump is measured to be 250 kPa and the motor efficiency is 95 percent, determine the mechanical efficiency of the pump. Take the kinetic energy correction factor as 1.05. 18 kW Docm Pump Motor 8 сm Oil AP = 250 kPa 0.1 m/s The mechanical efficiency of the pump is |%.
An oil pump is drawing 18 kW of electric power while pumping oil with density 860 kg/m3 at a rate of 0.1 m3/s. The inlet and outlet diameters of the pipe are 8 cm and 20 cm, respectively. If the pressure rise of oil in the pump is measured to be 250 kPa and the motor efficiency is 95 percent, determine the mechanical efficiency of the pump. Take the kinetic energy correction factor as 1.05. 18 kW Docm Pump Motor 8 сm Oil AP = 250 kPa 0.1 m/s The mechanical efficiency of the pump is |%.
Chapter2: Loads On Structures
Section: Chapter Questions
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
Transcribed Image Text:**Problem Statement:**
An oil pump is drawing 18 kW of electric power while pumping oil with a density of 860 kg/m³ at a rate of 0.1 m³/s. The inlet and outlet diameters of the pipe are 8 cm and 20 cm, respectively. If the pressure rise of oil in the pump is measured to be 250 kPa and the motor efficiency is 95 percent, determine the mechanical efficiency of the pump. Take the kinetic energy correction factor as 1.05.
**Diagram Explanation:**
- There is a side view of a pump and motor system.
- To the left is the pump, marked as having an 8 cm diameter inlet.
- Oil is entering the pump at a velocity corresponding to 0.1 m³/s and a density of 860 kg/m³.
- The outlet of the pump has a larger diameter marked as 20 cm.
- A motor is connected to the pump, drawing 18 kW of electric power, and has an efficiency of 95%.
- The pressure rise is indicated as ΔP = 250 kPa.
**Question:**
Calculate the mechanical efficiency of the pump and enter the result in the blank provided (%).
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