Question: A pump is to deliver 80 gpm of water at 140F with a discharge pressure of 158 psig. Suction pressure indicates 2 inches of mercury

A pump is to deliver 80 gpm of water at 140F with a discharge pressure of 158 psig. Suction pressure indicates 2 inches of mercury vacuum. The diameters of the suction and discharge pipes are five (5) inches and four (4) inches, respectively. The pump has an efficiency of 70%, while the motor efficiency is 80%. 

Determine: 

  1. Water horsepower of the pump 
  2. Brake horsepower of the pump 
  3. Power input to drive motor 
  4. Combined motor-pump efficiency

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Given Water discharge rate Q 80 gpm Temperaure 140 F Discharge pressure p d 158 psig Suction ... View full answer

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