When two indentical certifugal pumps are operating in series on a common rising main, then

- 1
  
  the pressure in the rising main will be nearly doubled, while the discharge will remain the same
- 2
  
  the discharge will be nearly double, while the pressure remains the same
- 3
  
  discharge as well as the pressure in the rising main will be doubled
- 4
  
  discharge as well as the pressure in the rising main will increase but not becore double

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