Pump Speed vs Power ($\frac{N1^3}{N2^3} = \frac{Hp1}{Hp2}$):

Where:

• $N1$ is the initial pump speed, in revolutions per minute (rpm).
• $N2$ is the final pump speed, in revolutions per minute (rpm).
• $Hp1$ is the initial pump power, in horsepower (hp).
• $Hp2$ is the final pump power, in horsepower (hp).