Pump Capacity vs Speed and Diameter (\( \frac{q1}{q2} = \left(\frac{N1}{N2}\right) \left(\frac{D1^3}{D2^3}\right) \)):

Where:

• \( q1 \) is the initial pump capacity, in gpm.
• \( q2 \) is the final pump capacity, in gpm.
• \( N1 \) is the initial pump speed, in rpm.
• \( N2 \) is the final pump speed, in rpm.
• \( D1 \) is the initial pump diameter, in inches.
• \( D2 \) is the final pump diameter, in inches.