Pump Sizing Calculator

Total dynamic head (TDH) is the sum of vertical lift, friction losses in pipes and fittings, and pressure requirements at the discharge point. Measure the vertical distance from water source to discharge point, then add estimated friction losses based on pipe length, diameter, and flow rate.

Brake horsepower (BHP) is the actual power required by the pump impeller. Motor horsepower must be higher to account for motor inefficiencies. Always select a motor with horsepower rating equal to or greater than the calculated motor horsepower requirement.

Higher pump efficiency reduces power consumption and operating costs. A pump operating at 80% efficiency requires 25% more power than one at 85% efficiency for the same output. Modern pumps typically achieve 70-90% efficiency depending on design and operating conditions.

Submersible pumps are ideal for deep wells and applications where the pump must be below water level. Surface pumps work well for shallow applications and offer easier maintenance access. Consider suction lift limitations, installation requirements, and maintenance accessibility when choosing.

Calculate your required flow rate and total head, then use these values to select a pump that operates efficiently at your duty point. Consider future needs, system variations, and pump curve characteristics to ensure optimal performance.

Operating costs depend on power consumption, electricity rates, operating hours, and maintenance requirements. Energy-efficient pumps with proper sizing can significantly reduce long-term costs despite higher initial investment.

Recalculate pump sizing when system requirements change, such as increased flow demands, pipe modifications, or elevation changes. Regular evaluation ensures optimal efficiency and prevents under or over-sizing issues.