1. What is the Pump Horsepower Formula?

The pump horsepower formula calculates the required horsepower for a pump based on flow rate (GPM) and head (ft). This calculation helps determine the appropriate pump size and motor requirements for fluid handling systems.

2. How Does the Calculator Work?

The calculator uses the pump horsepower formula:

Where:

• \( GPM \) — Flow rate in gallons per minute
• \( Head \) — Total dynamic head in feet
• 3960 — Conversion constant

Explanation: This formula converts the hydraulic power (flow rate × head) to mechanical horsepower, accounting for the conversion factors between different units of measurement.

3. Importance of Pump Horsepower Calculation

Details: Accurate horsepower calculation is essential for proper pump selection, ensuring efficient operation, preventing motor overload, and optimizing energy consumption in pumping systems.

4. Using the Calculator

Tips: Enter flow rate in GPM and head in feet. Both values must be positive numbers. The calculator will compute the required horsepower for the pump.

5. Frequently Asked Questions (FAQ)

Q1: What does the 3960 constant represent?
A: The constant 3960 converts (GPM × ft-head) to horsepower, accounting for the density of water and unit conversions.

Q2: Is this formula specific to water pumping?
A: Yes, this formula is designed for water or fluids with similar density to water. For other fluids, additional density corrections are needed.

Q3: Does this include pump efficiency?
A: No, this calculates hydraulic horsepower. To get brake horsepower, you need to divide by pump efficiency.

Q4: What is considered a typical head value?
A: Head values vary widely depending on the application, from 10-20 ft for circulation pumps to several hundred feet for high-pressure applications.

Q5: Can this calculator be used for all pump types?
A: This formula applies to centrifugal pumps. Positive displacement pumps may require different calculations.