1. What is the Pump Power Formula?

The pump power formula calculates the required horsepower for a pump motor based on flow rate, head, fluid properties, and pump efficiency. This is essential for proper pump selection and energy-efficient operation.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

• \( Flow Rate \) — Gallons per minute (GPM)
• \( Head \) — Total dynamic head in feet
• \( Specific Gravity \) — Density relative to water (1.0 for water)
• \( Efficiency \) — Pump efficiency as decimal (0.0-1.0)
• 3960 — Conversion factor (ft-lb/min per HP)

Explanation: The equation calculates the theoretical power required to move fluid against system resistance, adjusted for pump efficiency.

3. Importance of Proper Pump Sizing

Details: Correct pump sizing ensures energy efficiency, prevents motor overload, reduces maintenance costs, and extends equipment life. Oversized pumps waste energy while undersized pumps can't meet system demands.

4. Using the Calculator

Tips: Enter flow rate in GPM, head in feet, specific gravity (1.0 for water), and pump efficiency as decimal (typically 0.7-0.9). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is total dynamic head?
A: It's the total resistance the pump must overcome, including static head, friction loss, and pressure differences.

Q2: Why is efficiency important?
A: Pump efficiency accounts for energy losses in the system. Higher efficiency means less power required for the same output.

Q3: Should I add a safety factor?
A: Typically add 10-20% to the calculated power to account for system variations and future demands.

Q4: How does viscosity affect power?
A: High viscosity fluids require more power. The calculator assumes Newtonian fluids; non-Newtonian fluids need special consideration.

Q5: What about motor service factor?
A: Standard motors have 1.15 service factor. Never size a pump to continuously operate above motor nameplate rating.