1. What is Centrifugal Pump Power Calculation?

Definition: This calculator determines the power required by a centrifugal pump based on flow rate, total head, fluid density, and pump efficiency.

Purpose: It helps engineers and technicians properly size pumps and motors for fluid handling systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Pump power (horsepower)
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Total head (feet)
• \( \rho \) — Fluid density (pounds per gallon)
• \( \eta \) — Pump efficiency (decimal, 0-1)

Explanation: The formula calculates the hydraulic power needed to move the fluid and divides by pump efficiency to determine actual power requirement.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump selection, prevents motor overload, and optimizes energy consumption.

4. Using the Calculator

Tips: Enter the flow rate in GPM, total head in feet, fluid density (default 8.34 lb/gal for water), and pump efficiency (default 0.75). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the 3960 constant in the formula?
A: It's a conversion factor that combines unit conversions to give the result in horsepower.

Q2: What's a typical pump efficiency value?
A: Centrifugal pumps typically range from 50-85% efficiency (0.5-0.85), with 75% being a common default.

Q3: How do I determine total head?
A: Total head is the sum of static head, friction losses, and pressure head in the system.

Q4: What if my fluid isn't water?
A: Adjust the density value accordingly (e.g., 6.6 lb/gal for gasoline, 10 lb/gal for brine).

Q5: Should I add a safety factor?
A: Yes, it's common practice to multiply the calculated power by 1.1-1.2 for safety margin.