1. What is a Centrifugal Pump Power Calculator?

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

Purpose: It helps engineers and technicians determine the appropriate pump size and power requirements for fluid 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 (dimensionless, 0-1)

Explanation: The formula calculates the hydraulic power required to move the fluid, adjusted for pump efficiency.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump selection, energy efficiency, and system reliability.

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 have efficiencies between 0.5 and 0.9, with 0.75 being a common average.

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

Q4: What density should I use for other fluids?
A: For other fluids, use their specific weight divided by 7.48 (gallons per cubic foot).

Q5: Does this include motor efficiency?
A: No, this calculates hydraulic power. For electrical input power, divide by motor efficiency.