1. What is Motor Power Calculation for Pump?

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

Purpose: It helps engineers and technicians properly size pump motors for various fluid transfer applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_e \) — Motor power (kW)
• \( Q \) — Flow rate (gallons per minute)
• \( H \) — Total head (feet)
• \( \rho \) — Fluid density (pounds per gallon)
• \( \eta \) — Pump efficiency (decimal)

Explanation: The formula calculates the hydraulic power and converts it to motor power, accounting for efficiency and unit conversions.

3. Importance of Proper Motor Sizing

Details: Correct motor sizing ensures efficient operation, prevents overload conditions, and extends equipment lifespan.

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 0.8). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is total head?
A: Total head is the sum of static head, friction head, and pressure head that the pump must overcome.

Q2: Why is efficiency important?
A: Efficiency accounts for energy losses in the pump system. Typical values range from 0.5 to 0.9.

Q3: What density should I use for other fluids?
A: For other fluids, use their specific density (e.g., 6.6 lb/gal for gasoline, 9.3 lb/gal for seawater).

Q4: Can I use this for metric units?
A: No, this calculator uses US customary units. For metric, different conversion factors apply.

Q5: Should I add a safety factor?
A: Yes, it's common practice to multiply the result by 1.1-1.2 to account for system variations.