1. What is Pump Motor Power?

The pump motor power is the mechanical power required to move a fluid at a specified flow rate against a specific head (pressure). It depends on the fluid properties and pump efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power formula:

Where:

• \( P \) — Power (kW)
• \( Q \) — Flow rate (m³/h)
• \( H \) — Head (meters)
• \( \rho \) — Density (kg/m³)
• \( g \) — Gravity (9.81 m/s²)
• \( \eta \) — Pump efficiency (0-1)

Explanation: The formula calculates the theoretical power required to move the fluid, then divides by pump efficiency to get actual motor power needed.

3. Importance of Power Calculation

Details: Proper power calculation ensures the motor is correctly sized - too small will fail, too large is inefficient and costly. It's essential for system design and energy efficiency.

4. Using the Calculator

Tips: Enter flow rate in m³/h, head in meters, fluid density in kg/m³ (1000 for water), and pump efficiency as decimal (0.8 for 80%). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What's typical pump efficiency?
A: Centrifugal pumps typically range 60-85%. Positive displacement pumps can reach 90%. Always check manufacturer data.

Q2: How to account for motor efficiency?
A: This calculates hydraulic power. Divide result by motor efficiency (typically 0.9-0.95) for electrical input power.

Q3: What if my fluid viscosity is high?
A: High viscosity reduces pump efficiency. Use viscosity correction charts or consult manufacturer.

Q4: How does head relate to pressure?
A: Head (m) = Pressure (Pa) / (ρ × g). 10m water head ≈ 1 bar pressure.

Q5: What safety factor should I add?
A: Typically add 10-20% to calculated power for safety margin and future needs.