1. What is Pump Motor Power Calculation?

The pump motor power calculation determines the required power in kilowatts (kW) for a pump motor based on flow rate, head, fluid density, and pump efficiency. This is essential for proper pump selection and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power formula:

Where:

• \( Q \) — Flow rate (m³/hr)
• \( H \) — Head (meters)
• \( \rho \) — Density (kg/m³)
• \( g \) — Gravity (9.81 m/s²)
• \( Efficiency \) — Pump efficiency (%)

Explanation: The formula calculates the hydraulic power required to move fluid against gravity and friction losses, then divides by pump efficiency to determine actual motor power.

3. Importance of Pump Power Calculation

Details: Accurate pump power calculation ensures proper motor sizing, prevents underpowering or overpowering, optimizes energy consumption, and extends equipment lifespan.

4. Using the Calculator

Tips: Enter flow rate in m³/hr, head in meters, fluid density in kg/m³ (1000 for water), and pump efficiency as percentage. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical pump efficiency?
A: Pump efficiency typically ranges from 50% to 85%, depending on pump type, size, and operating conditions.

Q2: Why is density important?
A: Denser fluids require more power to pump. Water has density of 1000 kg/m³, while oils and chemicals may have different densities.

Q3: What is head in pumping systems?
A: Head represents the total resistance the pump must overcome, including static head, friction losses, and pressure differences.

Q4: Should I add a safety factor?
A: Yes, typically add 10-20% safety factor to the calculated power to account for system variations and future requirements.

Q5: Can this be used for all pump types?
A: This formula works for centrifugal pumps. Positive displacement pumps may require different calculations.