1. What is the Pump Power Equation?

The pump power equation calculates the theoretical power required to move a fluid at a specified flow rate against a given head, accounting for the fluid's density and the pump's efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

• \( P \) — Power (W)
• \( \rho \) — Fluid density (kg/m³)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Volumetric flow rate (m³/s)
• \( H \) — Total dynamic head (m)
• \( \eta \) — Pump efficiency (decimal, 0-1)

Explanation: The equation calculates the energy needed to move a volume of fluid against gravity and system resistance, adjusted for pump efficiency.

3. Importance of Pump Power Calculation

Details: Accurate power calculation ensures proper pump selection, prevents under/over-sizing, and helps estimate energy requirements and operating costs.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is total dynamic head?
A: It's the total height the liquid needs to be pumped, including static head, friction losses, and pressure differences.

Q2: How do I convert flow rate from L/s to m³/s?
A: Divide L/s by 1000 (1 m³/s = 1000 L/s).

Q3: What are typical pump efficiencies?
A: Centrifugal pumps typically range from 40-85%, with larger pumps generally more efficient.

Q4: Why is density important?
A: Denser fluids require more power to pump at the same flow rate and head.

Q5: Should I add a safety factor?
A: Yes, it's common to add 10-20% to the calculated power for safety margins and future needs.