1. What is Centrifugal Pump Power Formula?

The centrifugal pump power formula calculates the power required by a pump to move fluid through a system. It accounts for fluid density, flow rate, head (pressure), and pump efficiency.

2. How Does the Calculator Work?

The calculator uses the pump power equation:

Where:

• \( P \) — Pump power (W)
• \( \rho \) — Fluid density (kg/m³)
• \( g \) — Gravitational acceleration (9.81 m/s²)
• \( Q \) — Volumetric flow rate (m³/s)
• \( H \) — Head (m)
• \( \eta \) — Pump efficiency (0 to 1)

Explanation: The formula calculates the hydraulic power divided by the pump efficiency to determine the actual power requirement.

3. Importance of Pump Power Calculation

Details: Accurate pump power calculation is essential for proper pump selection, energy efficiency assessment, and system design. It helps determine motor sizing and operating costs.

4. Using the Calculator

Tips:

• For water at 20°C, use density ≈ 998 kg/m³
• Typical pump efficiencies range from 0.7 to 0.9
• Convert flow rates from L/s to m³/s by dividing by 1000
• All values must be positive numbers

5. Frequently Asked Questions (FAQ)

Q1: What is pump head (H)?
A: Pump head is the height to which the pump can raise the fluid, expressed in meters of fluid column. It represents the energy imparted to the fluid.

Q2: How does density affect pump power?
A: Power is directly proportional to fluid density. More power is required to pump denser fluids at the same flow rate and head.

Q3: What is typical pump efficiency?
A: Centrifugal pumps typically have efficiencies between 70-90%. Larger pumps tend to be more efficient than smaller ones.

Q4: How to convert power to horsepower?
A: Divide the power in watts by 746 to get horsepower (1 HP = 746 W).

Q5: Why is efficiency important?
A: Efficiency accounts for energy losses in the pump. Higher efficiency means less energy is wasted as heat and vibration.