1. What is the Centrifugal Pump Flow Rate Formula?

The centrifugal pump flow rate formula calculates the volumetric flow rate of a pump based on its impeller diameter, rotational speed, and head. This fundamental equation helps in pump selection and performance analysis.

2. How Does the Calculator Work?

The calculator uses the centrifugal pump flow rate equation:

Where:

• \( Q \) — Flow rate (m³/s)
• \( D \) — Impeller diameter (m)
• \( n \) — Rotational speed (rev/s)
• \( H \) — Head (m)
• \( g \) — Acceleration due to gravity (9.81 m/s²)

Explanation: The equation relates the pump's physical characteristics to its output, showing how flow rate increases with larger impellers and higher speeds.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper pump selection, system design, energy efficiency, and ensuring the pump meets the required hydraulic demands.

4. Using the Calculator

Tips: Enter impeller diameter in meters, speed in revolutions per second, and head in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is pump head?
A: Pump head is the height to which the pump can raise a column of liquid, expressed in meters of liquid head.

Q2: How does impeller diameter affect flow rate?
A: Flow rate increases with the square of the impeller diameter, making it a highly influential parameter.

Q3: What are typical flow rates for centrifugal pumps?
A: Flow rates vary widely from 0.001 m³/s for small pumps to over 10 m³/s for large industrial pumps.

Q4: Does this formula account for efficiency losses?
A: No, this is the theoretical flow rate. Actual flow rates will be lower due to mechanical and hydraulic losses.

Q5: How does speed affect flow rate?
A: Flow rate is directly proportional to rotational speed, so doubling the speed doubles the flow rate.