1. What is the Pump Capacity Formula?

The Pump Capacity Formula calculates the flow rate (Q) of a centrifugal pump based on impeller diameter, rotational speed, and head. It's fundamental for designing and selecting pumps for various applications.

2. How Does the Calculator Work?

The calculator uses the pump capacity formula:

Where:

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

Explanation: The formula relates the pump's physical characteristics to its output flow rate, accounting for the impeller's size, speed, and the pressure head it generates.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper pump selection, system design, and ensuring the pump meets the required performance specifications for a given application.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for centrifugal pump flow rates?
A: Flow rates can vary from less than 1 m³/h for small pumps to over 50,000 m³/h for large industrial pumps.

Q2: How does impeller diameter affect flow rate?
A: Flow rate is proportional to the square of the impeller diameter, so small changes in diameter can significantly impact flow.

Q3: What is "head" in pump terminology?
A: Head refers to the height of a liquid column that the pump can create from the kinetic energy it imparts to the liquid.

Q4: Are there limitations to this formula?
A: This is a simplified formula. Actual pump performance also depends on efficiency, viscosity, and system characteristics.

Q5: How can I convert the flow rate to other units?
A: 1 m³/s = 1000 L/s = 3600 m³/h. Use appropriate conversion factors for your needs.