1. What is the Pump Capacity Formula?

The pump capacity formula calculates the volumetric flow rate of a pump based on its physical characteristics and operating conditions. It's fundamental in hydraulic engineering for pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the pump capacity equation:

Where:

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

Explanation: The equation relates the pump's physical dimensions and operating speed to its theoretical maximum flow capacity under given head conditions.

3. Importance of Pump Capacity Calculation

Details: Accurate pump capacity calculation is essential for proper system design, ensuring the pump can meet flow requirements while operating efficiently within its performance curve.

4. Using the Calculator

Tips: Enter 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's the difference between theoretical and actual pump capacity?
A: The formula gives theoretical capacity. Actual capacity is lower due to factors like mechanical losses, fluid viscosity, and system resistance.

Q2: How does head affect pump capacity?
A: Higher head generally reduces flow rate as the pump works against greater resistance. The exact relationship depends on the pump's performance curve.

Q3: What are typical flow rate units?
A: While m³/s is standard, other common units include liters/second, gallons/minute (GPM), or cubic meters/hour (m³/h).

Q4: Does this formula work for all pump types?
A: This is most accurate for centrifugal pumps. Positive displacement pumps require different calculations.

Q5: How important is impeller diameter?
A: Extremely important - flow rate is proportional to the square of the diameter, making it one of the most influential factors.