1. What is Centrifugal Pump Flow Rate?

The centrifugal pump flow rate (Q) represents the volume of fluid moved by the pump per unit time. It's a critical parameter in pump selection and system design, determining how much fluid the pump can deliver at given operating conditions.

2. How Does the Calculator Work?

The calculator uses the fundamental centrifugal pump equation:

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 equation relates the pump's physical characteristics and operating conditions to its output flow rate, accounting for the energy imparted to the fluid.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper pump selection, system design, and performance evaluation. It helps ensure the pump meets the system requirements without over- or under-sizing.

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 pump head (H)?
A: Pump head is the height to which the pump can raise the fluid against gravity, expressed in meters of fluid column.

Q2: How does impeller diameter affect flow rate?
A: Flow rate increases with the square of impeller diameter - doubling the diameter quadruples the flow rate (all else being equal).

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

Q4: Does this equation account for efficiency losses?
A: No, this is the theoretical flow rate. Actual flow will be lower due to hydraulic losses, leakage, and other inefficiencies.

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