1. What is Centrifugal Pump Flow Rate Calculation?

Definition: This calculator estimates the flow rate of a centrifugal pump based on horsepower, efficiency, total dynamic head, and fluid density.

Purpose: It helps engineers and technicians determine the expected performance of centrifugal pumps in various applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute, GPM)
• \( HP \) — Pump horsepower
• \( \eta \) — Pump efficiency (dimensionless, 0-1)
• \( H \) — Total dynamic head (feet)
• \( \rho \) — Fluid density (pounds per gallon)

Explanation: The formula relates the pump's power input to its fluid output, accounting for system resistance (head) and fluid properties.

3. Importance of Pump Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper pump selection, system design, and energy efficiency in fluid transport systems.

4. Using the Calculator

Tips: Enter the pump horsepower (HP), efficiency (typically 0.6-0.9), total dynamic head in feet, and fluid density (8.34 lb/gal for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the constant 3960 in the formula?
A: This is a conversion factor that relates horsepower, flow rate, head, and specific gravity in consistent units.

Q2: What's a typical pump efficiency value?
A: Centrifugal pumps typically have efficiencies between 60-90% (0.6-0.9), depending on size and design.

Q3: How do I determine total dynamic head?
A: TDH is the sum of static head, friction losses, and pressure head in the system.

Q4: What density should I use for water?
A: Pure water at 60°F has a density of 8.34 lb/gal. Adjust for temperature or other fluids.

Q5: Can this formula be used for other pump types?
A: This is specific to centrifugal pumps. Positive displacement pumps use different calculations.