1. What is Pump Flow Rate Calculation?

Definition: This calculator determines the volumetric flow rate of a positive displacement pump based on its mechanical specifications.

Purpose: It helps engineers and technicians size pumps, design hydraulic systems, and verify pump performance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (m³/s)
• \( Displacement \) — Pump displacement per revolution (m³/rev)
• \( RPM \) — Rotational speed (revolutions per minute)
• \( Efficiency \) — Volumetric efficiency (0-1)

Explanation: The displacement multiplied by RPM gives theoretical flow, which is then adjusted by efficiency to get actual flow.

3. Importance of Pump Flow Calculation

Details: Accurate flow rate calculation ensures proper system design, prevents pump oversizing/undersizing, and helps optimize energy usage.

4. Using the Calculator

Tips: Enter the pump's displacement per revolution, operating RPM, and volumetric efficiency (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is pump displacement?
A: The volume of fluid displaced per one complete revolution of the pump's input shaft.

Q2: How do I find my pump's displacement?
A: Typically provided in manufacturer specifications, or calculated from pump geometry.

Q3: What affects pump efficiency?
A: Factors include internal leakage, fluid viscosity, pressure, and mechanical wear.

Q4: Why convert RPM to rev/sec?
A: The formula requires consistent units - displacement is per revolution and flow is per second.

Q5: Can I use this for centrifugal pumps?
A: No, this formula is specific to positive displacement pumps only.