1. What is Positive Displacement Pump Flow Calculation?

Positive displacement pumps move fluid by trapping a fixed amount and forcing it into the discharge pipe. The flow rate calculation is essential for determining pump performance and system requirements.

2. How Does the Calculator Work?

The calculator uses the positive displacement pump flow equation:

Where:

• \( Q \) — Flow rate (GPM)
• \( Disp \) — Pump displacement per revolution (in³/rev)
• \( RPM \) — Pump speed (revolutions per minute)

Explanation: The equation calculates the theoretical flow rate based on the pump's displacement per revolution and its operating speed.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is crucial for system design, pump selection, and ensuring proper operation of hydraulic systems and fluid transfer applications.

4. Using the Calculator

Tips: Enter pump displacement in cubic inches per revolution and pump speed in RPM. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is pump displacement?
A: Pump displacement is the volume of fluid moved per revolution of the pump shaft, typically measured in cubic inches per revolution (in³/rev).

Q2: Is this the actual or theoretical flow rate?
A: This calculation provides the theoretical flow rate. Actual flow may be slightly less due to factors like slippage, viscosity, and system pressure.

Q3: Can this calculator be used for all positive displacement pumps?
A: Yes, the formula applies to all types of positive displacement pumps including gear, piston, vane, and screw pumps.

Q4: How does viscosity affect the flow rate?
A: Higher viscosity fluids may reduce actual flow rate due to increased internal leakage and higher pressure requirements.

Q5: What units are used in this calculation?
A: This calculator uses imperial units: displacement in in³/rev and flow rate in GPM. For metric units, conversion factors would be needed.