1. What is a Diaphragm Pump Flow Rate Calculator?

Definition: This calculator estimates the flow rate of a diaphragm pump in gallons per minute (GPM) based on the pump's RPM and displacement volume.

Purpose: It helps engineers, technicians, and maintenance personnel determine the expected flow rate of diaphragm pumps for system design and troubleshooting.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( RPM \) — Pump speed (revolutions per minute)
• \( V_d \) — Displacement volume (cubic inches per revolution)
• 231 — Conversion factor (cubic inches per gallon)

Explanation: The pump's speed multiplied by its displacement volume gives the total volume pumped per minute, which is then converted to gallons.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper system performance, helps select appropriate pumps, and verifies pump operation meets design requirements.

4. Using the Calculator

Tips: Enter the pump's operating RPM and its displacement volume per revolution in cubic inches. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is displacement volume?
A: Displacement volume is the volume of fluid moved by the pump in one complete revolution, typically provided by the manufacturer.

Q2: Why 231 in the formula?
A: 231 cubic inches equals 1 US gallon, which converts the volume from cubic inches to gallons.

Q3: Is this the actual flow rate I'll get?
A: This calculates theoretical flow. Actual flow may be less due to factors like slippage, viscosity, and system backpressure.

Q4: Does this work for all pump types?
A: This formula is specific to positive displacement pumps like diaphragm pumps. Centrifugal pumps use different calculations.

Q5: How do I find my pump's displacement volume?
A: Check manufacturer specifications or calculate it from pump geometry (for diaphragm pumps: displacement area × stroke length × 2 for double-acting).