1. What is RPM to Volumetric Flow Rate Calculator?

Definition: This calculator converts rotational speed (RPM) to volumetric flow rate (GPM) based on the pump's displacement per revolution.

Purpose: It helps hydraulic engineers and technicians determine the flow rate of pumps in hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Volumetric flow rate (gallons per minute)
• \( RPM \) — Rotational speed (revolutions per minute)
• \( D_p \) — Pump displacement per revolution (cubic inches per revolution)
• \( 231 \) — Conversion factor (cubic inches per gallon)

Explanation: The formula multiplies RPM by displacement to get cubic inches per minute, then converts to gallons per minute.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation ensures proper system performance, component sizing, and efficiency in hydraulic applications.

4. Using the Calculator

Tips: Enter the pump's RPM and its displacement per revolution (available in pump specifications). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 cubic inches equals 1 US gallon, which converts the units from in³/min to gallons/min.

Q2: Where can I find displacement per revolution?
A: This is typically listed in the pump's technical specifications as "displacement" or "volumetric displacement."

Q3: Does this work for all pump types?
A: This applies to positive displacement pumps (gear, piston, vane pumps). Centrifugal pumps require different calculations.

Q4: How does efficiency affect the calculation?
A: For more accurate results, multiply the result by the pump's volumetric efficiency (typically 0.85-0.95).

Q5: Can I calculate RPM from flow rate?
A: Yes, rearrange the formula: \( RPM = \frac{Q \times 231}{D_p} \).