1. What is a Hydraulic Pump Flow Rate Calculator?

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

Purpose: It helps hydraulic system designers, maintenance technicians, and engineers properly size and evaluate hydraulic pumps.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula calculates how much fluid volume the pump moves per minute based on its mechanical displacement and speed.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation ensures proper system performance, prevents pump overload, and helps select appropriate components.

4. Using the Calculator

Tips: Enter the pump RPM and displacement (in cubic inches per revolution). Both values must be greater than 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 displacement volume to gallons per minute.

Q2: What's a typical displacement for hydraulic pumps?
A: Common displacements range from 0.1 in³/rev for small pumps to 10+ in³/rev for large industrial pumps.

Q3: Does this account for pump efficiency?
A: No, this calculates theoretical flow. For actual flow, multiply by the pump's volumetric efficiency (typically 85-95%).

Q4: How does RPM affect flow rate?
A: Flow is directly proportional to RPM - doubling the RPM doubles the flow (assuming constant displacement).

Q5: Can I use this for hydraulic motors?
A: Yes, the same formula applies to hydraulic motors, calculating the theoretical flow required to achieve a certain speed.