1. What is a Hydraulic Pump Flow Rate Calculator?

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

Purpose: It helps hydraulic system designers, maintenance technicians, and engineers determine pump performance and system requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( RPM \) — Pump 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 the pump moves per minute based on its rotational speed and displacement per revolution.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate calculation is essential for proper system design, component selection, and troubleshooting hydraulic systems.

4. Using the Calculator

Tips: Enter the pump RPM and displacement (in³/rev). Both values must be > 0. The result will be in gallons per minute (GPM).

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 the conversion factor?
A: There are 231 cubic inches in a US gallon, which converts the displacement volume to gallons.

Q2: What's a typical displacement for hydraulic pumps?
A: Displacement varies widely, 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 is theoretical flow. Actual flow would be less due to volumetric efficiency (typically 85-95% for good pumps).

Q4: How do I find my pump's displacement?
A: Check manufacturer specifications or pump nameplate. For gear pumps, displacement ≈ (gear width × tooth height × circumference).

Q5: What if my pump speed varies?
A: Use the calculator with your minimum and maximum expected RPMs to determine flow range.