1. What is a Hydraulic Pump Flow Calculator?

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

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

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 pump's displacement per revolution multiplied by its speed gives the total displacement per minute, which is then converted to gallons.

3. Importance of Flow Rate Calculation

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

4. Using the Calculator

Tips: Enter the pump RPM and displacement (in³/rev). Both values must be > 0. The result shows theoretical flow without considering efficiency losses.

5. Frequently Asked Questions (FAQ)

Q1: What's the 231 constant in the formula?
A: It's the conversion factor from cubic inches to US gallons (1 gallon = 231 cubic inches).

Q2: Is this the actual or theoretical flow rate?
A: This calculates theoretical flow. Actual flow will be less due to pump efficiency and system losses.

Q3: How do I account for pump efficiency?
A: Multiply the result by the pump's volumetric efficiency (typically 0.85-0.95 for gear pumps).

Q4: What's typical displacement for hydraulic pumps?
A: Common ranges: gear pumps 0.2-12 in³/rev, piston pumps 0.5-60 in³/rev.

Q5: Does RPM affect pump life?
A: Yes, operating outside recommended RPM ranges can reduce pump life significantly.