1. What is Pump RPM vs Flow Rate Calculator?

Definition: This calculator determines the flow rate (GPM) of a hydraulic pump based on its RPM and displacement volume.

Purpose: It helps hydraulic system designers and technicians understand the relationship between pump speed and fluid flow.

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 speed and displacement.

3. Importance of Pump Flow Rate Calculation

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

4. Using the Calculator

Tips: Enter the pump RPM and displacement (found in pump specifications). Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 the conversion factor?
A: 231 cubic inches equals 1 US gallon, converting cubic inches per minute to gallons per minute.

Q2: Does this account for pump efficiency?
A: No, this is theoretical flow. Actual flow will be less due to volumetric efficiency (typically 85-95%).

Q3: What's a typical displacement for hydraulic pumps?
A: Common gear pumps range from 0.25 to 10 in³/rev, while piston pumps can go much higher.

Q4: How does flow rate affect system pressure?
A: Flow rate determines fluid velocity, which affects pressure drops but doesn't directly determine system pressure.

Q5: Can I calculate RPM needed for a desired flow rate?
A: Yes, rearrange the formula: RPM = (Q × 231) / D_p