1. What is the Flow Rate and RPM Relation?

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

Purpose: It helps engineers and technicians in hydraulic system design and troubleshooting by relating pump speed to fluid flow.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( RPM \) — 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 a pump moves per minute based on its speed and displacement volume.

3. Importance of Flow Rate Calculation

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

4. Using the Calculator

Tips: Enter the pump RPM and displacement volume (in³/rev). Both 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, converting the displacement volume to gallons per minute.

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

Q4: Can I calculate RPM from flow rate?
A: Yes, rearrange the formula: RPM = (Q × 231) / D_p

Q5: What about variable displacement pumps?
A: Use current displacement setting. For electronically controlled pumps, consult manufacturer specs.