1. What is Pump Speed vs Flow Rate Calculator?

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

3. Importance of Pump 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 speed in RPM and displacement in cubic inches per revolution. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 cubic inches equals 1 US gallon, converting the volume from cubic inches to gallons.

Q2: What's a typical displacement for hydraulic pumps?
A: Displacement varies widely (0.1-10 in³/rev) depending on pump type and size.

Q3: Does this account for pump efficiency?
A: No, this gives theoretical flow. Multiply by volumetric efficiency (typically 0.85-0.95) for actual flow.

Q4: Can I calculate RPM needed for a specific flow?
A: Yes, rearrange the formula: RPM = (Q × 231) / D_p

Q5: What if my pump has metric specifications?
A: Convert cc/rev to in³/rev (1 cc = 0.061 in³) or use metric formula: Q = (RPM × D_p) / 60000 (for L/min)