1. What is the Hydraulic GPM Formula?

The hydraulic GPM (gallons per minute) formula calculates the flow rate of a hydraulic pump based on its displacement and rotational speed. This is essential for determining the performance and capacity of hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the hydraulic GPM formula:

Where:

• \( Displacement \) — Pump displacement in cubic inches per revolution (cu in/rev)
• \( RPM \) — Rotational speed in revolutions per minute (rev/min)
• \( 231 \) — Conversion factor (cubic inches to gallons)

Explanation: The formula converts the volumetric displacement per revolution into gallons per minute based on the pump's rotational speed.

3. Importance of GPM Calculation

Details: Accurate GPM calculation is crucial for hydraulic system design, pump selection, and ensuring proper flow rates for hydraulic components and actuators.

4. Using the Calculator

Tips: Enter pump displacement in cu in/rev and RPM in rev/min. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 231 used in the formula?
A: 231 is the conversion factor from cubic inches to US gallons (1 gallon = 231 cubic inches).

Q2: What is typical displacement for hydraulic pumps?
A: Displacement varies widely by pump type and size, typically ranging from 0.1 to 10+ cu in/rev for industrial applications.

Q3: How does RPM affect GPM output?
A: GPM is directly proportional to RPM - doubling the RPM doubles the flow output, assuming constant displacement.

Q4: Can this formula be used for hydraulic motors?
A: Yes, the same formula applies to hydraulic motors for calculating flow requirements based on displacement and speed.

Q5: What factors can affect actual vs calculated GPM?
A: Efficiency losses, fluid viscosity, system pressure, and temperature can cause actual flow to differ from theoretical calculations.