Rpm To Gpm Calculator

GPM Formula:

\[ GPM = \frac{RPM \times Displacement}{231} \]

GPM (gallons per minute):

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1. What is the RPM to GPM Formula?

The RPM to GPM formula calculates gallons per minute from revolutions per minute and displacement. This is particularly useful in hydraulic systems and pump applications where flow rate needs to be determined based on rotational speed and pump displacement.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ GPM = \frac{RPM \times Displacement}{231} \]

Where:

\( RPM \) — Revolutions per minute
\( Displacement \) — Pump displacement in cubic inches per revolution (in³/rev)
\( 231 \) — Conversion factor (cubic inches per gallon)

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

3. Importance of GPM Calculation

Details: Accurate GPM calculation is crucial for designing hydraulic systems, selecting appropriate pumps, ensuring proper flow rates for applications, and optimizing system performance and efficiency.

4. Using the Calculator

Tips: Enter RPM (revolutions per minute) and Displacement (in cubic inches per revolution). Both values must be positive numbers greater than zero for accurate calculation.

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: Can this formula be used for all types of pumps?
A: This formula works best for positive displacement pumps where the displacement per revolution is constant. It may not be accurate for centrifugal pumps or other pump types with variable displacement.

Q3: What are typical GPM values for hydraulic systems?
A: GPM values vary widely depending on the application, from less than 1 GPM for small systems to over 100 GPM for large industrial hydraulic systems.

Q4: How does temperature affect the calculation?
A: While the basic formula doesn't account for temperature, in real-world applications, temperature can affect fluid viscosity and pump efficiency, which may impact actual flow rates.

Q5: Can this calculator be used for metric units?
A: This calculator uses US customary units. For metric calculations, different conversion factors would be needed (e.g., liters per minute instead of gallons per minute).