In/Rev Gpm Formula For Calculator For Water

In/Rev GPM Formula:

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

GPM (gal/min):

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1. What is the In/Rev GPM Formula?

The In/Rev GPM formula calculates the flow rate in gallons per minute (GPM) for water pumps based on displacement (in cubic inches per revolution) and rotational speed (RPM). It provides an accurate assessment of pump performance and flow capacity.

2. How Does the Calculator Work?

The calculator uses the In/Rev GPM formula:

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

Where:

\( Displacement \) — Pump displacement in cubic inches per revolution (in³/rev)
\( RPM \) — Rotational speed in revolutions per minute (rev/min)
\( 231 \) — Conversion factor (cubic inches to gallons)

Explanation: The formula accounts for the volumetric displacement of the pump per revolution and scales it by the rotational speed to determine the flow rate in gallons per minute.

3. Importance of GPM Calculation

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

4. Using the Calculator

Tips: Enter displacement in in³/rev, RPM in rev/min. All values must be valid positive numbers (displacement > 0, RPM > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why use 231 as the conversion factor?
A: 231 is used because there are 231 cubic inches in one US liquid gallon, making it the standard conversion factor for this calculation.

Q2: What are typical GPM values for water pumps?
A: Typical values range from 5-100 GPM for residential applications, and can go much higher for industrial pumps, depending on pump size and design.

Q3: Does this formula work for all types of fluids?
A: This formula is specifically designed for water. For other fluids, density and viscosity factors may need to be considered for accurate flow calculations.

Q4: How does pump efficiency affect the actual GPM?
A: The formula calculates theoretical flow. Actual flow may be lower due to pump efficiency, system pressure, and fluid properties.

Q5: Can this formula be used for variable speed pumps?
A: Yes, the formula works for any RPM value. For variable speed applications, simply input the current RPM to calculate the corresponding GPM.