In/Rev Gpm Formula For Flow Rate

Hydraulic Pump Flow Rate Formula:

\[ GPM = \frac{(in/rev \times RPM)}{231} \]

Flow Rate (GPM):

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1. What is the In/Rev GPM Formula?

The In/Rev GPM formula calculates the flow rate of hydraulic pumps in gallons per minute based on pump displacement and rotational speed. This fundamental hydraulic engineering equation is essential for designing and analyzing hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the hydraulic pump flow rate formula:

\[ GPM = \frac{(in/rev \times RPM)}{231} \]

Where:

\( GPM \) — Flow rate in gallons per minute
\( in/rev \) — Pump displacement in cubic inches per revolution
\( RPM \) — Pump rotational speed in revolutions per minute
\( 231 \) — Conversion factor (cubic inches to gallons)

Explanation: The formula converts the volumetric displacement per revolution multiplied by speed into flow rate, with 231 cubic inches equaling 1 US gallon.

3. Importance of Hydraulic Flow Rate Calculation

Details: Accurate flow rate calculation is crucial for hydraulic system design, pump selection, performance analysis, and ensuring proper system operation. It helps determine actuator speeds, system efficiency, and power requirements.

4. Using the Calculator

Tips: Enter pump displacement in cubic inches per revolution and rotational speed in RPM. Both values must be positive numbers. Typical pump displacements range from 0.1 to 20 in³/rev depending on pump size.

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 US gallon = 231 cubic inches).

Q2: What is typical GPM range for hydraulic pumps?
A: Typical ranges vary from 1-5 GPM for small applications to 50+ GPM for industrial systems, depending on pump size and speed.

Q3: Does this account for pump efficiency?
A: No, this calculates theoretical flow. Actual flow is theoretical flow multiplied by volumetric efficiency (typically 85-95%).

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

Q5: How does temperature affect the calculation?
A: Temperature affects fluid viscosity and pump efficiency but doesn't change the fundamental formula. Actual flow may vary with temperature changes.