Hydraulic Pump Flow Calculator (GPM)

Hydraulic Pump Flow Equation:

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

Flow Rate (GPM):

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1. What is the Hydraulic Pump Flow Equation?

The hydraulic pump flow equation calculates the flow rate in gallons per minute (GPM) based on the pump's displacement and rotational speed. This is essential for sizing hydraulic systems and ensuring proper fluid flow.

2. How Does the Calculator Work?

The calculator uses the hydraulic pump flow equation:

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

Where:

\( GPM \) — Flow rate in gallons per minute
\( Displacement \) — Pump displacement per revolution (cubic inches)
\( RPM \) — Pump speed in revolutions per minute
\( 231 \) — Conversion factor (cubic inches per gallon)

Explanation: The equation converts the pump's volumetric displacement at a given speed into a flow rate measurement.

3. Importance of GPM Calculation

Details: Accurate flow rate calculation is crucial for hydraulic system design, ensuring proper component sizing, and maintaining system efficiency.

4. Using the Calculator

Tips: Enter pump displacement in cubic inches per revolution and RPM. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is pump displacement?
A: The volume of fluid the pump can move per revolution, typically specified by the manufacturer.

Q2: Why is 231 the conversion factor?
A: There are 231 cubic inches in a US gallon, which converts the units from in³/min to gallons/min.

Q3: Does this work for all pump types?
A: This applies to positive displacement pumps (gear, piston, vane). Centrifugal pumps follow different principles.

Q4: How does efficiency affect the calculation?
A: Actual flow may be less due to pump efficiency (volumetric losses). Multiply result by pump efficiency for more accuracy.

Q5: What about multi-stage pumps?
A: For multi-stage pumps, use the total displacement (sum of all stages) in the calculation.