Calculate Pump Flow Rate From Rpm

Pump Flow Rate Equation:

\[ Q_{rpm} = \frac{Disp \times RPM}{231} \]

Pump Flow Rate (Q_rpm):

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1. What is Pump Flow Rate Calculation?

The pump flow rate calculation determines the volumetric flow rate of a hydraulic pump based on its displacement and rotational speed. It's essential for sizing pumps and designing hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the pump flow rate equation:

\[ Q_{rpm} = \frac{Disp \times RPM}{231} \]

Where:

\( Q_{rpm} \) — Pump flow rate (GPM)
\( Disp \) — Pump displacement (in³/rev)
\( RPM \) — Rotational speed (revolutions per minute)
231 — Conversion factor (cubic inches to gallons)

Explanation: The equation calculates the flow rate by multiplying the pump's displacement per revolution by its rotational speed, then converting the result from cubic inches per minute to gallons per minute.

3. Importance of Pump Flow Rate Calculation

Details: Accurate pump flow rate calculation is crucial for proper hydraulic system design, pump selection, and ensuring adequate fluid delivery to system components.

4. Using the Calculator

Tips: Enter pump displacement in cubic inches per revolution and RPM value. Both values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is pump displacement?
A: Pump displacement refers to the volume of fluid that the pump can move per revolution, typically measured in cubic inches per revolution (in³/rev).

Q2: Why is 231 used in the formula?
A: 231 is the conversion factor from cubic inches to US gallons (1 gallon = 231 cubic inches).

Q3: What are typical displacement values for hydraulic pumps?
A: Displacement values vary widely depending on pump type and size, ranging from small pumps around 0.1 in³/rev to large pumps exceeding 10 in³/rev.

Q4: Does this calculation account for pump efficiency?
A: No, this calculation provides theoretical flow rate. Actual flow rate may be lower due to volumetric efficiency losses.

Q5: Can this formula be used for all types of pumps?
A: This formula is primarily used for positive displacement pumps (gear pumps, piston pumps, vane pumps) where displacement is a fixed characteristic.