GPM Conversion Formula:
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CC to GPM conversion calculates the flow rate in gallons per minute (GPM) of a pump based on its displacement in cubic centimeters per revolution (cc/rev) and its rotational speed in revolutions per minute (RPM). This is particularly useful for pool pump sizing and performance evaluation.
The calculator uses the conversion formula:
Where:
Explanation: The formula converts the pump's volumetric displacement per revolution to flow rate in gallons per minute based on its operating speed.
Details: Accurate flow rate calculation is essential for proper pool pump selection, ensuring adequate water circulation, efficient filtration, and optimal chemical distribution throughout the pool system.
Tips: Enter the pump's displacement in cc/rev (typically provided in pump specifications) and the operating RPM. Both values must be positive numbers for accurate calculation.
Q1: Why is 3785.41 used as the conversion factor?
A: 3785.41 is the number of cubic centimeters in one US gallon, which is necessary to convert from cc/min to gallons per minute.
Q2: What is a typical cc/rev value for pool pumps?
A: Pool pump displacements typically range from 5-50 cc/rev, depending on the pump size and design.
Q3: How does RPM affect the flow rate?
A: Flow rate is directly proportional to RPM - doubling the RPM will double the flow rate, assuming constant pump displacement.
Q4: Is this calculation accurate for all pump types?
A: This provides theoretical flow rate. Actual flow may vary due to pump efficiency, system pressure, and other factors.
Q5: What's a good GPM rate for pool circulation?
A: For residential pools, aim for a turnover rate of 6-8 hours, which typically requires 40-80 GPM depending on pool size.