1. What is the GPM Formula?

The GPM (Gallons Per Minute) formula calculates flow rate from velocity and cross-sectional area. It is commonly used in fluid dynamics and hydraulic engineering to determine the volumetric flow rate of liquids through pipes or channels.

2. How Does the Calculator Work?

The calculator uses the GPM formula:

Where:

• \( Velocity \) — Flow velocity in feet per second (ft/s)
• \( Area \) — Cross-sectional area in square feet (ft²)
• \( 448.83 \) — Conversion factor to convert from ft³/s to gallons per minute

Explanation: The formula converts the product of velocity and area (which gives flow in cubic feet per second) to gallons per minute using the appropriate conversion factor.

3. Importance of GPM Calculation

Details: Accurate GPM calculation is essential for designing piping systems, sizing pumps, determining water supply requirements, and ensuring proper fluid flow in various engineering applications.

4. Using the Calculator

Tips: Enter velocity in ft/s and area in ft². Both values must be positive numbers. The calculator will provide the flow rate in gallons per minute.

5. Frequently Asked Questions (FAQ)

Q1: What is the conversion factor 448.83 derived from?
A: 448.83 comes from converting cubic feet per second to gallons per minute (1 ft³/s = 448.83 gal/min).

Q2: Can this formula be used for any fluid?
A: Yes, the formula works for any incompressible fluid, though the units assume measurements in the imperial system.

Q3: What if I have diameter instead of area?
A: For circular pipes, area can be calculated as \( \pi \times (diameter/2)^2 \).

Q4: How accurate is this calculation?
A: The calculation is mathematically precise. Accuracy depends on the precision of your velocity and area measurements.

Q5: Can this be used for compressible fluids like air?
A: No, this formula is specifically for incompressible fluids. Compressible fluids require different calculations that account for density changes.