1. What is GPM to ft/s Conversion?

The GPM to ft/s conversion calculates the flow velocity in feet per second based on the flow rate in gallons per minute and the pipe diameter in inches. This is essential for fluid dynamics and pipe system design.

2. How Does the Calculator Work?

The calculator uses the flow velocity formula:

Where:

• \( v \) — Flow velocity (ft/s)
• \( GPM \) — Flow rate (gallons per minute)
• \( d \) — Pipe diameter (inches)
• 0.408 — Conversion constant

Explanation: The formula converts volumetric flow rate to linear velocity by considering the cross-sectional area of the pipe.

3. Importance of Flow Velocity Calculation

Details: Flow velocity calculation is crucial for pipe sizing, pressure drop analysis, erosion prevention, and ensuring efficient fluid transport in piping systems.

4. Using the Calculator

Tips: Enter flow rate in GPM and pipe diameter in inches. Both values must be positive numbers. The calculator will output velocity in feet per second.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical flow velocity range for water pipes?
A: Typically 2-8 ft/s for water distribution systems. Higher velocities may cause erosion and noise.

Q2: Why is the constant 0.408 used?
A: It combines conversion factors for gallons to cubic feet (1 gal = 0.133681 ft³) and minutes to seconds (1 min = 60 s), divided by the area conversion factor.

Q3: Can this formula be used for other fluids?
A: Yes, but the constant may vary slightly for fluids with different densities. For water and similar density fluids, it's accurate.

Q4: What if I have diameter in feet instead of inches?
A: Convert diameter to inches first (1 foot = 12 inches) or use the formula: v = GPM × 0.002228 / (d²) where d is in feet.

Q5: How does pipe diameter affect flow velocity?
A: Velocity is inversely proportional to the square of the diameter. Doubling the diameter reduces velocity to one-quarter.