1. What is the Ft/Sec to GPM Conversion?

The Ft/Sec to GPM conversion calculates flow rate in gallons per minute from fluid velocity in feet per second and pipe diameter in inches. This is essential for hydraulic calculations in plumbing, irrigation, and fluid systems.

2. How Does the Calculator Work?

The calculator uses the conversion formula:

Where:

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

Explanation: The formula converts velocity and cross-sectional area to volumetric flow rate, accounting for unit conversions between feet, inches, and gallons.

3. Importance of Flow Rate Conversion

Details: Accurate flow rate calculation is crucial for system design, pump selection, pipe sizing, and ensuring proper fluid delivery in various engineering applications.

4. Using the Calculator

Tips: Enter velocity in feet per second and diameter in inches. Both values must be positive numbers. The calculator provides flow rate in gallons per minute.

5. Frequently Asked Questions (FAQ)

Q1: What is the 0.408 constant derived from?
A: The constant comes from unit conversions: 1 ft³/s = 448.831 GPM and area calculation from diameter in inches to feet.

Q2: Can this formula be used for any fluid?
A: Yes, for water and similar density fluids. For significantly different densities, additional adjustments may be needed.

Q3: What are typical velocity ranges in pipes?
A: Typically 2-8 ft/s for water systems. Higher velocities increase friction loss, lower velocities may cause sedimentation.

Q4: How accurate is this conversion?
A: Very accurate for standard conditions. Assumes full pipe flow and consistent velocity profile across the cross-section.

Q5: Can I use this for rectangular ducts?
A: No, this formula is specifically for circular pipes. For rectangular ducts, use area-based calculations instead.