1. What is a Compressed Air Flow Rate Calculator?

Definition: This calculator estimates the flow rate of compressed air in gallons per minute (GPM equivalent) based on velocity and cross-sectional area.

Purpose: It helps engineers and technicians determine compressed air flow for system design, maintenance, and troubleshooting.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (GPM equivalent)
• \( V \) — Velocity (feet per second)
• \( A \) — Cross-sectional area (square feet)
• 448.83 — Conversion factor (ft³/s to GPM)

Explanation: The formula converts the basic flow rate calculation (velocity × area) to GPM units for practical applications.

3. Importance of Flow Rate Calculation

Details: Accurate flow rate estimation ensures proper system sizing, energy efficiency, and prevents pressure drops in compressed air systems.

4. Using the Calculator

Tips: Enter the velocity in ft/s and cross-sectional area in ft². All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why use GPM for compressed air?
A: While CFM is more common, GPM equivalent helps compare with liquid systems and certain industrial standards.

Q2: What's a typical velocity for compressed air?
A: Recommended velocities range from 20-30 ft/s for branch lines to 50-60 ft/s for main headers.

Q3: How do I find the cross-sectional area?
A: For circular pipes: \( A = \pi \times (diameter/2)^2 \). Convert diameter from inches to feet.

Q4: Does this account for pressure and temperature?
A: No, this is a simplified calculation. For precise work, use more comprehensive formulas that include these factors.

Q5: What's the 448.83 conversion factor?
A: It converts cubic feet per second to gallons per minute (1 ft³/s = 448.83 GPM).