1. What is an Air Hose Flow Rate Calculator?

Definition: This calculator estimates the volumetric flow rate of air through a hose in GPM (Gallons Per Minute) equivalent based on air velocity and hose cross-sectional area.

Purpose: It helps engineers, technicians, and HVAC professionals determine air flow rates for system design, troubleshooting, and optimization.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula converts the volumetric flow rate in cubic feet per second to gallons per minute equivalent for easier comparison with liquid flow rates.

3. Importance of Air Flow Rate Calculation

Details: Proper air flow rate estimation ensures efficient system operation, proper equipment sizing, and energy optimization in pneumatic systems.

4. Using the Calculator

Tips: Enter the air velocity in ft/s and the hose cross-sectional area in ft². For circular hoses, area = π × (diameter/2)². All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why use GPM equivalent for air flow?
A: GPM equivalent allows comparison between air and liquid flow rates in systems where both are present.

Q2: What's a typical air velocity in hoses?
A: Common velocities range from 20-40 ft/s for general applications, up to 60 ft/s for high-pressure systems.

Q3: How do I calculate hose cross-sectional area?
A: For circular hoses: Area = π × r² (where r is radius in feet). For other shapes, use appropriate geometric formulas.

Q4: Does this account for pressure changes?
A: No, this is for volumetric flow. For mass flow rate, you'd need to consider pressure and temperature.

Q5: What affects air flow rate in hoses?
A: Hose diameter, length, bends, pressure differential, and air viscosity all affect actual flow rates.