1. What is the Gas Flow Rate Equation?

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

Purpose: It helps engineers and technicians calculate gas flow rates in piping systems for design and analysis purposes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Volumetric flow rate (GPM)
• \( V \) — Gas velocity (ft/s)
• \( A \) — Cross-sectional area (ft²)
• 448.83 — Conversion factor (ft³/s to GPM)

Explanation: The velocity and cross-sectional area are multiplied to get flow rate in ft³/s, then converted to GPM.

3. Importance of Gas Flow Rate Calculation

Details: Accurate flow rate calculations are essential for proper system design, ensuring adequate gas supply, and maintaining efficient operation.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why is the result in GPM when this is for gas?
A: GPM (gallons per minute) is used as a common volumetric flow unit, though the medium is gas. The conversion factor handles the unit conversion.

Q2: How do I calculate cross-sectional area?
A: For circular pipes: \( A = \pi \times (D/2)^2 \) where D is diameter in feet.

Q3: What's a typical gas velocity in pipes?
A: Typically 20-40 ft/s for compressed air systems, but varies by application and pressure.

Q4: Does this account for gas compressibility?
A: No, this is for incompressible flow approximation. For high-pressure systems, additional factors may be needed.

Q5: Can I use this for liquid flow?
A: Yes, the same equation applies for liquid flow rate calculations.