1. What is the Gas Flow Rate Equation?

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

Purpose: It helps engineers and technicians convert gas flow measurements to more familiar liquid flow units for comparison and system design.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (gallons per minute)
• \( V \) — Velocity (feet per second)
• \( A \) — Cross-sectional area (square feet)
• 448.83 — Conversion factor for units

Explanation: The formula converts the product of velocity and area to GPM equivalent, adjusted for gas density and unit conversion.

3. Importance of Gas Flow Rate Calculation

Details: Accurate flow rate calculations are essential for system design, performance evaluation, and equipment sizing in gas handling systems.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: Why use GPM for gas flow?
A: GPM provides a familiar reference point for comparing gas flows to liquid flows in equivalent terms.

Q2: What does the conversion factor represent?
A: The 448.83 factor converts cubic feet per second to gallons per minute and adjusts for gas density.

Q3: When would I need this calculation?
A: When designing or analyzing gas piping systems, ventilation systems, or any application involving gas flow.

Q4: How do I measure gas velocity?
A: Using anemometers, pitot tubes, or calculated from pressure differentials and known system characteristics.

Q5: Does this work for all gases?
A: The calculation provides a general estimate. For precise work with specific gases, additional density corrections may be needed.