1. What is a Compressed Air Flow Rate Calculator?

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

Purpose: It helps engineers and technicians determine the flow rate of compressed air in piping systems for proper system design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Flow rate (GPM)
• \( V \) — Velocity of air (ft/s)
• \( A \) — Cross-sectional area (ft²)
• 448.83 — Conversion factor (ft³/s to GPM)

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

3. Importance of Flow Rate Calculation

Details: Proper flow rate estimation ensures correct pipe sizing, adequate system performance, and efficient compressed air delivery.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's a typical air velocity in pipes?
A: For compressed air systems, 20-30 ft/s is common for main lines, with lower velocities (10-15 ft/s) for branch lines.

Q2: How do I calculate pipe cross-sectional area?
A: Area = π × (pipe inner diameter in ft)² / 4. Convert diameter from inches to feet first.

Q3: Why convert to GPM?
A: GPM is a common unit for comparing flow rates, even for compressed air systems.

Q4: Does this account for pressure?
A: No, this calculates standard flow rate. Actual compressed air volume varies with pressure.

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).