1. What is a Propane Gas Pipe Sizing Calculator?

Definition: This calculator determines the appropriate pipe diameter for propane gas systems based on flow rate, gas velocity, and area factor.

Purpose: It helps HVAC professionals and gas system installers select the correct pipe size for safe and efficient propane gas delivery.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D \) — Pipe diameter (inches)
• \( Q \) — Gas flow rate (cubic feet per hour)
• \( V \) — Gas velocity (feet per second)
• \( F \) — Area factor (dimensionless, typically 0.7854 for circular pipes)

Explanation: The formula calculates the minimum pipe diameter needed to maintain proper gas flow while limiting velocity to safe levels.

3. Importance of Proper Pipe Sizing

Details: Correct pipe sizing ensures adequate gas supply to appliances, maintains safe pressure levels, and prevents excessive pressure drops.

4. Using the Calculator

Tips: Enter the gas flow rate in cfh, desired gas velocity (default 10 ft/s), and area factor (default 0.7854). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical gas velocity for propane systems?
A: 10-15 ft/s is common for residential systems, while commercial systems may use higher velocities up to 20 ft/s.

Q2: How do I determine the gas flow rate (Q)?
A: Sum the BTU ratings of all appliances and convert to cfh (divide total BTU by 2500 for propane).

Q3: When would I change the area factor?
A: The default 0.7854 (π/4) is for circular pipes. Use different values for non-circular conduits.

Q4: Does this account for pipe length and fittings?
A: No, this is for sizing only. Pressure drop calculations require additional factors for pipe length and fittings.

Q5: What's the maximum recommended velocity?
A: For propane, velocities above 20 ft/s may cause noise and excessive pressure drops in residential systems.