1. What is Propane Line Sizing?

Propane line sizing is the process of determining the appropriate pipe diameter for propane gas distribution systems. Proper sizing ensures adequate gas flow to appliances while maintaining safe pressure levels throughout the system.

2. How Does the Calculator Work?

The calculator uses the propane line sizing formula:

Where:

• \( \text{BTU/hr} \) — Total British Thermal Units per hour required by all appliances
• \( \text{Length} \) — Total pipe length in feet from source to farthest appliance
• \( \text{Pressure Drop} \) — Allowable pressure drop in inches of water column (in WC)

Explanation: This formula calculates the minimum pipe diameter needed to deliver the required BTU load while maintaining acceptable pressure levels throughout the system.

3. Importance of Proper Line Sizing

Details: Correct propane line sizing is crucial for system efficiency, appliance performance, and safety. Undersized pipes can cause pressure drops, poor appliance operation, and safety hazards, while oversized pipes increase material costs unnecessarily.

4. Using the Calculator

Tips: Enter the total BTU requirement of all connected appliances, the longest pipe run length in feet, and the allowable pressure drop in inches WC. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical pressure drop for propane systems?
A: Most residential propane systems allow 0.5-1.0 in WC pressure drop, but always consult local codes and appliance manufacturer specifications.

Q2: How do I calculate total BTU/hr requirements?
A: Sum the BTU ratings of all appliances that will operate simultaneously. Check appliance nameplates or specifications for BTU ratings.

Q3: What pipe length should I use?
A: Use the longest pipe run from the propane source to the farthest appliance, including all vertical and horizontal sections.

Q4: Are there limitations to this calculation?
A: This provides a basic sizing estimate. Complex systems with multiple branches may require more detailed calculations and professional engineering review.

Q5: What about elevation changes?
A: Significant elevation changes may require additional calculations. For every 15 feet of elevation rise, approximately 0.5 in WC pressure loss occurs.