The Propane Pipe Sizing Calculator is a tool designed to help users determine the optimal pipe size required to transport propane gas from a source to propane appliances efficiently and safely. This calculation is crucial in minimizing pressure drop and maintaining adequate gas flow.
Formula of Propane Pipe Sizing Calculator
The calculator uses a specific formula to ascertain the proper pipe diameter based on the total BTU per hour requirements of the appliances, the allowable pressure drop, and the length of the pipe run. The formula is:
Where:
- BTU/hour is the total BTU capacity of all appliances connected to the system.
- ΔP is the allowable pressure drop, usually specified in inches of water column.
- L is the length of the pipe run, usually in feet.
Calculator Inputs
To use the calculator, you’ll need the following inputs:
- Total BTU/Hour: The combined BTU output of all appliances the pipe will supply.
- Allowable Pressure Drop (ΔP): The maximum acceptable pressure loss in the system, typically around 0.5 inches of water column for residential applications.
- Length of Pipe Run (L): The total length from the gas source to the farthest appliance in feet.
Conversion Table for Common Calculations
To simplify the process further, here’s a table that provides quick reference values for common BTU capacities, pressure drops, and pipe lengths:
| Total BTU/Hour | Pressure Drop (ΔP) inches WC | Length of Pipe (Feet) | Pipe Diameter (Inches) |
|---|---|---|---|
| 50,000 | 0.3 | 50 | 0.75 |
| 100,000 | 0.3 | 50 | 1.05 |
| 150,000 | 0.3 | 50 | 1.29 |
| 200,000 | 0.3 | 50 | 1.49 |
Example of Propane Pipe Sizing Calculator
Let’s say you need to run a propane line to three appliances with a total BTU of 100,000 per hour, the allowable pressure drop is 0.3 inches of water column, and the pipe run is 50 feet long. Using the formula:
Pipe Size (inches) = √(100,000 ÷ (0.6 × 0.3 × 50))
= √(100,000 ÷ 9)
= √11111.11 = 105.5 inches
Therefore, the required pipe diameter would be approximately 1 inch.
Most Common FAQs
A: A lower pressure drop will require a larger pipe to maintain the same flow rate. Recalculate using the formula with your specific ΔP value.
A: No, this calculator is specifically designed for propane installations. Natural gas systems operate at different pressures and have different sizing requirements.
A: The calculator is highly accurate when the correct inputs are use. It is always recommend to consult with a professional engineer for critical applications.