Quick Answer
Proper sizing for propane lines requires considering factors like gas flow rate, pressure drop, and distance between the propane tank and the appliance. A general rule of thumb is to size the line based on 1/4-inch per 10 feet of length, but this can vary depending on the specific application. It's essential to consult local building codes and manufacturer requirements.
Choosing the Right Propane Line Size
When selecting a propane line size, consider the gas flow rate in cubic feet per hour (CFH) and the pressure drop in inches of water column (inH2O). A common approach is to use the American Society of Mechanical Engineers (ASME) formula: (CFH x 0.000004) + (inH2O x 1.0) = Line Size (inches). For example, if you need 10 CFH and have a 5 inH2O pressure drop, the line size would be (10 x 0.000004) + (5 x 1.0) = 0.04 + 5 = 5.04 inches, which rounds up to a 5/8-inch line.
Line Sizing for Specific Appliances
Different appliances have varying gas flow requirements. For example, a residential furnace might require 150 CFH, while a BBQ grill might only need 20 CFH. When sizing a propane line for multiple appliances, it’s essential to calculate the total gas flow rate and apply a safety factor. A general rule of thumb is to add 10-20% to the total gas flow rate to account for line losses and pressure drops. This ensures that the propane line can supply enough gas to meet the demands of all connected appliances.
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