On what basis are gas lines typically sized?

Gas lines are typically sized based on the total BTU load of the connected appliances and the length of the run. This method ensures that the gas supply can adequately meet the demand of all appliances while accounting for any pressure drop that may occur over the distance the gas needs to travel.

The total BTU load reflects the maximum energy requirement of all appliances using the gas line simultaneously. Knowing this load helps to determine the appropriate pipe size required to deliver sufficient gas volume without loss of pressure or flow. Additionally, considering the length of the run is crucial because longer runs may necessitate larger pipe diameters to mitigate pressure drops that can occur due to friction along the pipe's interior surfaces.

Choosing the right size based on these factors is essential for safe operation and efficiency. It prevents issues such as under-sizing, which could lead to insufficient gas supply during peak usage, or over-sizing, which may result in higher costs and inefficiencies.