What is the purpose of a drip leg in a gas line?

The purpose of a drip leg in a gas line is to collect condensate. As gas travels through a pipeline, it can carry moisture which may condense into liquid form due to changes in temperature or pressure. A drip leg is a vertical section of pipe installed at the lowest point of the gas line to gather this condensate, allowing it to be drained away safely. This helps prevent the buildup of liquid in the gas line that could potentially obstruct flow or cause other issues within the gas system. Maintaining a clear line is essential for efficient and safe operation of gas appliances and systems.

While preventing leaks, measuring gas flow, and regulating pressure are important functions in a gas system, they are not the primary role of a drip leg. Preventing leaks is typically addressed through proper connections and fittings, measuring gas flow is done with flow meters, and pressure regulation is managed by pressure regulators, each serving distinct functions within the gas system.