What is the purpose of drip legs in fuel gas piping systems?

The purpose of drip legs in fuel gas piping systems is to collect condensation and moisture that may accumulate within the piping. Gas, when cooled or under certain conditions, can carry moisture that, if not removed, could reach appliances or equipment and cause operational issues or even damage. By incorporating drip legs into the design of the piping system, the moisture can be collected at low points in the system, which facilitates its removal without impacting the gas supply to the appliances. This helps maintain the integrity and efficiency of the gas system, ensuring safe and reliable operation.

Increasing gas pressure, allowing for gas expansion, and isolating sections of piping for maintenance address different aspects of gas system management but do not pertain to the function of drip legs, which are specifically aimed at moisture control.