What is the primary purpose of an overflow trap in gas pipelines?

The primary purpose of an overflow trap in gas pipelines is to prevent backflow of gas or condensate. An overflow trap is a crucial safety device designed to ensure that any liquid, such as condensate that may collect in a gas line, does not flow back into the pipeline or system, which could create hazardous conditions. By maintaining the correct flow direction and preventing backflow, the trap helps to ensure the safe and efficient operation of the gas system, reducing the risk of gas leaks or pressure issues that could lead to system failures. This function is critical in maintaining the integrity of the gas delivery system and ensuring safety for both equipment and personnel.

Other options focus on different aspects of gas management, such as cooling, filtering, or leak prevention, but the specific role of an overflow trap is fundamentally linked to maintaining proper flow direction and preventing the backflow of potentially harmful substances.