What is the primary function of a steam trap?

The primary function of a steam trap is to remove condensate and air from steam lines while preventing the escape of steam. Steam traps are essential components in steam systems because, as steam cools, it condenses back into water (condensate), and any non-condensable gases, such as air, must be removed to maintain system efficiency.

By effectively managing the condensate and air, steam traps help to ensure that steam remains in the system where it can be used for heating or other processes. If condensate or air accumulates, it can lead to reduced heat transfer efficiency, water hammer, or damage to the system. The design of steam traps allows them to close when steam is present, ensuring that steam does not escape and is utilized effectively.

This functionality is crucial for maintaining the efficiency and reliability of steam heating systems, making the correct answer accurate in describing the steam trap's role.