What is the purpose of a condensate return line?

The purpose of a condensate return line is to efficiently return condensate—water that has formed from the steam after it has released its heat back to the boiler. In steam systems, as steam travels through the pipes and heats various components or spaces, it loses its heat and transforms back into water (condensate). The condensate return line is crucial as it collects this water and channels it back to the boiler for reheating, which helps to maintain system efficiency and reduces the need for fresh water make-up. By recycling the condensate, the system minimizes water waste and energy consumption while ensuring that the boiler has the necessary water supply for producing steam.

Other choices do not align with the primary function of a condensate return line. For instance, supplying fresh water to the boiler involves a separate process and system component, while removing steam would negate the operating principle of the steam system. Relieving excess pressure is also managed by different types of safety valves and not the return line.