What is the function of a Hartford loop in a boiler system?

The Hartford loop plays a critical role in protecting a boiler system from potential damage caused by ruptures in the condensate return line. This configuration involves a specific piping arrangement that ensures that if the return line fails, the boiler will not drain its water completely. Instead, the loop maintains a certain water level within the system even during such failures.

The purpose of the Hartford loop is to prevent a dangerous condition known as "dry firing," where a boiler operates without sufficient water, which can lead to overheating and possible failure of the boiler itself. By retaining a minimum level of water, the Hartford loop ensures that the boiler remains safe under a variety of operating conditions, thus safeguarding the entire heating system.

The other options do not accurately capture the primary function of the Hartford loop. Connecting multiple boilers, enhancing steam flow, or increasing heating efficiency are objectives that would be achieved using different components and design strategies within a boiler system but are not the specific purpose of the Hartford loop. The emphasis is on safety and operational integrity in preventing insufficient water levels during a possible line failure.