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What is the function of a return line in a boiler system?

To add fuel

To remove sludge

To return condensate back for reheating

The function of a return line in a boiler system is to return condensate back to the boiler for reheating. In steam systems, after steam is generated and used in various processes, it condenses back into water. This condensate is often hot and can be reused, which is efficient and helps maintain the system’s thermal energy. By returning this water to the boiler, it minimizes water and energy waste, ultimately improving the system's efficiency and reducing the need for additional freshwater make-up.

In contrast, adding fuel, removing sludge, or releasing excess pressure are not functions associated with the return line. These activities are handled through other components of the boiler system, which manage fuel supply, drainage of sediment, and pressure control, respectively. The return line’s primary role is specifically linked to the recycling of water and steam within the heating process.

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To release excess pressure

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