What substance is typically added to boiler water to prevent carbonic acid issues in condensate lines?

The addition of amine to boiler water serves a crucial role in preventing carbonic acid issues that can arise in condensate lines. When steam is generated and subsequently condenses back into water, it can absorb carbon dioxide from the air or even from the water itself, forming carbonic acid. This acid can lead to corrosion in the condensate lines and other components of the steam system.

Amine compounds are specifically designed to neutralize carbonic acid, raising the pH of the condensate and thus mitigating the corrosive effects. They work by forming a protective layer over metal surfaces, helping to prevent corrosion and extending the lifespan of the equipment.

Other options present different roles. Chemical treatments can include a variety of substances, but they are more general and not specifically aimed at addressing carbonic acid. Chlorine is typically used for disinfection or bacteria control, not for managing pH levels in condensate. Sodium carbonate, while it can reduce acidity, is not as effective as amines when it comes to protecting against carbonic acid in condensate lines specifically. Therefore, amine is the substance that best addresses the problem posed in this scenario.