What does high surface tension of boiler water due to foreign matter cause?

High surface tension of boiler water caused by foreign matter typically leads to an increase in foaming. This phenomenon occurs because the presence of impurities or contaminants in the water interferes with the normal boiling process. When water boils, steam bubbles form and need to expand and rise to the surface. However, an increased surface tension can inhibit this process, resulting in smaller and more stable bubbles that do not break easily, leading to excessive foaming.

Foaming in a boiler can be particularly problematic as it reduces the effective heat transfer within the boiler, which can lead to inefficient operation and potential damage. It can also cause issues with water carryover into the steam system, resulting in water being transported into areas that require only steam, which can damage equipment and processes.

Understanding this relationship helps in managing water treatment programs effectively to mitigate the effects of foreign matter in boiler systems.