What causes foaming in a boiler, and how is it typically reduced?

Foaming in a boiler is primarily caused by overfilling, which leads to the creation of bubbles and foam at the water's surface. This phenomenon can significantly affect the performance and efficiency of the boiler, as it reduces the effective heating surface and can lead to carryover of water into the steam system.

To mitigate foaming caused by overfilling, skimming the surface of the water helps remove excess contaminants and bubbles that contribute to the foam formation. Improving water treatment is also essential in preventing foaming by reducing impurities and ensuring that the water chemistry is balanced. Proper management of the water level is crucial to avoid conditions that promote foaming.

While other factors contribute to boiler performance, the specific understanding of foaming connects most directly to the issue of overfilling and the recommended solutions.