What are the basics of boilers and corrosion? 【Basic Knowledge】

What are the methods to suppress boiler corrosion?

When it comes to boiler failures, people tend to imagine a large explosion, but the gradual progression of "corrosion" is also a significant factor that affects the lifespan of the equipment. ⬛︎ Types of Corrosion Corrosion in low-pressure boilers can be broadly classified into general corrosion, where the metal surface uniformly diminishes, and localized corrosion, where only specific areas are intensely affected. Localized corrosion includes pitting, which progresses deeply in spots, and crevice corrosion, which occurs at overlapping parts of components. From the perspective of maintaining healthy operation, localized corrosion is particularly concerning. Even if the overall structure appears sound, localized areas can progress deeply, leading to holes or leaks. ⬛︎ Key Points for Countermeasures To mitigate corrosion, managing water quality is fundamental. Specifically, it involves maintaining an appropriate pH (between 11.0 and 11.8), keeping harmful corrosive components below standard levels, removing dissolved oxygen (oxygen dissolved in water) that promotes corrosion, and ensuring that water is always flowing to prevent stagnation. Continuous maintenance of these factors requires regular water quality testing and chemical adjustments. Measures against corrosion through water treatment and guidelines for inspecting boiler equipment are explained in this document. Please download the document!

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