Minnesota Special Engineer Boiler License Practice Exam 2026 - Free Boiler License Practice Questions and Study Guide

Question: 1 / 400

In boiler maintenance, what does "scaling" refer to?

The formation of bubbles in steam

The buildup of mineral deposits on boiler surfaces

Scaling refers to the buildup of mineral deposits on the surfaces of a boiler. This phenomenon occurs as water is heated and vaporized, leading to the concentration of dissolved minerals, such as calcium and magnesium, which precipitate out and form solid deposits. These deposits can significantly impair the efficiency of the boiler by reducing heat transfer, restricting water flow, and increasing the risk of overheating and potential failure of the boiler components. Regular maintenance and water treatment are essential to mitigate scaling and maintain optimal boiler operation. Understanding this concept is crucial for anyone involved in boiler maintenance and operation, as it highlights the importance of controlling water chemistry to prevent reliability issues.

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The corrosion of boiler metals

The adjustment of temperature controls

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