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

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What can cause foaming in a boiler?

Low water levels in the boiler

High levels of impurities or surfactants in the boiler water

Foaming in a boiler occurs primarily due to high levels of impurities or surfactants present in the boiler water. When impurities such as oils, greases, or certain chemicals are introduced into the boiler water, they lower the surface tension of the water. This change in surface tension can lead to the formation of stable bubbles, resulting in foaming. Foaming can negatively impact the boiler's operation by not allowing for proper steam generation and potentially leading to water carryover into the steam lines, which can damage equipment and reduce efficiency.

While other factors, such as low water levels or high temperatures, can affect boiler operation, they do not directly relate to the foaming phenomenon in the same way that high levels of impurities or surfactants do. Understanding the chemistry of the boiler water and maintaining proper water quality is crucial in preventing foaming and ensuring efficient boiler operation.

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High temperatures of the boiler water

Excessive heat input during startup

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