What is "thermal shock" in the context of boiler operations?

Thermal shock refers to the phenomenon of rapid temperature changes within a boiler that can lead to structural damage to its components. When water inside a boiler is heated or cooled too quickly, it causes stress due to varying temperature gradients. These rapid shifts can result in cracks and other types of damage to materials, especially in metals, which can expand and contract at different rates depending on the temperature.

Understanding this concept is vital for safe boiler operation. Slow and controlled temperature changes are crucial in maintaining the integrity of the boiler. Other options, while related to boiler operations, do not specifically define the critical aspect of thermal shock as understood in engineering. They may involve operational risks or issues, but do not capture the essence of how temperature fluctuations specifically impact the structural integrity of the boiler system.