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"Thermal shock" refers to the mechanical stress and potential damage that occurs within boiler components when they are subjected to sudden changes in temperature. This phenomenon is particularly critical in boilers, where materials are designed to operate within specific temperature ranges. When a component experiences rapid cooling or heating, it can expand or contract quickly, leading to differential thermal stresses.

These stresses may result in cracking, warping, or other structural failures, particularly in materials that cannot evenly distribute the thermal load. For instance, if a cold water flow enters a very hot pipe suddenly, the outer layers of the pipe might contract while the inner layers remain hot, creating significant stress and potentially damaging the pipe.

Understanding thermal shock is essential for maintaining boiler integrity and ensuring safe operation, as preventing sudden temperature changes can mitigate the risks associated with material failure.