What does the presence of bulges or blisters on the fireside of a boiler indicate?

The presence of bulges or blisters on the fireside of a boiler is indicative of overheating. When a boiler operates at elevated temperatures beyond its design parameters, the metal surfaces can start to deform due to excessive thermal stress. Overheating can lead to the formation of these bulges or blisters, which are often signs that the material is losing its integrity and could fail if not addressed.

In a boiler, maintaining appropriate temperature levels is critical for safe and efficient operation. If the materials exceed their temperature limits, it compromises the structural integrity of the boiler, posing significant safety hazards. Recognizing these signs early, such as bulges and blisters, is essential for maintenance to prevent catastrophic failures.

Understanding this can help reinforce the importance of monitoring operating conditions and ensuring that a boiler does not exceed its temperature thresholds to maintain safe operation.