What defines a bulge in a boiler?

A bulge in a boiler is defined as a deformation of a boiler plate that arises due to overheating and pressure. This issue typically occurs when the boiler experiences excessive internal pressure or temperatures, leading to the expansion of the metal beyond its design limits. As a result, the metal weakens and begins to deform, taking on a bulging shape.

This phenomenon is a critical safety concern in the operation of boilers, as it can compromise the structural integrity of the boiler, potentially leading to catastrophic failure if not addressed promptly. The identification of bulges often prompts an inspection of the boiler to ensure it is safe to continue operation.

In contrast, options referring to expansion joints, design flaws, or pressure relief mechanisms describe different concepts related to boiler operation and safety but do not specifically define what a bulge is or the conditions leading to its formation.