For what purpose is a fusible plug utilized in boiler operations?

A fusible plug serves a very specific purpose in boiler operations: it is designed to relieve pressure and prevent potential explosions from overheating. In the event that the boiler's water level drops too low and the temperature of the residual water increases, the fusible plug, typically made from a metal that melts at a certain temperature, will melt. This melting results in a hole that allows steam or steam pressure to escape. This function is critical as it provides a safety mechanism to prevent damage to the boiler and protect against hazardous situations, such as a boiler explosion that could occur due to excessive pressure buildup.

The other options do not align with the primary function of a fusible plug. For instance, while stopping leaks is essential for maintaining boiler efficiency and safety, it is not the role of a fusible plug. Measuring temperature is typically done through thermometers or temperature gauges, rather than via a fusible plug. Managing water levels is accomplished through various water level control systems, making it unrelated to the specific role of a fusible plug in pressure relief. Thus, the primary function of the fusible plug in boiler operations is accurately represented by its use in relieving pressure.