What are the two types of fusible plugs?

Fusible plugs are critical safety devices used in various engineering applications, particularly in steam boilers and pressure vessels, to prevent over-pressurization and potential explosions. The two types of fusible plugs are categorized based on their function and location concerning the heat source.

The fire side refers to the area where heat is applied, typically by combustion, in a boiler or a similar device. Conversely, the water side pertains to the side that contains water, which absorbs heat from the fire side to produce steam. In a properly functioning system, a fusible plug installed on the fire side is designed to melt at a specific temperature, allowing steam to escape and preventing excess pressure buildup. The corresponding fusible plug on the water side acts as a safeguard to ensure that, in case of overheating or other malfunctions, the water can safely exit the system to avoid catastrophic failures.

Understanding this distinction is crucial for the safe operation of boilers and similar equipment, emphasizing the importance of maintaining both the fire and water sides in operational order to mitigate risks associated with pressure build-up.