At what temperature range do fusible plugs melt?

Fusible plugs are safety devices commonly found in pressurized systems, such as boilers and pressure vessels, designed to melt and relieve pressure in case of overheating. The melting temperature of these plugs is crucial for their function, as it allows them to activate safely and prevent catastrophic failures.

The correct temperature range for fusible plugs typically falls between 70-74 degrees Celsius. This range ensures that the plugs will melt before the temperature becomes excessively dangerous, thus providing an effective means of pressure relief. The melting occurs at a temperature high enough to avoid accidental activation during normal operating conditions but low enough to respond appropriately in the event of a malfunction or overheating.

In practice, if the temperature rises to the point where the fusible plug melts, it indicates that the system is in a potentially hazardous condition, allowing for safe venting of pressure. This characteristic design is key for maintaining safety in wastewater treatment and similar applications.