New York Low Pressure Boiler COF Practice

How often should fusible plugs be replaced?

1. Every six months

2. Annually

3. Every two years

4. When indications of failure occur

The correct answer is: Annually

Fusible plugs serve a critical safety function in low pressure boilers, designed to melt and relieve pressure when temperatures exceed safe levels, thereby preventing catastrophic failures. Annual replacement of fusible plugs is advised to ensure they remain effective and reliable. Over time, the materials of the fusible plug can degrade due to factors such as heat cycling and thermal stress, which may not be immediately visible. While it's important to check for any signs of wear or failure regularly, relying solely on indications of failure can be risky, as failure may occur without noticeable external signs. Regular annual replacement minimizes the risk of relying on components that may no longer function as intended due to unseen deterioration, ensuring the boiler operates within safe parameters. Regular maintenance, including the annual replacement of fusible plugs, is a key part of a comprehensive safety and maintenance program for low pressure boilers.