New York Low Pressure Boiler COF Practice

When is a fusible plug not required to be installed on a boiler?

1. Below 200 psig

2. Over 200 psig

3. At steam pressure

4. When the boiler is inactive

The correct answer is: Over 200 psig

A fusible plug is a safety device designed to prevent overheating in a boiler by melting and allowing water to escape in case of a severe overheating situation. The need for a fusible plug is typically determined by the operating pressure of the boiler. When considering the requirement for a fusible plug, boilers operating over a certain pressure, specifically 200 psig, typically do not require the installation of this device. This is because higher-pressure boilers have different safety mechanisms in place and are subject to more stringent operating conditions and inspections. As the pressure increases, the risks associated with overheating may be mitigated through engineering controls and operational procedures rather than utilizing a fusible plug, which is more suited for lower-pressure applications where rapid overheating could lead to catastrophic failure. Consequently, for boilers exceeding a pressure of 200 psig, relying on alternative safety systems is deemed more effective and appropriate. This regulatory distinction helps to ensure that safety devices are utilized where they are most beneficial, maintaining the operational integrity and safety of high-pressure systems.