New York Low Pressure Boiler COF Practice

At what pressure is a fusible plug typically not required?

1. Under 100 psi

2. Under 150 psi

3. Under 250 psi

4. Under 200 psi

The correct answer is: Under 200 psi

A fusible plug is a safety device typically utilized in steam boilers to prevent overheating and possible explosions. It is designed to melt at a specific temperature, allowing water to escape and preventing the buildup of excessive pressure. The requirement for a fusible plug generally depends on the operating pressure of the boiler. In most cases, a fusible plug is not required for boilers operating at pressures under 200 psi. This is due to the lower risk of critical pressure buildup at these levels, making the necessity for such a safety feature less critical. Therefore, when a boiler operates below this threshold, the risks associated with overheating and overpressure are sufficiently managed through regular operational procedures and other safety devices. At pressures of 250 psi and above, the risk increases significantly, and the installation of a fusible plug becomes more critical to ensure safety. Similarly, pressures at or above 150 psi also warrant the consideration of a fusible plug, as the potential hazards rise with increasing pressure. Hence, under normal operating conditions at pressures below 200 psi, the boiler can safely function without the specific requirement for a fusible plug.