New York Low Pressure Boiler COF Practice

In a boiler without mechanical feed, what is the set pressure for the safety valve?

1. 10%

2. 6%

3. 15%

4. 5%

The correct answer is: 6%

In a boiler without mechanical feed, the safety valve is designed to open at a set pressure to prevent excessive pressure buildup within the system. The standard set pressure for the safety valve in such boilers is typically 6% above the maximum allowable working pressure (MAWP). This ensures that the boiler operates safely within its design limits while also providing a margin of safety against overpressure situations. This percentage is chosen based on industry standards and practices that aim to minimize the risk of catastrophic failure by allowing the safety valve to act before any dangerous pressure levels are reached. By regulating the pressure effectively, the safety valve helps protect the integrity of the boiler and maintain safe operating conditions. In contrast, other set pressures like 10%, 15%, or 5% might not conform to the safety standards sought for boilers without mechanical feed, deviating from the recognized practices for safety margins. Such differences can lead to either excessive strain on the equipment or premature opening of the valve, both of which can compromise safety and efficiency.