New York Low Pressure Boiler COF Practice

What is the safety valve popping tolerance and capacity for pressure levels between 71-300 psig?

1. 2 psig

2. 3%

3. 5 psig

4. 10 psig

The correct answer is: 3%

The safety valve popping tolerance and capacity for pressure levels between 71-300 psig is established to ensure safe operation of pressure vessels. The 3% popping tolerance is a critical measure that allows for slight variations in system pressure without compromising safety. When a safety valve is set to open at a specific pressure, a tolerance range of 3% means the valve may pop open slightly above that set pressure, accounting for fluctuations caused by normal system operation and conditions. This tolerance is significant because it provides a buffer to prevent the potential for over-pressure situations while ensuring that the safety valve functions effectively. The choice of 3% reflects industry standards that accommodate minor variations while prioritizing safety. Furthermore, adhering to this standard helps in maintaining compliance with regulatory requirements for pressure vessels and systems, thereby reducing the risk of accidents and ensuring operational safety. In contrast to other options, such as 2 psig, 5 psig, or 10 psig, they either do not align with the established standards for tolerance in this pressure range or represent limits that exceed acceptable engineering practices for safety valves operating in such conditions.