New York Low Pressure Boiler COF Practice

If you are receiving 16-90 psig from an outside source, to what pressure should the system be designed?

1. 100 psig

2. 125 psig

3. 150 psig

4. 200 psig

The correct answer is: 125 psig

When designing a system that receives an incoming pressure of 16-90 psig, it is crucial to account for equipment specifications, safety margins, and local codes. Designing the system to a pressure that exceeds the maximum incoming pressure is standard practice to ensure reliability and operational safety. Choosing a design pressure of 125 psig is fitting because it provides an adequate safety margin above the highest possible operating pressure (which in this case is 90 psig). The additional 35 psig allows for fluctuations in incoming pressure, system overpressure, and potential thermal expansions without risking safety. It's also common for operational pressures to be rounded to standard increments that fit with existing equipment and codes. Therefore, 125 psig serves as a practical and safe design pressure that aligns with industry standards. This decision supports the prevention of equipment failure or hazards during operation.