A high-pressure boiler operates at a pressure above which of the following PSI levels?

A high-pressure boiler is defined as one that operates above 15 psi. This classification is based on safety standards and regulations that distinguish between low-pressure and high-pressure systems. The significance of the 15 psi threshold is crucial because it marks the point where additional regulations and safety measures come into play, reflecting the increased risks associated with higher pressure systems. As the pressure increases, so do the risks of mechanical failures or accidents, hence the need for more stringent inspections, maintenance protocols, and operational training for engineers.

This definition aligns with industry standards and ensures that operators are aware of the specific requirements necessary for safely managing higher-pressure systems, further highlighting the importance of the 15 psi level in boiler operation classifications.