A steam boiler operating at a pressure of __________ or higher is considered a Power Boiler according to ASME standards.

According to ASME (American Society of Mechanical Engineers) standards, a steam boiler is classified as a Power Boiler when it operates at a pressure of 15 psig or higher, which is equivalent to about 100 kPa. This classification is significant because Power Boilers are subject to more stringent design, maintenance, and operational regulations due to the higher pressures they operate under, which can pose increased risks if not managed properly.

By defining the threshold for what constitutes a Power Boiler, the ASME establishes guidelines that ensure safety, reliability, and efficiency in the operation of steam boilers. Operating at lower pressures typically categorizes a boiler differently, often placing it in the affordability range subject to less rigorous standards, while maintaining advantageous safety practices for higher pressure systems like Power Boilers enhances industry standards and improves overall safety for operators and facilities.