What is the standard operational pressure for high-pressure boilers?

High-pressure boilers are defined by their operational pressures, which significantly influence their design, operation, and safety considerations. The correct understanding is that high-pressure boilers operate at pressures above 15 psi, and one of the distinguishing factors is the Boiler Horsepower (BHP). Boilers that exceed 15 psi typically also have a rating exceeding 6 BHP, making them suitable for numerous industrial and commercial applications where higher thermal outputs are required.

This classification is important because it determines the regulatory standards the boiler must meet for safety and operation. Higher pressure environments require more robust components and stringent safety protocols to prevent failures, which underscores the critical nature of designing and operating them at these specified pressures.

The other options do not accurately represent the operational standards for high-pressure boilers. For instance, pressures below 10 psi or within the 10-15 psi range fall under low-pressure boilers, which have markedly different operational and safety requirements. Specifying an exact pressure of 20 psi also fails to encompass the broader category that includes a range of pressures above 15 psi, making the choice of just one pressure too restrictive.