What defines the MAWP of a high pressure boiler?

The Maximum Allowable Working Pressure (MAWP) of a high-pressure boiler is defined as being more than 15 psi. This classification is essential because it distinguishes high-pressure boilers from low-pressure boilers, which typically operate at pressures of 15 psi or below.

Understanding this definition is crucial for safety and regulatory compliance within the industry. High-pressure boilers must adhere to specific standards and practices to ensure their safe operation, such as rigorous inspections and maintenance procedures, due to the elevated risks associated with operating at higher pressures. The delineation at 15 psi is widely accepted in industry standards and reflects the necessary precautions that must be taken when dealing with higher pressure vessels.

In this context, any value at or below 15 psi could not qualify a boiler as high pressure, which reinforces why the correct answer is one that indicates a pressure above this threshold.