With maximum heat input, how much can the pressure rise for a boiler with MAWP up to 60 psi?

The correct choice indicates that with maximum heat input, the expected pressure rise for a boiler with a maximum allowable working pressure (MAWP) of up to 60 psi is 6 psi. This is due to the operating characteristics of boilers, where the pressure increase at maximum heat input is generally established in accordance with safety and operational standards.

In this context, a rise in pressure can occur as the boiler maintains or generates increased steam production. The specified rise of 6 psi is consistent with industry practices and guidelines aimed at ensuring safety and reliability under maximum heat conditions. This means that for a boiler rated at up to 60 psi, the additional allowable pressure increase while running at the highest input setting is controlled and standardized to prevent any undue stress or failure of the boiler system.

Understanding the relationship between heat input and pressure rise is critical for boiler operation since it helps in maintaining consistent performance and ensuring that the system operates within its design specifications.

Other considerations, such as boiler design, thermodynamics, and material limitations, will further inform why the pressure rise does not exceed this range, ensuring safe operation under maximum thermal loads.