At what stage is the boiler MAWP determined?

The maximum allowable working pressure (MAWP) of a boiler is determined during the design stage of the boiler’s construction, prior to any physical manufacturing or testing. This is based on the design parameters, materials used, and safety factors that need to be applied for safe operation.

However, after the hydrostatic test is conducted, the structural integrity and the ability of the boiler to withstand pressure without failure can be evaluated. It ensures that the design specifications, including the MAWP, are confirmed under actual pressure conditions before the boiler goes into operation. This stage is critical because it serves as a practical verification of the MAWP set during the design phase, and any discrepancies or failures at this point can result in the reassessment of the MAWP.

While the other options may pertain to different aspects related to boiler operation or customization, they do not address the established engineering principles that dictate how the MAWP is officially confirmed through rigorous testing such as the hydrostatic test. Thus, determining MAWP at this stage ensures compliance with safety regulations and operational standards.