Which of the following is an example of a boiler alteration?

Increasing the maximum allowable working pressure (MAWP) is a definitive example of a boiler alteration because it modifies the design parameters and operational capabilities of the boiler. Altering the MAWP involves technical changes to the boiler's construction, materials, or safety controls, which typically requires a thorough engineering assessment and re-certification to ensure safety and compliance with applicable codes and regulations. This type of change can impact the overall safety and integrity of the boiler system, and because of this significance, it falls under the category of alterations that must be formally documented and inspected.

Changing the location of the boiler, while requiring careful consideration and potentially needing modifications to utilities and connections, typically does not alter the design or specifications of the boiler itself. Regular cleaning of boiler components is essential maintenance and does not constitute an alteration. Replacing a damaged boiler part may involve repairs, but unless it results in a change to the boiler's design or capability, it does not qualify as an alteration in the same way that increasing the MAWP does.