Which component of the B-51 code deals with the inspection and repair of boilers?

The correct choice is the option that focuses on standards specifically related to boilers and their associated components. This section establishes comprehensive guidelines and requirements for the construction and operational safety of boilers, ensuring they meet regulated safety standards. It encompasses various aspects of boiler design, maintenance, and safety to ensure that the equipment operates efficiently and without risk of failure.

In contrast, while operational guidelines may address general practices, they do not specifically encompass the detailed standards for boilers. Pressure vessel compliance relates more to the adherence to codes governing the pressure vessels broadly, which can include boilers but is not limited to just that. The repairs and alterations section typically provides protocols for handling modifications or repairs but does not cover the overall standards for boiler construction and operational procedures as thoroughly as the chosen answer does. Thus, the focus on standards for boilers and related components is what makes this option the most appropriate.