What precaution should be taken when performing maintenance on a boiler?

When performing maintenance on a boiler, ensuring that it is shut down and depressurized is a crucial safety measure. This step prevents any accidental release of steam or hot water, which can cause serious injuries. A depressurized and offline boiler eliminates the risks associated with working on pressurized systems, allowing maintenance personnel to inspect, repair, or service the equipment more safely.

Prioritizing safety control measures, such as shutting down the boiler completely, ensures that there are no unexpected pressures or temperatures that could lead to hazardous situations. This practice aligns with industry standards and safety regulations, emphasizing the importance of secure working conditions.

While other choices may seem relevant, they do not prioritize safety in the same manner. For example, keeping the boiler operating during maintenance poses significant risks, and filling the boiler with water before performing work does not address potential pressure hazards. Similarly, wearing protective gear is important, but it is ineffective if the system has not been properly depressedurized. Thus, shutting down and depressurizing the boiler is the most responsible precaution to take during maintenance.