During a boiler inspection, what status should the main steam stop valves be in?

In the context of a boiler inspection, having the main steam stop valves closed, locked, and tagged is critical for maintaining safety and ensuring that the inspection can be carried out without risk of accidental steam release. This status indicates that the valves are securely in a position that prevents any flow of steam, which is essential for the safety of personnel conducting the inspection.

When the valves are closed, this prevents the sudden release of high-pressure steam that could cause severe injuries or damage during the inspection process. Locking and tagging the valves further enhances safety protocols, as it notifies all personnel that the valves should not be operated and protects against unauthorized adjustments.

This approach is consistent with standard safety practices in boiler operations, emphasizing the importance of keeping the equipment in a secure and safe state during maintenance or inspection situations. This practice helps ensure that operations can be resumed safely once the inspection is complete.