Which criteria are used for inspecting the boiler shell or drum?

The criteria for inspecting the boiler shell or drum primarily involve boiler design criteria. This includes checking that the construction, thickness, and integrity of the boiler components align with the established design specifications. These design criteria ensure the boiler can safely withstand the pressures and temperatures during operation, which is crucial for preventing failures and ensuring safe operation.

Inspections based on design criteria examine the materials, welds, supports, and overall structural integrity in relation to the specific operational parameters for which the boiler was designed. Compliance with these criteria is essential for maintaining the safety and reliability of the boiler system.

While safety standards and material specifications are important in the broader context of boiler operation and maintenance, they serve as frameworks or guidelines that inform the design criteria. Efficiency ratings are focused on the performance output of the boiler rather than its structural integrity or safety features. Therefore, the selection of boiler design criteria as the decisive factor for inspection relates directly to maintaining the safe and effective functioning of the boiler shell or drum.