During annual inspections, what should be checked in hot oil heater tubes?

During annual inspections of hot oil heater tubes, checking for internal deposits is crucial because these deposits can significantly impair the efficiency and safety of the heating system. Over time, various materials such as carbon, debris, or other combustion byproducts can accumulate inside the tubes, reducing the effective heat transfer area and limiting the flow of the heating medium. If left unchecked, these internal deposits can lead to overheating, potential tube failure, or even hazardous situations like fires.

Monitoring for internal deposits is essential for maintaining the operational efficiency of the system, preventing breakdowns, and ensuring safe operation. While external corrosion, pressure seals, and heat exchange efficiency are also important aspects of inspection, the presence of internal deposits specifically impacts the immediate performance and safety of the heater tubes.