What is the only thing that can be measured at its thinnest point to really determine the condition of a furnace wall?

To determine the condition of a furnace wall accurately, measuring the wall thickness at its thinnest point is essential. The reason for this is that the thinnest section of the wall is most susceptible to wear, erosion, and degradation over time due to the extreme conditions within a furnace. This measurement provides a clear indication of whether the structural integrity of the furnace wall is still adequate to contain the internal environment and perform its function safely.

Wall thickness assessments are critical for identifying potential weak spots that could lead to failures or leaks. Regular monitoring ensures that maintenance can be conducted before significant issues arise, helping to prevent accidents and ensure safe operation.

While surface integrity, temperature readings, and pressure levels all contribute valuable information regarding the performance and safety of a furnace, they do not directly assess the physical condition of the furnace wall's material. Surface integrity may indicate wear but does not provide a quantifiable measure of structural integrity like wall thickness does. Temperature and pressure readings are important for operational efficiency but are not direct indicators of physical deterioration in the materials making up the furnace wall.