When assessing the condition of the refractory lining, what is the importance of checking the underlying base metal?

Checking the underlying base metal when assessing the condition of the refractory lining is crucial for ensuring the vessel's integrity. The refractory lining is designed to provide thermal protection and insulation, preventing heat damage to the base metal of the pressure vessel. If the refractory lining is deteriorating, it can lead to excessive thermal loads on the base metal, resulting in corrosion, weakening, or even failure of the vessel structure over time.

If the integrity of the base metal is compromised, it can lead to leaks, cracks, or other serious issues that could endanger the overall safety of the vessel and those working with it. Routine inspections that include evaluating the condition of both the refractory lining and the underlying base metal are essential in maintaining operational safety and compliance with industry standards. This assessment ensures that any potential problems are identified and addressed promptly, enhancing the reliability and longevity of the pressure vessel.