Which aspect is critical to assess when examining a metallic liner’s integrity?

When examining a metallic liner’s integrity, assessing the condition of the base metal is crucial because it directly influences the liner's ability to serve its intended purpose effectively. The base metal provides the necessary structural support and corrosion resistance that ensures the overall functionality and safety of the pressure vessel.

A compromised base metal can lead to failures, such as cracking or rupturing, which may not only impact the liner but also the entire vessel's integrity. Identifying any signs of deterioration, such as corrosion, pitting, or material loss, allows for timely maintenance or replacement, thus preventing potential catastrophic failures.

While factors like current operating pressure, age of the vessel, and visual surface finish also play roles in the overall assessment of a pressure vessel, they are secondary to the fundamental condition of the base metal itself since the base metal's integrity dictates how well the liner can perform under operational stresses and environmental factors.