What is a common method for detecting small blisters on a vessel's surface?

The most effective method for detecting small blisters on a vessel's surface is through visual inspection with magnification. This technique allows for a detailed examination of the surface, enabling inspectors to identify subtle surface irregularities, such as blisters that may not be visible to the naked eye. Magnification aids in assessing the size, shape, and extent of any faults on the surface.

Feeling the surface with fingers might allow an inspector to detect larger surface flaws or irregular textures, but it lacks the precision necessary for identifying small or subtle features like small blisters. While it may give a rough estimate of the surface condition, it does not provide the detailed oversight that magnification does in identifying critical issues. Thus, relying solely on touch would miss many defects that are visually detectable with the right tools.

Using solvent removal techniques is more suitable for preparing surfaces for inspection or cleaning, rather than for the direct detection of blisters. Electrochemical testing, while valuable in assessing corrosion potential and coating integrity, does not specifically focus on the identification of surface blisters. Instead, it assesses the electrochemical properties of materials, which may not correlate directly with physical surface damage such as blisters.