What is covered by NACE SP0178 in terms of surface preparation?

NACE SP0178 addresses the design and surface finish practices specifically for tanks and vessels intended for immersion service. This standard outlines the factors to consider to ensure that these structures are adequately protected against corrosion when submerged in liquid environments. It emphasizes appropriate surface preparation techniques, coating selections, and overall design considerations that are critical to the longevity and performance of coated surfaces in immersion conditions.

The other choices, while related to surface preparation in some contexts, do not fall under the specific purview of NACE SP0178. Options regarding power tool cleaning or dry coat thickness measurement pertain to other standards that focus on different aspects of surface preparation and coatings application. Thus, the emphasis of NACE SP0178 is uniquely on how to prepare and finish the surfaces of tanks and vessels the right way for immersion, making option C the correct choice.