Which of the following is a common method for cleaning vessels prior to inspection?

Steam cleaning is a common method for cleaning pressure vessels prior to inspection because it effectively removes dirt, grease, and other contaminants that could obscure visual inspection and surface examinations. This method uses high-temperature steam to sanitize surfaces without damaging the structural integrity of the vessel.

This technique is particularly advantageous because it minimizes the need for harsh chemicals that could leave residues or further complicate the inspection process. Additionally, steam cleaning is effective in flushing out residue from the interior surfaces of vessels, ensuring inspectors can accurately assess the condition of the materials.

While other methods such as sandblasting, acid washing, and hand scraping can also be effective in certain contexts, they may not be as versatile or gentle as steam cleaning. Sandblasting can remove protective coatings and cause surface roughening, acid washing carries risks of chemical damage, and hand scraping can be labor-intensive and may not reach all areas effectively. Thus, steam cleaning stands out as a preferred method for cleaning due to its effectiveness and safety in preparing vessels for a thorough inspection.