Which solvent should be used to clean a part before dye penetrant inspection?

Using a volatile petroleum-based solvent to clean a part before dye penetrant inspection is appropriate because these solvents effectively remove surface contamination such as oil, grease, dirt, and other unwanted materials that could interfere with the penetrant's ability to identify defects. Proper surface preparation is crucial in dye penetrant inspection, as any residual contaminants can prevent the penetrant from adequately entering any cracks or surface irregularities.

The use of a volatile solvent is beneficial, as it evaporates quickly, minimizing the risk of leaving behind any residue that could affect the inspection results. In contrast, other types of solvents mentioned do not offer the same level of efficiency or effectiveness for this specific cleaning process. Water-based solvents, for example, may not be able to dissolve certain oils or contaminants as effectively as petroleum-based solvents, while vegetable-based solvents also typically lack the necessary cleaning power for comprehensive surface preparation in the context of dye penetrant inspections.