What is the minimum light intensity required for performing a visual examination according to ASME Section V Article 9?

The minimum light intensity required for performing a visual examination, according to ASME Section V Article 9, is 100 foot candles or 1000 lux. This requirement ensures that the inspector has adequate lighting to accurately observe the details of the welds or the surfaces being evaluated. Proper lighting is critical in visual examinations as it helps improve the visibility of potential defects, surface irregularities, and other important features that need to be assessed for quality assurance.

By setting the minimum level of 100 foot candles, it provides a standardized measure that helps ensure consistency and thoroughness in inspections across different environments and situations. Adequate lighting minimizes the chances of missing critical imperfections that could affect the integrity of the welded components. This is particularly important in high-stakes industries where the reliability of welds can have significant safety implications.