According to ASME Section 9, how frequently must visual examination personnel undergo a vision test?

In accordance with ASME Section IX, visual examination personnel are required to undergo a vision test annually. This annual requirement is put in place to ensure that individuals responsible for visual inspection maintain an acceptable level of vision, which is crucial for accurately identifying defects and ensuring the quality of welds.

Maintaining good eyesight is essential for visual inspection, as inspectors must detect minor discontinuities, surface imperfections, and other defects that may affect the integrity of the welded joint. By mandating annual vision tests, the standard helps to ensure that inspectors are consistently capable of performing their duties effectively.

While there are other intervals suggested in different contexts—like biennial or more frequent checks for safety-critical positions—annual testing is the standard established for visual examination personnel in this particular ASME guideline. This approach balances the need for inspection quality with practical implementation, ensuring that personnel remain competent in their inspection abilities year after year.