In this table, a change to an requires that the entire written procedure be re-qualified by demonstration . A change to a Nonessential Variable does not require re-qualification, though the written procedure itself must be revised or amended to reflect the change.
to remember:
Article 9 is unique because it does not mandate a detailed written procedure for direct visual examination (unlike RT or UT). However, for remote visual examination, a procedure is required. Practical wisdom suggests: asme section v article 9
Defects cannot be found in the dark. Article 9 sets explicit minimum light intensities measured at the examination surface: In this table, a change to an requires
Inspectors must be capable of distinguishing between colors or shades of gray. This test is typically required every three years to ensure the inspector can differentiate contrast changes on the test surface. Direct vs. Remote Visual Examination However, for remote visual examination, a procedure is