Article 9 defines the procedures for visual examination when specified by a referencing code section (such as Section VIII for pressure vessels or B31.3 for process piping). It serves as a procedural guide ("how to") rather than an acceptance standard ("pass/fail"); acceptance criteria are always found in the referencing code. Common applications include: Weld Inspection:
A mandatory clause requiring surfaces to be clean, dry, and free of contaminants like grease, scale, or weld spatter that could mask flaws. 2. Personnel Qualifications asme section v article 9
: Surfaces should typically be in the as-welded, as-rolled, or as-cast condition. However, they must be clean and free from dirt, scale, or spatter that could mask defects. Essential Variables Article 9 defines the procedures for visual examination
For the NDE professional, mastering Article 9 means understanding its limits (no acceptance criteria) and its power (the most frequent and essential examination in any pressure equipment fabrication). Essential Variables For the NDE professional
covers the requirements for Visual Examination (VT) .
English 
German