Asme Section V Article 9 Link -

ASME Section V, Article 9 provides the foundational requirements for Visual Examination (VT) within the ASME Boiler and Pressure Vessel Code (BPVC). While other articles in Section V cover more technical NDE methods like radiography or ultrasonic testing, Article 9 governs the most common and often first step of any inspection: using the human eye (or optical aids) to find surface-level defects. 1. Scope and Core Requirements

The "Human Variable": Because the inspector is the instrument, they must pass annual vision tests using standard tools like Jaeger or Snellen charts to prove their visual acuity. Why It Matters

• The radiographs must be evaluated by a qualified Level I, II, or III Radiographic Interpreter.
• The evaluation must include:

  2. Equipment and Lighting (Crucial Section)

  One of the most critical aspects of Article 9 is the specification of lighting and visual acuity. asme section v article 9

  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).

  5. Evaluation of Indications

  Article 9 defines how to look, but it generally does not define acceptance criteria. The acceptance criteria come from the referencing Code Section (e.g., Section VIII, Div 1, or B31.3). ASME Section V, Article 9 provides the foundational

  A. Visual Acuity (T-921(a))

  Examiners must demonstrate vision capability with at least one eye (either natural or corrected) of:

  Personnel conducting these exams must be qualified according to the referencing code section. Key requirements include: The radiographs must be evaluated by a qualified

  under clause T-940. Surfaces must be clean, dry, and free from grease, weld spatter, or flux that could hide defects. Lighting Intensity