Asme Section V Article 9 May 2026

ASME Section V, Article 9 is not merely a “common sense” checklist. It is a rigorous, enforceable standard that demands documented qualification, controlled lighting, precise viewing geometry, and traceability. When properly applied, it catches surface-breaking discontinuities early, prevents unnecessary rework, and ensures that more advanced NDE methods are performed on properly prepared surfaces. Ignoring its requirements is an invitation to rework, code violations, and potential in-service failures.

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). asme section v article 9

Key takeaway: Article 9 tells you how to look; the construction code tells you what is acceptable. Never confuse the two. ASME Section V, Article 9 is not merely

ASME Section V is the section of the Boiler and Pressure Vessel Code (BPVC) dedicated to Nondestructive Examination (NDE). Article 9 specifically addresses the requirements for Visual Examination (VT). ASME Section V is the section of the

Unlike other NDE methods (like Ultrasonic or Radiographic testing) that look inside the material, Visual Examination is used to determine the surface condition of a component, the alignment of mating surfaces, or the presence of leaks.

You cannot rush a Visual Exam. The examiner must allow adequate time for retinal persistence—the physiological phenomenon where the eye continues to see an image for a fraction of a second after looking away. Article 9 requires sufficient dwell time to allow the eye to scan the surface methodically. Standard practice is a scan rate not exceeding 2 inches per second, though the Code leaves the exact timing to the procedure.