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).

Key takeaway: Article 9 tells you how to look; the construction code tells you what is acceptable. Never confuse the two.

Article 9 gives interpretation rules and acceptance thresholds tied to type, size, and distribution of indications. Key points commonly applied (refer to the Code for exact values and tables): asme section v article 9

Exact numeric limits vary with weld type, thickness, and code edition — always consult the current ASME Section V Article 9 tables and supplementary notes.

Article 9 applies when the referencing Code Section (like ASME Section I, III, or VIII) specifies Visual Examination.

Proper qualification records (date of test, results, examiner signature) must be maintained for the duration of employment. ASME Section V, Article 9 is not merely

The Pitfall: Many facilities qualify an examiner once upon hiring and never recertify them annually, leading to an ASME audit finding.

The examiner must be familiar with the specific weld geometry, base material, and the acceptance criteria of the referencing Code Section.

Article 9 establishes the minimum requirements for visual examination of materials, components, and welds. It applies to visual examination performed as part of mandatory code examinations (e.g., pressure vessels, piping, boilers). Exact numeric limits vary with weld type, thickness,

It is vital to understand how Article 9 interacts with ASME Section V Article 10 (Liquid Penetrant Examination - PT) .

Rule: Article 10 requires that a Visual Examination (per Article 9) be performed before applying penetrant. Why? If a large crack is visible without PT, the examiner must reject the part immediately. Applying PT is for fine indications, not gross defects.