MGExp

Asme Section V Article 9

ASME Section V, Article 9: Visual Examination The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC) is the global standard for the design, fabrication, and inspection of pressure-retaining equipment. Within this framework, ASME Section V focuses on Non-Destructive Examination (NDE) methods. specifically governs Visual Examination (VT)

, providing the essential methods and requirements for inspections that use human senses—aided or unaided—to detect surface defects 1. Scope and Applicability

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:

Detecting surface cracks, porosity, lack of fusion, and improper geometry. Component Integrity:

Identifying corrosion, erosion, and physical damage in valves, boilers, and piping. Leak Testing: Monitoring for visible leaks during pressure tests. 2. General Requirements for Procedures

Under T-921, visual examinations must be performed according to a written procedure

. This procedure must be demonstrated to the satisfaction of the Inspector and include specific variables categorized as essential or non-essential: asme section v article 9

ASME V Article 9: Visual Examination Guide | PDF | Lighting - Scribd

ASME Section V, Article 9, provides the mandatory requirements for Visual Examination (VT), a critical non-destructive examination (NDE) method used to verify the quality of welds and pressure-retaining components. Unlike other NDE methods that require complex machinery, Article 9 focuses on human observation, often aided by optical tools, to detect surface discontinuities like cracks, porosity, and improper geometry. 1. Scope and General Requirements (T-910)

Article 9 establishes the methods, procedures, and qualifications necessary for visual examination.

Purpose: To identify surface defects, corrosion, or misalignments that could compromise the safety of pressure vessels, boilers, or piping.

Written Procedures: All examinations must be performed according to a documented procedure that specifies lighting levels, viewing angles, and equipment used.

Demonstration: The procedure must be demonstrated to show it can detect specific discontinuities (e.g., a 1/32" black line on a neutral gray background). 2. Personnel Qualifications (T-922) ASME Section V, Article 9: Visual Examination The

The effectiveness of Article 9 relies heavily on the skill of the inspector.

Certification: Personnel must be qualified in accordance with employer-certified programs, often referencing ASNT SNT-TC-1A or similar standards.

Vision Exams: Inspectors are required to pass annual vision tests, typically using Jaeger or Snellen charts for near/far vision and Ishihara plates for color vision. 3. Examination Techniques

Article 9 categorizes visual testing into two primary techniques:

Direct Visual Examination: Performed when the eye can be placed within 24 inches (600 mm) of the surface at an angle not less than 30 degrees.

Remote Visual Examination: Used when direct access is restricted; this involves borescopes, mirrors, or video cameras to project images for the inspector. Limitations and common pitfalls

Lighting Requirements: Minimum illumination of 100 foot-candles (1,000 lux) is typically required on the examination surface to ensure fine defects are visible. 4. Documentation and Evaluation

A formal report is a mandatory output of an Article 9 examination.

Limitations and common pitfalls

D. Record Keeping (T-924)

Proper qualification records (date of test, results, examiner signature) must be maintained for the duration of employment.

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

9. Article 9 for In-Service (Post Construction) vs. New Build

There is a persistent confusion between ASME Section V (New Construction) and API 570/510 (In-Service).

If you are inspecting a 20-year-old vessel for corrosion, you use the tools of Article 9, but the rules of the repair code (NBIC or API).

T-924 – Illumination

3.2. Procedure Requirements

Visual examination must be performed in accordance with a written procedure. Article 9 requires the procedure to address:

Radiograph evaluation procedure

  1. Verify film identification, exposure data, and acceptance of technique.
  2. Check film and processing quality (base density, contrast, absence of processing artifacts).
  3. Review image quality indicators and verify sensitivity meets required standards for the examined thickness/material.
  4. Systematically inspect film for indications: note location relative to weld, orientation, size, and appearance (shape, density, multiplicity).
  5. Classify indications by type (e.g., porosity, slag, lack of fusion, crack) using characteristic image features.
  6. Measure indications using magnification calibration or measurement standards on film; record linear dimensions or equivalent area.
  7. Compare indications against acceptance criteria (see next section).

3.3. Personnel Qualification

Personnel performing visual examinations must be qualified and certified.