The American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (BPVC) is the standard for safety, reliability, and quality in the pressure equipment industry. Within this framework, ASME Section V governs non-destructive examination (NDE) methods.
: Performed when the eye can be placed within 24 inches (600 mm) of the surface at an angle not less than 30 degrees.
Adapted from Article 9 Table T-921.
: Also known as "candling," this involves using artificial light to shine through translucent materials (like laminates) to detect thickness variations or subsurface flaws. 3. Critical Variables and Equipment Illumination : A minimum light intensity of 100 footcandles (1000 lux) asme section v article 9
This change elevates surface preparation to a formal, mandatory step, ensuring that the examination is not performed over contaminants that could mask or be mistaken for genuine discontinuities.
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ASME Section V, Article 9 defines requirements for visual examination (VT), mandating written procedures, specific lighting intensities of 100 footcandles (1,000 lux), and mandatory surface preparation. The standard covers direct, remote, and translucent techniques, requiring personnel to demonstrate capability to detect fine lines or specific imperfections. Detailed information on Article 9 standards is available on Scribd . The American Society of Mechanical Engineers (ASME) Boiler
This article provides an in-depth overview of Article 9 requirements, procedures, personnel qualifications, and compliance strategies for 2026. 1. What is ASME Section V, Article 9?
: This article provides requirements for the radiographic examination of welds in boiler and pressure vessel components.
: 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 Adapted from Article 9 Table T-921
Article 9 also outlines how an inspection procedure itself is qualified. When required by the referencing Code Section, a visual examination procedure must be demonstrated to be effective. The demonstration can be performed using a fine line , an artificial imperfection, or a simulated condition located on a surface similar to the one to be examined. This ensures the procedure can reliably detect a small, relevant flaw.
All visual examinations must be performed according to a written procedure that includes specific variables like the type of surface condition, the method of examination, and the equipment used.
: 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
Altering the steps used to clean the component after the inspection is complete. 3. Types of Visual Examination Techniques