Among all the non destructive tests we discussed previously there’s one that usually is incorporated into our daily work or checklists, in-process checking which is Visual Examination or Visual Testing (VT).
The following are some of the known international standards made reference for VT:
1. ASME Boiler and Pressure Vessel Code (BPVC): Section V outlines Nondestructive Examination methods, including visual inspection.
2. ISO 8501-1: Preparation of steel substrates before application of paints and related products – Visual assessment of surface cleanliness.
3. ISO 17637: Non-destructive testing of welds – Visual testing of fusion-welded joints.
4. AWS D1.1/D1.1M: Structural Welding Code – Steel. This standard includes visual inspection requirements for welded joints.
5. EN ISO 5817: Fusion-welded joints in steel, nickel, titanium, and their alloys (beam welding excluded) – Quality levels for imperfections.
Always check the specific standards relevant to your industry and application, as visual examination criteria may vary based on materials, processes, and end-use requirements. Visual examination, as per standards like ASME and ASTM, involves several steps:
1. Ensure proper lighting, cleanliness, and accessibility for inspection.
2. Review relevant drawings, specifications, and procedures before beginning the examination.
3. Clean the surface to be examined, removing any contaminants or coatings that could hinder inspection.
4. Use appropriate tools, such as magnifying glasses or borescopes, to visually examine the surface for defects like cracks, corrosion, or discontinuities.
5. Compare the observed conditions with specified acceptance criteria outlined in the relevant standards.
6. Document findings accurately, noting the location, size, and characteristics of any identified defects.
7. Prepare a comprehensive inspection report, including details of the examination, any non-conformities, and recommendations for further action.
8. Confirm that the inspection results meet the required standards and specifications.
9. If applicable, certify the product or component based on the successful visual examination.
10. Ensure proper handling and disposition of the inspected items, including any necessary repairs or rework.
Always refer to the specific standards and procedures applicable to the material or component being examined for detailed guidance.
Cheers 🥂 MFR