Visual Testing (VT)
Visual Testing (VT)
Visual Testing (VT) is the most fundamental and widely applied non-destructive testing method, serving as the first line of inspection for identifying surface defects, workmanship issues, and general condition of components. At Assessfie, our VT services are performed by highly experienced and certified inspectors who detect cracks, corrosion, misalignment, deformation, and welding defects—often before more advanced testing is required. Properly executed VT helps prevent failures, reduce inspection costs, and improve overall asset reliability.
How Visual Testing Works
- The component or structure is visually examined under controlled lighting conditions.
- Direct or remote visual aids are used to access difficult or confined areas.
- Surface conditions, weld profiles, alignment, and dimensional conformity are assessed.
- Certified VT inspectors document observations and issue a clear inspection report with recommendations.
Technologies We Use
- Direct Visual Inspection
- Remote Visual Inspection (RVI)
- Borescopes and Video Scopes
- Mirrors, Magnifiers, and Measuring Gauges
- High-resolution Cameras and Lighting Systems
- VT support for site, offshore, and shutdown inspections
Visual Testing Applications in the Oil & Gas Industry
Visual Testing is widely used across all stages of fabrication, installation, and service life. Key applications include:
Weld Inspection — Assessment of weld profile, undercut, overlap, spatter, and surface cracking
Pipelines & Piping Systems — Visual examination of joints, supports, coatings, and alignment
Pressure Vessels & Storage Tanks — Surface corrosion, deformation, and nozzle condition checks
Structural Steel & Fabrication — Inspection of beams, frames, brackets, and bolted connections
Offshore & Marine Structures — Corrosion, coating damage, and splash zone assessment
Maintenance & Shutdown Inspections — Early detection of service-related damage
Pre-Commissioning & Final Acceptance — Verification of workmanship and compliance
Standards & Regulations
Our Visual Testing services are performed in strict accordance with international standards to ensure consistency, reliability, and global acceptance.
International Standards
- ISO 17637 — Visual testing of fusion welds
- ISO 9712 — Qualification and certification of NDT personnel
ASTM Standards
- ASTM E165 — Visual examination guidelines (where applicable)
- ASTM E94 — General inspection practices
Industry-Specific Standards
- API 1104 — Visual inspection of pipeline welds
- API 650 — Visual inspection of storage tanks
- API 570 — In-service piping inspection
- ASME Section V — NDT requirements for pressure equipment
Personnel Qualification Standard
- SNT-TC-1A — Qualification and certification of NDT personnel
