Visual Testing (VT)
Method Overview
Foundational direct inspection method assessing surface finish, weld profile, corrosion, alignment, and physical damage.
Core Method Specifications
Target Applications & Governing Standards
2 Scopes ConfiguredMethod Limitations & Operational Boundary Conditions
Critical physics limits, thermal envelopes, blind spots, and ASME Sec V / API procedural boundaries for VT.
Heat haze and shimmering thermal convection currents distort optical focal length and resolve clarity over hot piping.
Cannot evaluate internal or subsurface material integrity
None
Direct line-of-sight required: eye or camera sensor angle must be ≥ 30° to the examination surface
- •Tight fatigue cracks or stress corrosion micro-fissures closed by residual compressive stress
- •Internal corrosion thinning, hydrogen blistering, or internal erosion on enclosed pipes and vessels
- •Sub-surface slag inclusions and lack of root fusion hidden beneath weld crown cap
Machining marks, mill scale striations, and die drag lines mistaken for surface fatigue cracks
Apply liquid penetrant to reveal tight surface fissures undetectable by naked optical inspection
Measure remaining wall thickness beneath visible external corrosion scales
Technique-to-OEM Compatibility Matrix
Verified manufacturers, instrument models, and diagnostic portals supporting VT.
Evident Scientific
Global leader in advanced optical, ultrasonic, and radiographic inspection technologies (formerly Olympus Scientific Solutions).
FLIR Systems (Teledyne FLIR)
World benchmark manufacturer of radiometric thermal imaging cameras, optical gas imaging (OGI) leak cameras, acoustic acoustic imagers, and drone payloads under Teledyne Technologies.
Flyability
Swiss pioneer of collision-resilient confined-space inspection drones (Elios series) with protective cage and multi-sensor payloads (UT thickness gauge, LiDAR 3D, and thermal) for tanks, boilers, and chimneystacks.
Emerson (AMS CSI)
Global industrial automation enterprise providing AMS condition monitoring, triaxial vibration analyzers, and laser shaft alignment instrumentation for rotating equipment.
Skydio
Autonomous AI-powered inspection drones (Skydio X10/X2) equipped with 360° computer-vision obstacle avoidance, thermal cameras, and automated 3D scan mapping for critical industrial assets.
Percepto
Autonomous Drone-in-a-Box (Air Max & Air Mobile) and AIM software platform for continuous automated visual, thermal, and optical gas inspection of refineries, mines, and utilities.
Easy Aerial
Tethered and autonomous free-flight drone monitoring systems designed for long-endurance visual testing (DVT) and thermal perimeter monitoring of industrial energy assets.
Fluke Corporation
Fortive subsidiary and world benchmark manufacturer of industrial test tools, thermal imaging cameras, acoustic imaging leak detectors, and portable vibration meters.
Gecko Robotics
Pioneer of wall-climbing magnetic NDT crawlers (TOKA series) that capture millions of ultrasonic thickness readings across boilers, tanks, and pressure vessels for predictive digital twin analysis.
Lincoln Electric
Global leader in arc welding equipment, automated weld tracking, consumable chemistry verification, and CWI welding inspection tools.
Mitcorp
Specialist global designer and manufacturer of high-definition articulating videoscopes, borescopes, and inspection cameras for aerospace, automotive, and power generation.
TALCYON
Pioneer of Acoustic Pulse Reflectometry (APR / APRIS) technology for ultra-fast, non-invasive inspection of heat exchanger tubes, boilers, and fin fans within seconds.
USA Borescopes
Premier American manufacturer and authorized distributor of articulating videoborescopes, fiberscopes, aviation turbine inspection cameras, and pipe push cameras.
Waygate Technologies
OEM Manufacturer for VT inspection systems.
Gradient Lens
OEM Manufacturer for VT inspection systems.