Visual Testing (VT) — Direct + Remote Visual Inspection 2026

Atlantis NDT delivers the complete visual testing curriculum + consulting stack — direct visual examination (DVT), remote visual inspection (RVI), rigid borescope inspection, flexible videoscope inspection, and drone/UAV-based VT. ASME Section V Article 9, AWS D1.1 weld visual acceptance, API 510/570/653 in-service visual inspection compliant. ASNT NDT Level I/II/III VT training + AWS CWI/SCWI preparation + outsourced Level III VT consulting.

VT Method + Equipment

VT is the first-line NDT method — performed before any other method to identify obvious surface conditions. Equipment: visual aids (5-10× magnifier, illuminated loupe, ring light), inspection mirror, borescope (rigid/flexible 4-10 mm OD, articulating tip), videoscope (digital recording, measurement function), drone/UAV (DJI M300/M600 + Zenmuse cameras for elevated visual + IRT). Direct VT requires inspector within 600 mm of surface with light intensity ≥ 1000 lux (per ASME V T-952), eye acuity Jaeger J1 + colour vision verified annually.

Acceptance Criteria + Code

VT acceptance per: ASME Section V Article 9 (general VT); AWS D1.1 + D1.6 Table 6.1 visual weld acceptance (undercut, crater crack, porosity, undersize); API 510 + 570 + 653 in-service visual inspection; ASME PCC-2 repair acceptance; ISO 17637 EU weld visual; NACE SP0188 coating visual + holiday detection. Defect types: porosity, slag, undercut, overlap, incomplete fusion, crater crack, arc strike, weld profile, dimensional non-conformance, surface finish (Ra/Rz).

Remote Visual Inspection (RVI) + Borescope

RVI applies where direct access is impossible: in-service pressure vessel internal, boiler internal, heat exchanger tube bundle (with extension probes), turbine + engine internal inspection, pipe/conduit internal scan. Borescope selection: rigid (best resolution, straight line of sight), flexible video (articulating, internal tortuous path), pan-tilt-zoom remote camera (large vessel internals). Measurement function: stereo + grid + shadow + phase-measurement methods. Atlantis NDT RVI delivery via certified inspector + Level III sign-off + recorded video archived in Atlantis NDT ERP.

Drone + UAV-Based VT

Drone VT extends inspector reach on flare stacks, refinery columns, offshore platforms, transmission towers, wind turbines, ship hull externals, large storage tanks (external + roof). Pilot certification: FAA Part 107 (US), CAA (UK), CASA (AU), local regulator. Code-acceptance per ASME V Article 1 — drone-collected visual data accepted when (a) procedure written + qualified + Level III approved, (b) pilot trained, (c) Level III final disposition. Atlantis Digital Twin platform integrates drone capture into 3D asset model for change-tracking + RBI overlay.

Atlantis NDT VT Procedure Pack + CWI Path

Turn-key VT + CWI pack: written procedure (ASME V Article 9 + AWS D1.1 aligned), technique sheet (per defect class), lighting + magnification verification log, ASNT NDT Level III sign-off, inspector training (96% first-pass via Atlantis Academy) + AWS CWI/SCWI exam prep, free retake-grade backstop. Plus drone pilot certification consulting + RVI equipment specification + borescope operator training.

VT Frequently Asked Questions

Q1: What's the minimum illumination required for direct VT?

A: 1000 lux at the surface per ASME V T-952. Verified with calibrated light meter pre-job. Higher intensity needed for fine surface defect detection.

Q2: How is drone VT data accepted under code?

A: Per ASME V Article 1 — drone-collected data is acceptable when procedure is qualified, pilot trained, Level III signs off final disposition. ASME Section V Subgroup on Computed Imaging has endorsed UAV-based VT for external visual inspection.

Q3: AWS CWI vs ASNT Level II VT — what's the difference?

A: CWI is a welding-specific certification covering visual weld inspection (AWS D1.1/D1.6 acceptance). ASNT VT Level II is broader NDT method certification covering all visual inspection scenarios. Many inspectors hold both. Atlantis Academy trains both paths.

Q4: What's the typical eye-exam requirement?

A: Annual near visual acuity per Jaeger J1 + colour vision (Ishihara) per SNT-TC-1A 2024 + CP-189-2020 + ISO 9712:2021. Records retained in inspector cert file in Atlantis ERP.

Get a free VT consultation. See also VT training, ASNT, MT, PT, Level III consulting.

Why visual examination is a procedure, not a glance

Visual testing fails audits more often than any other method — not because looking is hard, but because the code makes it measurable and most providers do not treat it that way. ASME Section V Article 9 sets minimum illumination at the surface, maximum viewing distance and angle, and demonstrated visual acuity re-tested on a schedule. An Atlantis visual examination records all of it, which is the difference between an inspection and an opinion.

What a visual campaign delivers

Direct visual examination covers weld acceptance to AWS D1.1 and construction-code criteria — profile, undercut, reinforcement, arc strikes — and in-service condition: corrosion under insulation evidence, coating breakdown, support and foundation condition, and the mechanical damage that walkdowns exist to find. Remote visual inspection extends the same discipline through borescopes and crawlers into vessels, tubes and spaces where entry is costly or unsafe, with imagery retained so a finding can be re-examined without re-mobilising.

Where VT sits in an inspection programme

Visual examination is the scoping method: it decides where the volumetric budget goes. A disciplined visual campaign in front of a turnaround routinely reshapes the UT and RT scope — dropping locations that show nothing and adding ones the desk plan missed. Treating VT as a checkbox forfeits exactly that value.

What visual examination cannot do

Nothing subsurface, and nothing the eye cannot resolve at the specified distance and lighting — tight fatigue cracks are routinely invisible until a surface method opens them up. Where cracking is credible, VT identifies the locations and magnetic particle or penetrant confirms; pretending a visual pass rules cracking out is how findings get missed.

Codes and records

Work runs to ASME Section V Article 9, AWS D1.1 for structural welds, and API 510, 570 and 653 in-service visual requirements, with examiner acuity records, illumination verification and procedure control retained against audit. Findings are reported located and photographed, and can feed the client's own system or a 3D asset model so condition history accumulates against the component rather than in scattered PDFs.

Frequently asked questions

Is certified VT really necessary if our engineers already walk the plant?

Walkdowns are valuable and are not examinations. When acceptance is being declared against a code — weld acceptance, in-service condition supporting a run decision — the examiner's certification, vision records and the lighting and distance conditions become part of the evidence, and their absence is a finding in itself.

Can remote visual replace vessel entry?

Often, and increasingly. Where the code or the damage mechanism requires close-up coverage, crawler and borescope work with recorded imagery can satisfy it without entry — but the equivalence has to be established per case, not assumed, and we will say plainly when entry is still the right call.