Visual Testing in Marine & Shipbuilding: What It Finds, What It Misses, and What Governs It
What VT is actually used for in marine & shipbuilding
Every class survey is anchored in visual examination — structure, coatings in ballast tanks, and the close-up surveys that scaffolding and rafting exist to enable.
How VT works
Visual testing is the examination every other method is deployed against: direct or remote observation under controlled lighting and access, judged against written acceptance criteria. It finds the majority of reportable conditions in most programmes — weld profile, corrosion, mechanical damage, coating breakdown, leakage evidence — and it decides where volumetric examination is worth performing.
What VT will not do
What VT will not do: see beneath the surface, quantify wall loss, or substitute for a volumetric method where the code requires one. Its weakness is human rather than physical — inconsistent lighting, inadequate access, and acceptance criteria applied from memory rather than from the document.
The marine & shipbuilding assets this applies to
Hull structure and plating, ballast and cargo tanks, propulsion and shafting, deck machinery, and the yard's own new-construction welding.
The damage mechanisms driving the examination
Fatigue at structural details, corrosion in ballast spaces and at the waterline, coating breakdown, and construction defects that surface as in-service cracking.
What governs acceptance
Classification societies (ABS above all in US work) for commercial survey and acceptance; NAVSEA technical publications on naval work, with qualification layered over SNT-TC-1A. On the method side: ASME Section V Article 9; AWS D1.1 for structural acceptance; API 510/570/653 for in-service external and internal examination; ASME B31.3 for process piping. An examination that is technically sound but performed outside the governing regime is not an examination anyone will accept, which is why the code family matters as much as the technique.
How Atlantis delivers VT in this sector
Atlantis mobilises examination teams to your site under Atlantis procedures with ASNT Level III oversight — we do not claim a depot or laboratory in every market, and say so plainly. What you receive is the examination performed to a qualified procedure, findings evaluated against the acceptance criteria your contract names, and records structured to survive a client audit years later.
Visual Testing services · VT training and certification · Marine & Shipbuilding programme consulting · Marine & Shipbuilding NDT training · scope a VT examination.
VT in other sectors
Refining · Petrochemical · LNG · Offshore · Pipeline · Aviation & Aerospace.