Underwater Inspection
Comprehensive hull, propeller, and subsea structural surveys.
Comprehensive hull, propeller, and subsea structural surveys.
Underwater Inspection & NDT Hull Profiling
Class-approved in-water surveys, ultrasonic thickness testing, and subsea CCTV imaging.
Maintaining vessel seaworthiness and structural integrity requires continuous, non-destructive subsea verification approved by premier marine classification societies.
Chow Marine provides certified In-Water Surveys in Lieu of Drydocking (UWILD) utilizing calibrated ultrasonic thickness (UT) gauging equipment, high-definition closed-circuit subsea television, and magnetic particle testing (MPI).
Our inspection dive teams and mini-ROVs evaluate rudder pintle clearances, tailshaft seal integrity, propeller blade cavitation erosion, sea chest intake condition, and structural weld seams along flat-bottom and vertical side shells. Real-time video feeds are piped directly to top-side client superintendents and class surveyors with two-way audio communications.
Comprehensive inspection reports include calibrated ultrasonic plate thickness plots, corrosion pit depth profiling, high-resolution imagery, and formal engineering recommendations adhering strictly to IACS, Lloyd's Register, ABS, and DNV standards.
Pre-Dive Classification Review
Alignment with attending classification society surveyors, review of vessel structural drawings, and safety permit sign-off.
Subsea Video & Visual Survey
Systematic visual inspection of sea chest grates, hull plating, propeller blades, and steering gear with HD surface-fed video.
Calibrated NDT Hull Gauging
Ultrasonic thickness measurements of keel plates, wind/water strakes, and suspected wasted areas using calibrated A-scan gauges.
Engineering Class Deliverable
Delivery of certified comprehensive inspection binder, digital video archive, and surveyor-stamped clearance documentation.
| Classification Approvals | ABS / Lloyd's / DNV / Bureau Veritas |
| NDT Methods | Ultrasonic (UT), Magnetic (MPI), Eddy Current |
| Visual Capture | 4K Ultra-Low-Light Subsea CCTV |
| Depth Rating | Surface to 100m Commercial Diving |
| Report Delivery | Preliminary < 4 Hours / Final 24 Hours |
Emergency UWILD Class Survey for 730-ft Great Lakes Freighter
Full in-water hull inspection and ultrasonic thickness testing of 140 plate locations at Hamilton Pier 14 following minor grounding incident.
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Is in-water inspection accepted by all major classification societies?
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Is in-water inspection accepted by all major classification societies?
Yes. Chow Marine holds certifications from all major IACS societies (ABS, Lloyd's Register, DNV, Bureau Veritas) to conduct formal UWILD surveys in lieu of drydocking.
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Can ultrasonic thickness testing be conducted through marine coatings?
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Can ultrasonic thickness testing be conducted through marine coatings?
Yes. We utilize multiple-echo digital ultrasonic gauges that accurately measure steel plate thickness through sound protective paint coatings without requiring coating removal.
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How quickly can your inspection team mobilize to Great Lakes ports?
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How quickly can your inspection team mobilize to Great Lakes ports?
Our Hamilton-based mobile dive inspection units maintain 24/7 readiness and can mobilize to any port along Lake Ontario, Lake Erie, or the Welland Canal within 2 to 4 hours.
Ready To Mobilize Crew & Tooling?
Connect directly with our Hamilton operations superintendent for emergency rapid mobilization, site evaluation, and firm engineering proposals.