Maritime and Marine NDT Inspection Services
Atlantis NDT performs maritime NDT on shipyard welds, hull structure and offshore structures: VT, MT and PT for surface defects, UT and PAUT for weld volume and plate thickness, with reports reviewed by an ASNT NDT Level III.
What maritime NDT services cover
Maritime NDT examines welds in new construction and repair, hull plating and structure, and offshore structures. Visual examination comes first on every weld, MT or PT finds surface-breaking cracks, and UT or PAUT examines weld volume and measures plate thickness, with TOFD where the specification calls for it. Atlantis NDT mobilises technicians to shipyards, drydocks and ports anywhere in the USA.
Class surveys and thickness measurement
Hull thickness measurements that support a classification survey are normally taken by a firm the classification society has approved as a service supplier: IACS Unified Requirement Z17, Procedural Requirements for Service Suppliers, includes specific provisions for firms engaged in thickness measurements (UR Z17). Before ordering gauging for a class survey, confirm with the attending classification society which approval the measurements need; acceptance of the results is the attending surveyor's decision.
For NDT on new construction of classed ships and offshore structures, IACS UR W35 sets requirements for NDT suppliers, including the Level 3 who approves procedures: see maritime NDT consulting.
Atlantis NDT structures its marine reports to the content of IACS Recommendation No. 20, IACS UR W11 and IMO MSC.1/Circ.1409 where they apply, for vessels classed with ABS, DNV, Lloyd's Register, Bureau Veritas or another society.
Sources: IACS UR Z17, Procedural Requirements for Service Suppliers; IACS UR W35.
What you receive
- Examination records per weld or area: method, procedure, extent and result, against your weld map or hull drawing
- Indications located and sized, and evaluated against the rules or specification you name
- Thickness readings tabulated against the locations on your drawing
- Technician certification and equipment calibration records
- A report reviewed by an ASNT NDT Level III before it is issued
Where we work: nationwide. Technicians are mobilised to your site anywhere in the USA; apart from the Houston office there is no local office, so mobilisation is planned and quoted for each job.
Maritime NDT services: questions
Which NDT methods are used on shipyard welds?
Visual examination on every weld, MT or PT for surface cracks, and UT or PAUT for volumetric examination where the rules or the specification call for it. The class rules or the owner's specification set the extent of examination and the acceptance criteria.
Who accepts the NDT results on a classed vessel?
The attending class surveyor. Atlantis NDT reports the examination against the rules or specification you name, reviewed by an ASNT NDT Level III; acceptance of the results is the surveyor's decision.
What do you need from us to quote shipyard NDT?
The vessel or structure, the weld map or hull drawings, materials and thicknesses, the rules or specification and acceptance criteria, access, the yard or port location and your dates. Every job is quoted on request, and we reply within one business day.
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Speak to an ASNT NDT Level III
Discuss your inspection requirements with Atlantis NDT. Include the asset, method, location and documents you need reviewed.