Nantong Diweier NDT Co., Ltd. is a non-destructive testing services firm based in Nantong, Jiangsu Province, focused on the shipbuilding and ship-repair markets concentrated along the lower Yangtze River. The Nantong cluster hosts a dense network of new construction and repair yards, and Diweier supports these facilities and the shipowners using them with statutory and class-driven inspection work on merchant tonnage and offshore units. Core technical services concentrate on in-water surveys and condition monitoring, allowing certified divers and NDT technicians to carry out routine bottom inspections and rudder, propeller and sea-chest examinations on classed vessels in lieu of drydocking where regulations permit. Complementary capabilities cover conventional non-destructive examination methods such as ultrasonic testing, magnetic particle inspection, dye penetrant testing and radiographic testing applied to welds, primary structure, machinery components and repair locations in support of shipyard quality control, owner-driven hull surveys and class-witnessed renewal works. The company holds approvals from ABS, DNV and Korean Register, which allows reports issued by Diweier technicians to be accepted for statutory and class purposes on a wide range of bulk carriers, tankers, containerships and special-purpose tonnage. With its Nantong location, Diweier is positioned to provide rapid attendance to yards and anchorages along the Yangtze estuary, supporting both planned dockings and unscheduled damage investigations for owners and managers operating in the Jiangsu shipbuilding region.