Jiangsu Yuheng Engineering Testing Co., Ltd. is registered in Nantong, a Jiangsu Province port city on the north bank of the lower Yangtze that hosts a large concentration of shipyards, offshore yards and steel-fabrication facilities serving both new construction and ship-repair work. The firm specialises in non-destructive testing and tightness-testing scopes that support classification society survey requirements on commercial tonnage trading through the East China Sea and the Yangtze River corridor. Ultrasonic hatch-cover testing covers weather-deck closures on bulk carriers and general cargo ships where leak-tightness affects cargo condition and stability, and watertight integrity verification is offered on bulkheads, doors and other compartments where SOLAS tightness requirements apply. Non-destructive testing techniques cover ultrasonic, magnetic particle, dye penetrant and visual examination of welds and structural members during new construction, repair and routine periodical inspection, with weld-quality reports covering hull, deck and tank structures and inspection documentation supporting shipyard quality-control programmes. Jiangsu Yuheng holds service supplier recognition under the American Bureau of Shipping and the China Classification Society, allowing reports issued from its NDT and tightness campaigns to be considered during periodical, intermediate and special surveys carried out under SOLAS and class rules. Field technicians work with calibrated ultrasonic flaw detectors, thickness gauges and reference test pieces conforming to relevant ISO and class testing standards, with results documented in formats accepted by attending surveyors. Customers include shipyards, ship managers, owners and class surveyors who require objective, documented test evidence on hull, structural and cargo-hold components during periodical attendances at Nantong-area yards and surrounding Yangtze anchorages.