Senhai Marine Co., Ltd. is based in Nantong, Jiangsu Province, providing marine safety and inspection services to commercial vessels calling at Yangtze River estuary ports and along the East China coast. The company brings together life-saving appliance work, fire-fighting equipment servicing, structural inspection and underwater survey capability under a single organisation. Technicians carry out periodical testing of LSA and FFE items, annual servicing of lifeboats and rescue boats with their davits and launching systems, liferaft annual inspections, fire extinguisher recharging, servicing of fixed fire-fighting installations including CO2, foam and water-spray systems, fire hose and hydrant testing and checks on EEBD and SCBA breathing apparatus, immersion suits and lifejackets. Hull and equipment scopes include ultrasonic hatch cover testing, lifting appliance and gear surveys, pressure vessel inspection, hull ultrasonic thickness gauging, watertight integrity testing and diver-based underwater inspection of plating, sea chests, propellers and rudders. Senhai Marine holds service supplier approvals from multiple classification societies including ABS, BV, DNV, KR, Lloyd's Register and RINA for relevant categories, supporting acceptance of reports during periodical, intermediate and special surveys under SOLAS, MARPOL and code requirements. Located near major shipbuilding and ship repair clusters along the Yangtze, the firm coordinates attendances at Nantong, Shanghai and nearby terminals, deploying engineers and certified test equipment to suit tight commercial schedules. By combining LSA, FFE, tightness testing, thickness gauging and underwater inspection capability with broad class recognition, the Nantong team supports shipowners, managers and shipyards needing coordinated multi-discipline service work in eastern China.