Zhoushan Dongwan Fire-Fighting Equipment Service Co., Ltd. operates from Zhoushan, an island-based Zhejiang Province city that forms the eastern half of the combined Ningbo-Zhoushan port complex, the world's busiest port by cargo throughput, with major crude, bulk and ship-repair facilities at Cezi, Liuheng, Daxie and the surrounding islands of the archipelago. The firm concentrates on fire-safety and lifesaving equipment service work performed onboard commercial tonnage calling Zhoushan-area berths and the surrounding anchorages used for crew change, bunkering and routine maintenance. Fire-safety services include portable extinguisher recharge, fire main and hydrant pressure testing, breathing apparatus maintenance on EEBD and SCBA sets used in enclosed-space drills, and overhaul and recharge of fixed CO2, foam and water-spray installations. Lifesaving work covers lifeboat and rescue boat annual and five-yearly servicing, liferaft annual inflation and pressure testing, immersion-suit and lifejacket renewal and overhaul of associated release gear and on-load hooks together with hoist wires, falls and survival pack contents. Additional disciplines cover pressure vessel inspection on engine-room and auxiliary vessels including air receivers and hot-water installations, ultrasonic hatch-cover testing on weather-deck closures and watertight integrity checks on bulkheads and door arrangements where SOLAS tightness requirements apply. Dongwan holds service supplier recognition by Bureau Veritas, the China Classification Society, the Korean Register and Lloyd's Register, allowing servicing records to be considered during periodical, intermediate and special surveys carried out under SOLAS and class rules on commercial tonnage trading through the East China Sea. Customers include shipowners, ship managers and port agents arranging routine maintenance attendance during commercial port calls in the Ningbo-Zhoushan area.