Zhoushan Hong-Union Marine Engineering Co., Ltd is based in 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, container and ship-repair facilities at Cezi, Liuheng, Daxie and the surrounding islands of the archipelago. The firm concentrates on fire-fighting equipment service work performed onboard commercial vessels calling Zhoushan-area berths and the surrounding anchorages used for crew change, bunkering, stores and routine maintenance attendance during ordinary port calls. The fire-safety practice covers periodical testing of portable fire extinguishers and recharge of dry-powder, foam and CO2 cylinders, pressure testing of fire main lines and individual hydrants on weather decks and inside accommodation, hose maintenance and renewal, and inspection and maintenance of breathing apparatus including EEBD and SCBA sets used during enclosed-space drills and emergency-response training. Additional scopes include inspection of associated fittings, isolating valves and storage arrangements, with replacement of expired components and renewal of associated documentation as required by SOLAS chapter II-2 and class rules. Field service teams attend at berth and anchorage with calibrated test gauges, recharge facilities and spare parts for routine renewals, and reports are prepared in formats accepted by attending classification surveyors. Hong-Union holds service supplier recognition by the Korean Register, allowing fire-safety records to be considered during periodical, intermediate and special surveys on tonnage trading through the East China Sea, with customers drawn from shipowners, technical managers and port agents arranging short-stay maintenance attendances during commercial calls.