Tianjin Hairun Marine Technical Co., Ltd., established in 2002 and based in Tianjin, is a marine technical services firm supporting commercial vessels calling at the Tianjin port complex and across the wider Bohai Bay region of northern China. The company has a registered capital of 50.9 million RMB and holds ISO 9001:2015 quality management and OHSAS 18001:2007 occupational health and safety certifications. Activities span life-saving appliances, fire-fighting equipment, radio and navigation electronics, structural inspection and underwater survey work. Engineers 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 used by crew. Radio and navigation work covers VDR and S-VDR annual performance tests, GMDSS annual surveys, GMDSS equipment maintenance, AIS annual inspections and EPIRB and SART testing. Hull and equipment scopes include ultrasonic hatch cover testing, lifting appliance and gear surveys, pressure vessel inspection, watertight integrity testing, diver-based underwater inspection and NDT activities. Tianjin Hairun holds service supplier approvals from a broad set of classification societies including ABS, BV, CCS, DNV, IRClass, KR, Lloyd's Register and RINA for relevant categories. The combination of broad scope, ISO-certified management systems and multi-society class recognition supports coordinated multi-discipline attendances for shipowners, managers and shipyards working through northern Chinese ports and the broader Bohai region.