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Type 639 is a type of ocean surveillance ship is the newest oceanographic surveillance ship (as of mid 2014) developed by China for its People's Liberation Army Navy (PLAN). A single unit is currently in service and more units are planned to follow.

Type 639 is a SWATH design of 1500 tons of displacement with three anchors. In addition to the SWATH hull form, another unique feature of Type 639 oceanographic research ship is the adaptation of integrated electric propulsion system. Developed by China Shipbuilding Industry Corporation (CSIC), the subsystems are developed by various subsidiaries and divisions of CSIC. The ship is jointly developed by 701st (中国船舶重工集团公司第七零一研究所) and The 702nd Institute of CSIC (中国船舶重工集团公司第七零二研究所). The ship was built by Wuchang Shipbuilding Industry Co. Ltd (武昌船舶重工有限责任公司) of CASIC. The integrated electric propulsion system was the result of work of several CASIC subsidiaries and divisions, including Wuhan Machinery Plant Co. Ltd (武汉船用机械有限责任公司), Henan Diesel Engine Industry Co. Ltd (河南柴油机重工有限责任公司), Shanxi Fenxi Heavy Industry Co. Ltd. (山西汾西重工有限责任公司), Chongqing Huayu Electrical Instrumentation Plant (重庆华渝电气仪表总厂),Beijing Great Wall Electronic Equipment Co. Ltd. (北京长城电子装备有限责任公司), and the final integration of various subsystems of the integrated electric propulsion system is The 712th Institute of CSIC (中国船舶重工集团公司第七一二研究所). To meet the strict requirement, nearly a dozen new technologies were incorporated, most of them were for the first time in China. The most obvious visual feature of Type 639 oceangraphic surveillance ship is that there is a well in the center to lower acoustic or other secientific equipment.[1]

 Type   Pennant #   Builder   Launched   Commissioned   Status   Fleet 
639 Bei-Diao 991 Wuchang Shipyard After 2000 2009 Active East Sea Fleet


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