Type 646 Kan Yang Class sea sweeping ship
The 646 type of sea-sweeping survey ship with NATO reporting name Kanyang (meaning Surveying Oceans) is not to be confused with Type 646 water tanker. The Type 646 Kanyang was developed in the 1970s under the naval development plan which required the sea survey work to extend to 200 nautical miles along the coast. It was necessary to have a new type of survey ship with good stability and airworthiness, free speed, endurance and self-sustaining power. Haisi Aviation Department proposed the task of developing 646 sea-measuring ship, designed by 4th Directorate of 708 Institute of China State Shipbuilding Corporation (CSSC), which is also nowadays more commonly known as China Shipbuilding and Oceanic Engineering Design Academy , and Guijiang Shipyard (449 Factory) undertook trial production.
In December 1978, two ships were started at the same time. On July 25, 1982, the first sea-sweeping survey ship, K426 (now named: Nanxun 426), was launched. The second sea-sweeping survey vessel, K428 (now known as Nanometer 428), was also launched on December 26, 1982. The two sea-sweeping survey vessels were both serving in the South China Sea Fleet Survey Team.
The ship sailed on the coast of China and served as a sea-sweeping survey. It was the first work ship in China equipped with special sea-sweeping equipment and various measuring instruments. Because of its good stability, large drag, complete equipment and reasonable layout, it greatly improves the sea-sweeping operation rate, improves the quality of sea-sweeping and reduces the labor intensity, and is highly praised by the shipbuilding department.
These ships are named as Nan-Ce (meaning South Survey), followed by a three digit number. South means South Sea Fleet and Survey means that these ships are survey vessels.
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