Nippon Kaiji Kyōkai

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The Nippon Kaiji Kyōkai ( Japanese. 財 団 法人 日本 海事 協会 , Zaidan Hōjin Nippon Kaiji Kyōkai , dt. "Legal Foundation Japanese Marine Society", abbreviated: ClassNK or NK) based in Chiyoda , Tokyo is a global classification society .

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The company goes back to the Teikoku Kaiji Kyōkai founded in November 1899 (about: "Imperial Marine Society ", TKK for short), which was concerned with issues of the development and regulation of shipbuilding and shipping in Japan. In the first years of its existence, the company first prepared the basics of ship classification, and finally in 1920 to classify the first ship, the Kwanan Maru . Six years later, the TKK was registered with the Institute of London Underwriters with the NS * notation . In the period between the wars, the TKK cooperated with the British Corporation Register of Shipping and other international registers, and in 1929 it achieved a classified volume of one million gross register tons for the first time. In 1997 100 million gross tonnage were recorded and in 2008 about 7000 ships with 160 million tons were reported.

After the end of World War II, the class traded as Nippon Kaiji Kyōkai from 1946. Years of strong growth followed, following branches in London and New York, opening the 70 inspection offices in 1962, and in 1966 reaching ten million gross tons. In 1968 the Japanese classification society was one of the founding members of the International Association of Classification Societies (IACS).

Today, ClassNK's work extends far beyond the mere inspection and classification of ships and offshore structures and includes related areas such as technical and organizational quality monitoring, research, training, damage surveys and others.

Ships that have been measured by Nippon Kaiji Kyōkai bear the letters NK on the loading lines (Plimsoll mark) amidships.

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