In April 1997, NKK carried out a corrosion inspection project in the Alyeska Pipeline in Alaska U.S.A. and successfully inspected all of the 1280 km long pipeline. Ultrasonic In-Line Inspection Pig, NKK developed originally, was applied for theproject. The project allowed NKK to have a unique experience. The longest distance of a single inspection run was 1055 km. This is the world record in distance for a single inspection run for a corrosion survey.
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