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Testing of welded pipes
The Nord Stream Pipeline will be made up of high-quality steel pipes with walls ranging in thickness from 41 mm to 27 mm as the pressure drops along the route. Pipes are coated internally with anti-friction coating and externally with an anti-corrosive and weight coating. From inland storage, the pipes will be taken by pipe carrier to a large pipe-laying vessel, where they will be inspected for possible transport damage.
In a "double-joint welding station", two 12 m pipes will be welded together to a 24 m "double joint", with a welding pass from both inside and outside. Upon completion, the joint will be inspected by ultrasonic testing to identify possible welding defects. Good welds will be covered with an anti-corrosion coating and the double joint lowered to the seabed in a continuous line by pulling the pipe-laying vessel 24 m forward while the pipeline sections are kept under tension over the stinger.
Категории
Логистика/Производство труб › Производство труб
Источник
Nord Stream AG
Дата
8 декабря 2005 г.
Загрузки
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Photo may be used to accompany news-related reports about Nord Stream provided the source (Nord Stream AG) is mentioned.
