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          CN

          Classification

          Data Download

          Energy Department

          NB/T 47020-2012,NB/T 47023-2012
          • Long

            Long Neck Butt Welding Flange

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          • Blind

            Blind Flange

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          • Non-standard

            Non-standard Blind Flange

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          • Long

            Long Neck Butt Welding Flange

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          • Non-standard

            Non-standard Blind Flange

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          • Large

            Large Caliber Flange

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