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| Type | BW(butt-welding); High pressure cap ; Threaded cap, Seamless cap; Welded cap |
| Standard | ANSI B16.9 / 16.28, API 5L, ASME B36.10M---1996, DIN2605/2615/2616, JIS P2311/2312 |
| Size | 1/2" ~ 48"( Seamless); 16" ~ 72"(Welded) |
| Wall Thickness | SGP ~ SCH XXS |
| Surface treatment | Transparent oil, rust-proof oil or hot galvanizing. |
