1: Igwe ọkụ ọkụ (ASTM A335 P5, P9, P11, P22, P91, P92 wdg) Nkọwa ọkọlọtọ maka enweghị ntụpọ Ferritic Alloy-Steel Pipe maka ọrụ okpomọkụ dị elu 2: Line Pipe (API 5L Gr.B X40 X52 X52 Etc) Pipeline enweghị nkebi ejiri maka ụgbọ njem dị elu mmanụ, Steam na Wat ...
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