ERW pombi chiyero ndeiyi inotevera: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Standard ine chinangwa chegasi nemvura muindasitiri yemafuta negesi yereferensi, iyo inoshandiswa musono simbi pombi uye welded simbi pombi, kusanganisira zvakajairika chiteshi uye chiteshi, pombi socket port...
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