Muyezo wa chitoliro cha ERW ndi motere: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Standard ikufuna kutulutsa mpweya ndi madzi mumakampani amafuta ndi gasi, omwe amagwiritsidwa ntchito opanda zitsulo chitoliro ndi welded zitsulo chitoliro, kuphatikizapo doko wamba ndi doko, chitoliro zitsulo doko ...
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