ERW bututu misali ne kamar haka: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Standard nufin gas da ruwa a cikin man fetur da kuma iskar gas masana'antu domin tunani, wanda aka yi amfani da su. sumul karfe bututu da welded karfe bututu, ciki har da na kowa tashar jiragen ruwa da tashar jiragen ruwa, bututu soket tashar jiragen ruwa ...
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