ERW paipa tulaga e pei ona taua i lalo: API 5L, ASTM A53 B, ASTM A178, ASTM A500/501, ASTM A691, ASTM A252, ASTM A672 API 5L Standard faʻamoemoe i le kesi ma le vai i le suauʻu ma kesi alamanuia mo faʻamatalaga, lea e faʻaaogaina mo paipa uamea seamless ma paipa uʻamea uʻamea, e aofia ai uafu masani ma uafu, uafu tumu paipa...
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