1.1 This European Standard specifies requirements for the products listed below used for the conveyance of aqueous liquids,including water for human consumption: - seamless and welded non-alloy steel tubes; - end preparation of tube ends for butt welding; - fittings fabricated from the tube; - fittings fabricated from plate or strip. NOTE This European Standard contains informative annexes giving guidance on tube sizes relevant to each manufacturing process covered,the relationship between nominal outside diameter (D)and nominal size (DN),on jointing other than butt welding,and on corrosion protection. 1.2 This European Standard covers a range of tube outside diameters from 26,9 mm to 2 743 mm.