The Ductile iron pipes is confim to ISO2531, ISO4179, ISO8179, ISO4633, ISO7186, EN545, EN598, BS4772 Standard. Ductile Iron Flange pipe is mainly used ... we can supply weld flange pipes ,the Lenth is 2-5.8 meters.1, Standards: ISO2531, ISO4422, EN545, EN598, BS4772, AWWA C110. 2 ...