DI pipes used in potable water supply , drainage water deliveryde ranged DN80--DN12000 according to ISO2531-EN545 Shandong Ductile Iron Pipes Co., ... which produce water--cooled centrifugal casting ductile cast iron pipes according to ISO2531 and EN545 in China since 1989, ... severice such as guidance for pipeline design , pipeline laying, purchase pipes fitting , PE sleeving, valves and etc. c40 , c30, ...