... ,DN100,DN150,DN200,DN250,DN300,DN350,DN400,DN450,DN500.DN600.DN700.DN800.DN900.DN1000.DN1200. 5.. standard :GB/T13295 BSEN545 EN598 ... =1800 L=2000 A. Ductile iron pipes standard: ISO2531-1998,BSEN545-2006 B. Effective length: 6M C. Pipe ends: Spigot and socket ...