... Wound HDPE Drainage Pipe DN200-DN2600, SN8 SN10 SN12.5 Standard: CJ/T270-2007 ISO9001:2008 &ISO1400 Steel Reinforced ... underground drainage pipe, blow-off pipe, vent pipe, etc.5. Dirty water collecting pipe in refuse landfills.6.Large-scale ... NominalDN/ID,mmInternal DiameterDN/ID,mmRing Stiffness RankSN8SN10SN12.5≥8KN/m2≥10KN/m2≥12.5KN/m2External Diameterde,mmExternal Diameterde,mmExternal Diameterde, ...