... T270-2007 ISO9001:2008 &ISO1400 Steel Reinforced Spirally Wound HDPE Drainage PipeFeatures and Benefits1. Distinguished comprehensive performances2. Safe and reliable ... long as 50 yearsApplication Areas1. Public works: used as drainage pipe and blow-off pipe while buried under the ground ... 4.Construction works: used as rain pipe of buildings, underground drainage pipe, blow-off pipe, vent pipe, etc.5. ...