... ISO 4429 and BS6920Certification: ISO9001, ISO14001, OHSAS18001Applications: water supply, industrial liquids transportation and sewage treatmentHDPE Pipe Application:1.Urban ... non-toxic, not fouling, more suitable for urban water supply main conduit and buried tube, safety, hygiene, convenient ... pipe and steel tube Used for old nets renovation project, don't need large area excavation, low cost, ...