Lots of people typically puzzle t regarding the plastic coated pipelines as well as 3PE anti-corrosive pipes because they are very similar to their appearance. Covered plastic pipe, additionally referred to as underground layered steel pipe or steel-plastic composite steel pipeline, is the steel pipeline which is thawed an organic layer with a density of 0.5 ~ 1.0 mm on the internal and outer wall surface such as modified polyethylene (PE), ethylene-acrylic copolymer (EAA), epoxy (EP) powder, safe polypropylene (PP) or non-toxic polyvinyl chloride (PVC). This underground layered steel pipeline incorporates the advantages of steel and plastics. It not just has the benefits of high toughness, easy connection, water impact resistance and so forth however likewise terminates the disadvantages such as simple deterioration, air pollution, scaling, low toughness of the plastic pipe and also inadequate fire-fighting performance of steel pipeline in water. It supplies a long life expectancy as well as more financially with layout life can get to half a century.