Even in heavy–land areas, where only the strongest –galvanized iron, cement and asbestos survive; plastic, in the form of High Density Polyethylene (HDPE) has scored beyond doubt. It is very much essential to define strength of the material at a given reference life time. HDPE has a projected life time of 50 years transporting water at 30 deg. C. However, with safety factors in consideration actual life time is much beyond 50

Even in heavy–land areas, where only the strongest –galvanized iron, cement and asbestos survive; plastic, in the form of High Density Polyethylene (HDPE) has scored beyond doubt. It is very much essential to define strength of the material at a given reference life time. HDPE has a projected life time of 50 years transporting water at 30 deg. C. However, with safety factors in consideration actual life time is much beyond 50