In recent years throughout the world, the world, the importance of plastics pipes in the design related with piping systems for public and industrial water supply coupled with sewage transport has gradually increased. This trend reflects a growing confidence in plastics as PP-R pipe system, perhaps due mainly to greater worldwide knowledge and also experience in this field.The plastics are mostly manufactured on a petrochemical basis with petroleum as the raw material. In this context it might be of interest to know how the world consumption of petroleum looks. Only 4% of the world production connected with oil used for manufacturing plastics while 96% is burned as fuel in the fields about transportation, heating, etc.The use related with plastics is expanding rapidly, coupled with especially in the case concerning plastics pipes. This is particularly true for pipes designed for water pipes together with sewers outdoors indoors.

All industrial countries show the same tendency. For example, it can be mentioned that high quality hdpe pipe production in Europe rose from about 1.4 million tonnes in 1985 to 2.6 million tonnes in 1997. The corresponding figures for USA were 1.8 million tonnes in 1986 coupled with 2.4 million tones in1997. Plastics pipe market EuropeThe Further annual growth in Europe for pipes is estimated at 7% for PE, 10% for PP and then 2% for PVC.The favorable price trend has also contributed to the fact that today plastics pipes are competitive with conventional pipes within the total civil engineering infrastructure branch.Against the background related with such developments, it appears suitable to spread further information about plastics pipes together with hoe they really should be used in a proper way for water supply coupled with sewage disposal.

As a result, the previous survey concerning the problems, especially in the world of outdoor pipe applications , is hereby updated.Cross linked polyethylene can be based upon PE hdpe pipe as well as (M D P E). In the cross linking process the molecules are linked together by robust chemical bonds and then chemical and then physical cross linking approaches are both available. The chemical approaches implies use for cross linking agents such as peroxide, (A Z O) compounds, while physical cross linking is archived by electron radiation.