PE is a polyethylene plastic, the most basic kind of plastic.High-density polyethylene (HDPE) or polyethylene high-density (PEHD) is a high crystallinity, non-polar thermoplastic resin polyethylene thermoplastic.HDPE is resistant to many different solvents and has a wide variety of applications.
Butt fusion welding is the name given to hot plate welding of thermoplastic pipes. The heating phase, sometimes referred to as 'bead up', is where the pipe ends are pressed against a heated plate for a period of time. This is followed by the 'heat soak' phase where the pressure is reduced to just hold the pipe ends on the hot plate. This allows time for the heat to soak into the material at the pipe ends.After the heat soak phase, the hot plate is removed and the pipe ends brought together. The time taken to do this is called 'dwell time' and needs to be as short as possible. The final phase is the welding/cooling time, predetermined subject to pipe diameter and wall thickness.
PE pipes can be divided into medium density polyethylene pipes and high density polyethylene pipes. According to the wall thickness, it is divided into SDR11 and SDR17.6 series. The former is suitable for conveying gaseous gas, natural gas, and liquefied petroleum gas, and the latter is mainly used for conveying natural gas. Compared with steel pipes, the construction process is simple and has certain flexibility. More importantly, it is not necessary to do anti-corrosion treatment, which will save a lot of processes.The disadvantage is that in the construction, special attention should be paid to the safe spacing of the heating, and it should not be exposed to the sunlight in the air.PE pipe is sensitive to chemicals, it should prevent the leakage of the sewage pipe.