Different requirements for different processing types of PE pipes
Pe Pipe is made by the polymerization of monomer ethylene, due to the different conditions of polymerization reaction such as pressure and temperature during polymerization, different densities of resin can be obtained, and thus there are high-density polyethylene, medium-density polyethylene and low-density polyethylene. In the processing of different types of PE pipe, according to the different conditions of its application, the selection of different resin grades, while the requirements of the extruder and mold are also different.
(1) Reliable connection: the polyethylene piping system is connected by electro-thermal fusion, and the strength of the joints is higher than the strength of the piping body.
(2) Good low-temperature impact resistance: the low-temperature embrittlement temperature of polyethylene is extremely low, and it can be used in the temperature range of -60-60℃. During winter construction, no pipe brittleness will occur because of the good impact resistance of the material.
(3) Good resistance to stress cracking: HDPE has low notchability, high shear strength and excellent scratch resistance, and outstanding resistance to environmental stress cracking.
(4) Good chemical resistance: Hdpe Pipes are resistant to corrosion by a variety of chemical media, and the chemicals present in the soil will not cause degradation of the pipes. Polyethylene is an insulator of electricity, so it will not rot, rust or electrochemical corrosion; in addition it will not promote the growth of algae.
(5) Ageing resistance and long service time: polyethylene pipes containing 2-2.5% of uniformly distributed carbon black are able to be stored or used outdoors in the open air for 50 years without being damaged by ultraviolet radiation.
(6) Good abrasion resistance: the comparative test of the abrasion resistance of HDPE pipe and steel pipe shows that the abrasion resistance of HDPE pipe is 4 times of that of steel pipe. In the field of slurry transportation, compared with steel pipe, HDPE pipe has better abrasion resistance, which means thaT Hdpe pipe has longer service time and better economy.
(7) good flexibility: the flexibility of HDPE pipe makes it easy to bend, engineering can be changed by changing the direction of the pipe to bypass obstacles, in many occasions, the flexibility of the pipe can reduce the amount of piPe Fittings and reduce the cost of installation.
(8) low resistance to water flow: HDPE pipeline has a smooth inner surface, its Manning's coefficient is 0.009. smooth performance and non-adhesion characteristics to ensure that the HDPE pipeline has a higher conveying capacity than the traditional pipe, but also reduces the pressure loss of the pipeline and the energy consumption of water transmission.
(9) Convenient handling: HDPE pipe is lighter than concrete pipe, galvanized pipe and steel pipe, it is easy to handle and install, lower manpower and equipment needs, means that the installation cost of the project is greatly reduced.
(10) A variety of new construction methods: HDPE pipeline has a variety of construction techniques, in addition to the traditional excavation methods can be used for construction, but also a variety of new non-excavation techniques such as pipe jacking, directional drilling, pipe lining, cracking and other ways of construction, which is a good choice for some places that do not allow excavation, so HDPE pipeline has a wider range of applications.
