February 14, 2022
High-density polyethylene, referred to as "HDPE".
HDPE is a highly crystalline, non-polar thermoplastic resin.
HDPE has excellent resistance to most household and industrial chemicals. HDPE has good electrical properties and high insulating dielectric strength, making it very suitable for wires and cables; it does not absorb moisture and has good waterproof and vapor properties, making it an excellent water pipe material; it has excellent impact resistance and temperature resistance range. Wide range of engineering water supply projects suitable for various environments.
HDPE is a kind of good pipeline, it should not only have good economy, but also have a series of advantages such as stable and reliable interface, material impact resistance, crack resistance, aging resistance, corrosion resistance, etc. Compared with traditional pipes, HDPE pipeline system has The following series of advantages:
(1) Reliable connection: The polyethylene pipe system is connected by electrothermal fusion, and the strength of the joint is higher than that of the pipe body.
(2) Good low temperature impact resistance: The low temperature embrittlement temperature of polyethylene is extremely low, and it can be used safely in the temperature range of -60-60 °C. During construction in winter, due to the good impact resistance of the material, the pipe will not be brittle.
(3) Good resistance to stress cracking: HDPE has low notch sensitivity, high shear strength and excellent scratch resistance, and its resistance to environmental stress cracking is also very outstanding.
⑷Good chemical corrosion resistance: HDPE pipes are resistant to corrosion by a variety of chemical media, and chemical substances in the soil will not cause any degradation to the pipes. Polyethylene is an electrical insulator, so it does not rot, rust or electrochemically corrode; it also does not promote algal, bacterial or fungal growth.
⑸Aging resistance, long service life: polyethylene pipes containing 2-2.5% evenly distributed carbon black can be stored or used outdoors for 50 years without being damaged by ultraviolet radiation.
⑹ Good wear resistance: The comparison test of wear resistance of HDPE pipe and steel pipe shows that the wear resistance of HDPE pipe is 4 times that of steel pipe. In the field of mud transportation, compared with steel pipes, HDPE pipes have better wear resistance, which means that HDPE pipes have longer service life and better economy.
⑺Good flexibility: The flexibility of HDPE pipes makes it easy to bend, and in engineering, obstacles can be bypassed by changing the direction of the pipes. In many occasions, the flexibility of pipes can reduce the amount of pipe fittings and installation costs.
⑻ Small water flow resistance: HDPE pipe has a smooth inner surface, and its Manning coefficient is 0.009. The smooth performance and non-adhesive properties ensure that the HDPE pipe has a higher conveying capacity than traditional pipes, and also reduces the pressure loss of the pipeline and the energy consumption of water conveying.
⑼ Easy to handle: HDPE pipes are lighter than concrete pipes, galvanized pipes and steel pipes. They are easy to handle and install, and lower manpower and equipment requirements mean that the installation cost of the project is greatly reduced.
⑽Various new construction methods: HDPE pipes have various construction techniques. In addition to traditional excavation methods, various new trenchless techniques such as pipe jacking, directional drilling, lining, It is a good choice for some places where excavation is not allowed.
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