HDPE Double-Wall Corrugated Drainage Pipe by Lianshu Plastic from Xinjiang

The PE pipe for water supply is a replacement product for traditional steel pipes and polyvinyl chloride drinking water pipes. Water supply pipes must withstand certain pressures, and typically, high molecular weight PE resins with good mechanical properties, such as HDPE resin, are chosen. LDPE resin has low tensile strength, poor pressure resistance, low rigidity, poor dimensional stability during processing, and difficult connections, making it unsuitable as a material for pressure water supply pipes. However, due to its high sanitary standards, LDPE, especially LLDPE resin, has become a common material for producing drinking water pipes. The melting viscosity of LDPE and LLDPE resins is low, with good flowability and ease of processing, allowing for a wide range of melt flow index (MI) selection, usually between 0.3-3g/10min. A good pipeline should not only have good economic performance but also possess a series of advantages, including stable and reliable connections, impact resistance, crack resistance, aging resistance, and corrosion resistance. Compared to traditional pipe materials, HDPE piping systems have the following advantages: 1. Reliable connections: The polyethylene piping system connects using electric heat fusion, with the joint strength exceeding the strength of the pipe itself. 2. Good low-temperature impact resistance: Polyethylene's low-temperature embrittlement temperature is very low, allowing safe use within the -60 to 60℃ temperature range. During winter construction, the material's good impact resistance prevents pipe brittleness. 3. Good resistance to stress cracking: HDPE has low notch sensitivity, high shear strength, and excellent scratch resistance, with outstanding resistance to environmental stress cracking. 4. Good chemical corrosion resistance: HDPE pipes can withstand corrosion from various chemical media; chemical substances in the soil do not degrade the pipes. Polyethylene is an electrical insulator, so it will not rot, rust, or undergo electrochemical corrosion; additionally, it does not promote the growth of algae, bacteria, or fungi. 5. Despite this, harmful substances are released when burned. 6. Aging resistance and long service life: Polyethylene pipes containing 2-2.5% uniformly distributed carbon black can be stored or used outdoors for 50 years without damage from ultraviolet radiation. 7. Good wear resistance: Tests comparing the wear resistance of HDPE pipes to steel pipes show that HDPE's wear resistance is four times that of steel pipes. In the field of slurry transport, HDPE pipes provide better wear resistance compared to steel pipes, indicating a longer service life and better economic performance. 8. Good flexibility: The flexibility of HDPE pipes makes them easy to bend, allowing for alterations in the pipeline direction to avoid obstacles, which can reduce the amount of fittings used and lower installation costs in many cases. 9. Low water flow resistance: HDPE pipes have a smooth inner surface with a Manning coefficient of 0.009. The smoothness and non-adhesive properties ensure that HDPE pipes have a higher transport capacity than traditional pipe materials, while also reducing pressure loss and water transport energy consumption. 10. Easy handling: HDPE pipes are lighter than concrete pipes, galvanized pipes, and steel pipes, making them easier to transport and install. The lower manpower and equipment requirements significantly reduce installation costs. Multiple new construction methods: HDPE pipes have various construction techniques. In addition to traditional excavation methods, several new trenchless technologies, such as pipe jacking, directional drilling, lining, and pipe bursting, can be employed. This is an excellent choice for locations where excavation is not permitted, thus expanding the application fields of HDPE pipes. Flexibility: Due to the softness of PE-RT, special tools are not needed during construction, resulting in relatively low construction costs. 2. Thermal conductivity: Pipes used for floor heating require good thermal conductivity. PE-RT has good thermal conductivity, with a thermal conductivity coefficient twice that of PP-R and PP-B pipes, making it ideal for floor heating applications. 3. High-temperature resistance: PE-RT can withstand high temperatures of up to 90℃, while PEX can only reach 65℃. 4. Low-temperature impact resistance: PE-RT has good low-temperature impact performance. During winter construction, the pipes are less likely to crack due to impact, increasing the flexibility of construction arrangements. 5. Environmental friendliness: PE-RT and PP-R can be recycled and do not pollute the environment, whereas PEX cannot be recycled and may cause secondary pollution. 6. Stable processing performance: PEX has issues with controlling cross-linking degree and uniformity, making processing complex and directly affecting pipe performance. In contrast, PE-RT and PP-R are easy to process, with pipe performance mainly determined by the raw materials, allowing for relatively stable performance. PE-RT stands for Polyethylene Raised Temperature, which is a medium-density ethylene-octene copolymer designed specifically for heating systems, with a narrow molecular weight distribution and uniform octene distribution in the polymer backbone. It retains the original sanitary and processing advantages of PE while enhancing high-temperature durability as a new type of pipe material. Pipes produced from this material are primarily used in hot water/heating systems within buildings, with durability matching that of the building, lasting up to 50 years, and also exhibiting excellent recyclability, providing high added value.