PE piping for water supply is a replacement product for steel pipes and polyvinyl chloride drinking water pipes.
PE pipes can withstand certain pressures, typically requiring the use of PE resins with high molecular weights and good mechanical properties, such as HDPE resins. LDPE resins have poor rigidity, poor dimensional stability during molding and processing, and are difficult to connect, making them unsuitable for pressure water pipes. LDPE, particularly LLDPE resins, have become common materials for producing drinking water pipes. LDPE and LLDPE resins have low melt viscosity and good fluidity, making them easy to process, thus offering a wider range of melt index options, usually between 0.3-3g/10min.
Compared to traditional piping materials, HDPE pipe systems feature a series of characteristics:
1. The polyethylene pipe systems are connected using electric heat fusion.
2. Polyethylene has a low cold脆bending temperature, suitable for use within a temperature range of -60 to 60°C. During winter construction, it is less prone to pipe fracturing.
3. HDPE pipes are resistant to corrosion from a variety of chemicals, and the chemicals present in the soil do not cause degradation to the pipes. Therefore, they are not prone to rotting, rusting, or electrochemical corrosion; in addition, they also do not promote the growth of algae, bacteria, or fungi.
4. Excellent Flexibility: The flexibility of HDPE pipes allows for easy bending, enabling the routing to navigate around obstacles in engineering. In many cases, this flexibility can reduce the need for fittings and lower installation costs.
5. Low hydraulic resistance: HDPE pipes feature a smooth inner surface with a Manning coefficient of 0.009. The smooth surface and non-adhesive characteristics ensure HDPE pipes have higher conveying capacity than traditional materials, while also reducing pressure loss in pipelines and water transportation energy consumption.
6. Easy to Handle: HDPE pipes are lighter than concrete pipes, galvanized pipes, and steel pipes, making them easy to transport and install. This reduces the need for excessive manpower and equipment, leading to lower installation costs for projects.
7. Various Construction Methods: HDPE pipes offer a range of construction techniques, including conventional excavation, as well as trenchless methods like jacking, directional drilling, pipe lining, and pipe bursting. These options are ideal for locations where excavation is not permitted.
