HDPE pipe characteristics

Main Features HDPE is a high crystallinity, non-polar thermoplastic resin. The appearance of the original HDPE is milky white, and the thin section is partially translucent. PE has excellent resistance to most domestic and industrial chemicals. Certain classes of chemicals can cause chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance for packaging purposes. HDPE has good electrical properties, especially the high dielectric strength of the insulation, making it very suitable for wires and cables. Medium to high molecular weight grades are impact resistant at room temperature or even down to -40F. The properties of the various grades of HDPE are the proper combination of four fundamental variables: density, molecular weight, molecular weight distribution and additives. Different catalysts are used to produce polymers with tailored special properties. These variables combine to produce HDPE grades for different uses; achieving a balance in performance. Product performance High-density polyethylene is white, tasteless and odorless granules with a melting point of about 130°C and a relative density of 0.941-0.960. It has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. Dielectric properties, environmental stress cracking resistance is also good.

PE pipe characteristics: PE water supply pipe characteristics:

1. Long service life: Under normal conditions, the service life is at least 50 years.

2. Good sanitation: PE pipe does not contain heavy metal additives, does not scale, does not breed bacteria, and solves the problem of secondary pollution of drinking water. It complies with the GB/T17219 safety evaluation standard and the relevant sanitation safety evaluation regulations of the Ministry of Health.

3. Corrosion resistance of various chemical media: no electrochemical corrosion.

4. The inner wall is smooth, the coefficient of friction is extremely low, the passing capacity of the medium is correspondingly improved and it has excellent wear resistance.

5. Good flexibility, high impact strength, strong shock resistance and twist resistance.

6. Light in weight, easy to transport and install.

7. Electrofusion connection, hot-melt butt joint, and hot-melt socket connection technology make the interface stronger than the pipe body, ensuring the safety and reliability of the interface.

8. The welding process is simple, the construction is convenient, and the overall project cost is low.

9. PE environmental protection and healthy water supply pipes dn20~dn90 are blue, dn110 and above are blue or black with blue lines, other colors need to be customized, and the color of accessories corresponds to the color of the pipe.

10. 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 HDPE PIPES have a higher conveying capacity than traditional pipes, and also reduce the pressure loss of the pipeline and the energy consumption of water transportation.

Matters needing attention in the application of HDPE water supply pipes

1. For outdoor laying in the open air, where there is sunlight, it is recommended to take sheltering measures.

2. Buried HDPE water supply pipes, pipelines with DN≤110 can be laid in a slight serpentine shape in summer, and pipelines with DN≥110 can resist thermal stress due to sufficient soil resistance, so there is no need to reserve pipe length; in winter, no pipe length is required Reserve tube length.

3. When installing HDPE PIPES, if the operating space is too small (such as: pipe wells, construction inside the suspended ceiling, etc.), the electrofusion connection method should be used.

4. When hot-melt socket connection, the heating temperature should not be too high or too long, and the temperature should be controlled at 210±10°C, otherwise it will cause too much molten slurry extruded from the fittings, reducing the inner diameter of the water; when socketing the pipe fittings Or the joints of the pipes should be clean, otherwise the sockets will be disengaged and leak; at the same time, pay attention to controlling the angle and direction of the pipe fittings to avoid rework.

5. When the hot-melt butt joint is connected, the voltage is required to be between 200 and 220V. If the voltage is too high, the temperature of the heating plate will be too high, and the voltage is too low, and the docking machine will not work normally; when docking, keep the docking interface aligned, otherwise It will cause insufficient butt joint area, insufficient welding joint strength, and misaligned curling; the pipe joints are not cleaned when the heating plate is heated, or there are oil, sediment and other impurities on the heating