Precautions for PE pipeline layout and installation

PE pipe is a highly crystalline and non-polar thermoplastic resin. The original appearance of HDPE is milky white, with a certain degree of semi transparency in the thin section. PE has excellent resistance to most household and industrial chemicals. Certain types of chemicals can cause chemical corrosion, such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene), and halogenated hydrocarbons (carbon tetrachloride).

Aggregation process in PE pipes:

In principle, the high-density polyethylene pipe specific resin with a pressure rating of MRS8 (PE80) can be polymerized through one of multiple low-pressure polymerization processes. The specialized resin for MRS10 (PE100) pipes is usually produced using series, bimodal, or multimodal polymerization processes.

The bimodal or multimodal polymerization process can customize polymers to meet the needs of different fields and customers. For new specialized materials for pipes, rigidity, toughness, processability, and long-term performance are all very important. The commonality of all PE100 polymerization processes is the inclusion of at least 2 series connected polymerization reactors.

Characteristics of PE pipes:

⑴ Reliable connection: The polyethylene pipeline system is connected by electric melting method, and the strength of the joint is higher than that of the pipeline body.

⑵ Good low-temperature impact resistance: Polyethylene has an extremely low low-temperature brittleness temperature and can be safely used in the temperature range of -60-60 ℃. During winter construction, due to the good impact resistance of the materials, there will be no occurrence of pipe brittleness.

⑶ Good stress cracking resistance: HDPE has low notch sensitivity, high shear strength, excellent scratch resistance, and outstanding resistance to environmental stress cracking.

⑷ Good chemical corrosion resistance: HDPE pipes can withstand corrosion from various chemical media, and the chemicals present in the soil will not have any degradation effect on the pipes. Polyethylene is an electrical insulator and therefore does not exhibit signs of decay, rust, or electrochemical corrosion; In addition, it does not promote the growth of algae, bacteria, or fungi.

⑸ Aging resistance and long service life: Polyethylene pipes rich in 2-2.5% uniformly distributed carbon black can be stored or used outdoors for 50 years without being harmed by ultraviolet radiation.

⑹ Good wear resistance: The wear resistance of HDPE pipes and steel pipes is compared with experiments, and the wear resistance of HDPE pipes is four times that of steel pipes. In the field of mud transportation, compared with steel pipes, HDPE pipes have very good wear resistance, which means that HDPE pipes have a longer service life and very good economy.

⑺ Good flexibility: The flexibility of HDPE pipes makes them simple and winding. In engineering, obstacles can be bypassed by changing the direction of the pipeline. In many cases, the flexibility of the pipeline can reduce the amount of pipe fittings and lower installation costs.

⑻ Convenient transfer: HDPE pipes are lighter than concrete pipes, galvanized pipes, and steel pipes. They are easy to transfer and install, requiring less manpower and equipment, which means that the installation cost of the project is greatly reduced.

Multiple new construction methods: HDPE pipes have multiple construction skills. In addition to traditional excavation methods, various new non excavation techniques such as pipe jacking, directional drilling, lining, and cracking can also be used for construction. This is the only option for places that do not allow excavation, making HDPE pipes more widely used.

Attention should be paid to the layout of PE pipes and pipelines

1. PE pipes buried underground should not pass through the foundations of buildings and structures. When it is necessary to pass through, protective sleeves should be used to protect the foundations;

2. When laying PE pipes below the low elevation of building or structural foundations, they must not be within the range of the diffusion angle under pressure. The diffusion angle is generally taken as 45 °;

3. PE pipes should be laid below the freezing line;

4. Residential communities, industrial parks, and industrial and mining enterprises, with a nominal outer diameter of less than or equal to 200mm for water distribution main pipes, can be arranged along the perimeter of the building, with a clear distance from the exterior wall not less than 1.00m;

5. PE pipelines are strictly prohibited from crossing through rainwater and sewage inspection wells and drainage channels;

6. The minimum depth of soil cover on the top of PE pipes should not be less than 0.60m under sidewalks and 1.00m under light vehicle lanes.