Long term production of HDPE Double wall corrugated pipe, large diameter sewage drainage pipe and buried pipe

Double wall corrugated pipe PE large-diameter drainage pipe HDPE large-diameter corrugated pipe, HDPE corrugated pipe and large-diameter double wall corrugated pipe for municipal engineering are a new type of sewage engineering pipe developed in the early 1990s
With its unique design concept and hollow structure, the stress on the pipe wall is very uniform
Compared with other pipes, it mainly has the following characteristics:
1
Low project cost
  Save 30-50% compared with steel pipe; Compared with cement, the comprehensive cost is basically the same; Compared with FRP lime sand pipe, it only needs 1 / 5 of the engineering cost; Compared with the same type of HDPE hollow winding pipe, it can also save 25-50%, and the engineering maintenance cost is very low, which is 1 / 5 of the cost of other pipes

2
Strong compressive capacity
  Scientific organizational structure and high ring stiffness of the pipe make the pipe have better resistance to soil load
This performance is the advantage of double wall bellows compared with other structural walls

3
High density, light weight and convenient construction
  HDPE is the English abbreviation of high density polyethylene, with molecular weight of 70000-150000, density of 0
941-0
965, light weight, 1 / 8 of steel pipe and 1 / 10 of cement pipe, which can greatly reduce the transportation cost and hoisting cost during installation
The construction is fast, and socket type, Haff type and pipe fitting connection can be selected

4
Chemical corrosion resistance
  Polyethylene is an inert material, which can resist the corrosion of various chemical media such as acid, alkali and salt without electrochemical corrosion
It itself is an anti-corrosion material
So far, no reagent can dissolve polyethylene
General soil, acid, alkali, electric power and other factors will not damage the pipeline

5
Proper flexibility, good dynamic fracture toughness Kd value and good seismic resistance
  Due to the characteristics of HDPE material, when subjected to external force, the pipe can have certain deflection deformation without rupture, and has strong resistance to rapid transmission
PE bellows has good resistance to ground settlement (especially earthquake) caused by underground movement, and is suitable for grooves with complex terrain
In Baoshan District, Yunnan Province, China, an earthquake of magnitude 5
9 occurred in April 2001
Two PE pipes were unharmed, and the rest of the underground pipes were scrapped
Therefore, PE material is the pipeline material with good seismic performance at present

6
Excellent reading ability
  The molecular structure of PE material is CH2, which is safe even if it is decomposed
PE material belongs to food hygiene grade and is used in low-pressure water supply system without secondary pollution

7
The inner wall is smooth, the water resistance is small, and there is no scaling
  The inner wall of HDPE large-diameter corrugated pipe, HDPE corrugated pipe and large-diameter double wall corrugated pipe is very smooth, and the inner wall roughness K value does not exceed 0
01mm, while the steel pipe ductile iron pipe k = 0
06mm
After 10 years of operation, the K value of metal pipe will increase to 5-10 times, while the molecular surface of PE material does not carry positive and negative charges, and the charged impurities in water will not adhere to the pipe wall to form scale
Therefore, the flow is also large
The PE pipe has the same diameter as the metal pipe
Under the same pressure, the flow of PE pipe should be 1 / 4 larger

8
Excellent low temperature resistance
  The normal working temperature of HDPE large-diameter corrugated pipe, HDPE corrugated pipe and large-diameter double wall corrugated pipe is between - 40 ℃ and 60 ℃, and the working temperature range is very wide
It can also be constructed normally in the severe cold of minus 30 ℃
PE pipes are freeze-resistant pipes

9
Excellent impact resistance
  Among all the plastic pipes in the current market (PVC, PP, ABS, Pb), PE has excellent impact strength
Through the test, the impact strength of PE is 6 times that of PVC and 4 times that of PP

10
It has good electrical insulation performance