HDPE Double Wall Corrugated Pipe Specifications in Malaysia

Differences between HDPE double wall corrugated pipe and PE double wall corrugated pipe

1. The intensity is different. HDPE pipes must withstand a certain pressure, and PE resins with large molecular weight and good mechanical properties, such as HDPE resins, are usually selected. The strength is 9 times that of ordinary polyethylene pipe (PE pipe).

2. The wear resistance is different. Among all engineering plastics, HDPE has the highest wear resistance of plastics. The higher the molecular weight, the more wear-resistant the material is, even more than many metal materials (such as carbon steel, stainless steel, bronze, etc.), and ordinary PE is only one-tenth of HDPE.

3. The substitution effect is different. HDPE corrugated pipe is the replacement product of traditional steel pipe and PVC drinking water pipe. However, PE polyvinyl chloride can only be used as an external channel pipe, and even low-density PE pipes can only pass through water.

4. The scope of application is different. HDPE corrugated pipes are mainly used in: municipal engineering water supply systems, building indoor water supply systems, outdoor buried water supply systems and residential quarters, plant buried water supply systems, old pipeline repairs, water treatment engineering piping systems, gardens, irrigation and other industrial fields water pipes etc. Medium-density polyethylene pipes are only suitable for transporting gaseous artificial gas, natural gas, and liquefied petroleum gas. Low-density PE polyethylene pipe is a hose. You can leave us a message to get more hdpe double wall corrugated pipe specifications in Malaysia.

Application of HDPE corrugated pipe in urban water supply and drainage engineering

High-density polyethylene double-wall corrugated pipe (HDPE pipe) is a new type of lightweight pipe that is environmentally friendly, safe, and cost-effective. It is a new type of material with a ring-shaped corrugated outer wall and a smooth inner wall. With the further development of national infrastructure, high-density polyethylene (HDPE) double wall drainage pipe are widely used by municipal and water conservancy departments because of their many advantages and competitiveness. At present, in the water supply and drainage pipeline system, plastic pipes have gradually replaced traditional pipes such as cast iron pipes and galvanized steel pipes and become the mainstream pipes. With the development of the petrochemical industry and the continuous improvement of material manufacturing technology, the output of plastic pipes has increased rapidly, and the types of products have become more diversified. Moreover, the design theory and construction technology of plastic pipes in construction have also achieved great development and improvement, and accumulated rich practical experience, which has made plastic pipes occupy a very important position in building water supply and drainage pipeline projects. The inner wall of HDPE double wall corrugated pipe is smooth and flat, the outer wall is trapezoidal corrugated, and there is a hollow layer between the inner and outer walls. Corrosion, good wear resistance, convenient construction, low installation cost, long service life and so on. Widely used in municipal renovation projects, construction, industrial and agricultural drainage, agricultural water-saving irrigation, sewage treatment projects and other fields, it is the best substitute for traditional cement pipes, cast iron pipes and other pipe materials. However, HDPE pipe is a new type of pipe material in China. There is no national unified pipeline design specification and construction acceptance specification. Problems are prone to occur in the process of pipeline burial, connection and connection with inspection wells. According to the characteristics of HDPE double wall drainage pipe, the author analyzes the pipeline construction method and proposes a solution. You can leave us a message to get more hdpe double wall corrugated pipe specifications  in Malaysia.

HDPE pipe foundation construction

The outer wall of the HDPE double wall corrugated pipe has a ring-shaped corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the pipe's resistance to soil load. However, due to the limited surface properties, the resistance to hard protrusions is insufficient, and the surface of the pipe is often pierced by sharp objects. In order to reduce the occurrence of such accidents, the pipeline foundation should be used as a cushion foundation during construction. The author uses different types of foundations as a reference to discuss the methods of pipeline foundations under different foundation environments.

1.1 Foundation Excavation

The elevation of the base should be strictly controlled when excavating the soil tank, and over-excavation is strictly prohibited. The undisturbed soil with a base design elevation of 0.2 m to 0.3 m should be manually cleared to the design elevation. If local over-excavation or disturbance occurs, natural graded sand and gravel or medium and coarse sand with a particle size of 100 mm to 150 rtffn can be replaced. And tamp down. When manually opening the groove, it is advisable to mix the upper part of the groove with soil and the lower part of the groove to be piled up with high-quality soil separately for the same filling. Quickly, and take measures to prevent bubble tanks. Once bubble tanks occur, the water should be drained, the soil layer softened by bubbles should be removed, and sand and gravel or medium-coarse sand should be replaced to complete the foundation treatment. General provisions. The minimum pipe top cover soil thickness for double wall drainage pipe embedding is: the buried depth of the pipe top buried under the roadway shall not be less than 0.9 meters; the pipe buried under the sidewalk or the branch pipe of the pipe shall not be less than 0.75 meters; Less than 0.6 meters; in permafrost or seasonally frozen ground, the buried depth of the pipe top should be below the freezing line. You can leave us a message to get more hdpe double wall corrugated pipe specifications  in Malaysia.

1.2 Basic practice

1.2.1 General Base

The pipeline foundation adopts the cushion foundation. For general soil quality, the base plain soil shall be rammed and a layer of sand cushion shall be laid with a thickness of 100 rain to 150 mln. At the joint part of the pipeline foundation, grooves should be reserved for the joint operation. The width of the groove is about 0.4m to 0.6m, the depth of the groove is about 0.05m to 0.10m, and the length of the groove is about 1.1 times the diameter of the pipe. The groove is after the interface is complete. Then fill it with sand.

1.2.2 Soft soil foundation

For soft ground, when the bottom of the tank is below the groundwater level, lay a layer of gravel or gravel. Its thickness is not less than 150mln, the particle size of crushed stone is 5mml~40Inln, and the sand cushion layer (medium and coarse sand) on it is 20 Bin. The upper part of the sand cushion is the same as the general foundation.

2. HDPE pipe construction

Before the pipeline is put into the trench, the pipeline should first be fully inspected, in the case that no defects are found. Pipelines are allowed to be hoisted or rolled into trenches. The pipes are usually pre-connected on the ground, sometimes the pipes may be pre-connected into many pipe sections about 150 meters long, stored in a certain place, and then transported to the installation site when they need to be lowered and connected, and then hot-melt connected or mechanically connect these pipe segments. Pipes with a nominal diameter of less than 20 mm can be dragged into the trench by hand; for all large pipes, fittings, valves, fire hydrants and fittings, appropriate - [tools should be used to carefully place them in the trench; for long distances It is recommended to use nylon ropes for the hoisting of pipes. You can leave us a message to get more hdpe double wall corrugated pipe specifications in Malaysia.

2.1 Pipe interface

The pipe can be connected by rubber ring or hot melt. The rubber ring is made of synthetic rubber products with acid and alkali corrosion resistance, and the hardness is 50 4-5 MPa. The rubber ring must have a dense texture and a smooth surface without air holes, bubbles or other defects. The rubber ring must be installed in the first groove of the bellows insertion pipe end, and the inner wall of bearing 13 and the outer edge of the rubber ring need to be coated with lubricant during installation. The pipe must be socketed to the root of the socket. When working on the interface, the rubber ring should be tightly set on one side of the nozzle, and the other should be adjusted.

One side of the pipe, so that the two sides of the pipe are on the same axis, then put on the rubber ring, adjust the rubber ring to make it tightly bonded to the outer wall of the pipe, and finally put on the Huff external solid pipe hoop.

2.2 Final pipe connection and assembly

The hot-melt connection of the pipeline in the trench is the same as the hot-melt connection of the pipeline on the ground, but it must be ensured that the connected pipeline must be cooled to the ambient temperature of the soil before connection. The specification of the pipe must be selected according to the operating pressure and the application occasion, and it should have sufficient strength, and the inner wall should be smooth, clean, and free from blisters, rust and other defects. When cutting the pipe, the section should be perpendicular to the axis. When bending the tube, do not bend the tube flat. The entire pipeline should be as short as possible, and the number of turns should be less, and the longer pipeline should be supported and fixed with pipe clamps to avoid vibration. At the same time, room for expansion and contraction should be considered, and any section of pipeline or component in the system should be able to be disassembled and assembled separately. After all the pipelines are installed and positioned, a pressure test and a tightness test should be carried out. For the piping system of the hydraulic system, a secondary installation should be carried out, that is, the pipe is removed for cleaning, and then installed to prevent dirt from entering the pipe. You can leave us a message to get more hdpe double wall corrugated pipe specifications  in Malaysia.

2.3 Connection between pipeline and inspection well

The connection between the pipeline and the inspection well is prone to breakage and improper sealing. Since the HDPE pipe is made of hard material, its compressive strength is far behind that of brick and cement. The usual construction method is to use 1:2.5 cement mortar to connect the well and the pipe tightly. The brickwork of this part of the well wall requires spinning bricks. The author suggests that during construction, an annular hard plastic protection ring should be added at the joint between the outer wall of the pipeline and the inspection well to ensure that the HDPE pipe is intact and undamaged.

Conclusion

As a new type of pipe, HDPE has better indicators in all aspects than the traditional drainage pipes commonly used today. Therefore, the popularization of HDPE pipes should be strengthened to promote the popularization and application of HDPE pipes.