Overview of PE Double Wall Corrugated Pipe
Abbreviation: High-density polyethylene (HDPE) double-wall corrugated pipe. The so-called PE double-walled wave tube is a kind of smooth and flat inner wall with trapezoidal or arc-shaped corrugated ribs on the premise of optimizing the cross-section of the pipe on the premise of saving raw materials without reducing the ring stiffness of the pipe. The corrugated wall of the outer wall is hollow and is made by the extrusion molding process. Because its main raw material is polyethylene (PE), it is simply referred to as PE double-wall corrugated pipe. Referred to as PE corrugated pipe History review: HDPE double-wall corrugated pipe is a new type of pipe with a ring-shaped outer wall and a smooth inner wall. It was first successfully developed in Germany in the early 1980s. After more than ten years of development and improvement, it has developed from a single variety to a complete product series. At present, it is very mature in the production process and uses technology. Due to its excellent performance and relatively economical cost, it has been greatly promoted and applied not only in developed countries such as Europe and the United States but also around the world.
With in-depth research, double-wall corrugated pipe equipment suitable for more materials has been developed, such as PVC， PP double-wall corrugated pipe equipment is also widely used around the world.
All over the world, the promotion and application of HDPE, PVC and PP double-wall (dual wall) corrugated pipes are on the rise, and all technical indicators have reached the standard of use. The color of the inner wall of the double-wall corrugated pipe is usually blue and black, and some brands will use the inner wall of yellow.
Double-wall corrugated pipe is a new type of lightweight pipe made of high-density PE, PP and PVC. It has the characteristics of lightweight, high-pressure resistance, good toughness, fast construction and long service life. Its excellent pipe wall structure design, and compared pipes with other structures, the cost is greatly reduced. And because the connection is convenient and reliable, it is widely used at home and abroad. Substantial replacement for concrete and cast iron pipes.
Performance & Features
Performance
- Unique product structure and strong pressure resistance;
- The inner wall is smooth and the flow rate is large;
The double-wall corrugated pipe is easy to connect, the interface is well sealed, corrosion resistance, zero leakage, no scaling, avoids secondary pollution, and it is an ideal “green pipe”;
- The double-wall corrugated pipe has good flexural properties and can adapt to the uneven settlement of soil;
- Long service life, buried use can reach more than 50 years;
- The double-wall corrugated pipe is light in weight and convenient for construction, which can reduce the construction cost and shorten the construction period;
- At a speed of 15 feet/second, the wear resistance is 3 to 5 times higher than that of ordinary or fine-grained steel pipes.
Technology
- Digital centralized control across the board
- Double-machine co-extrusion, double-layer diversion
- Full vacuum track drive
- Online flaring
Features
PE, PP and PVC double-wall corrugated pipes have excellent chemical stability, aging resistance and environmental stress cracking resistance. The plastic double-wall corrugated pipe produced is a flexible pipe. Its main performance is as follows:
Strong resistance to external pressure
The outer wall has a ring-shaped corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the resistance of the pipe to soil load. In this performance, the HDPE double-wall corrugated pipe has obvious advantages compared with other pipes.
Easy to construct
Due to the light weight of the plastic double-wall corrugated pipe, the handling and connection are very convenient, so the construction is fast and the maintenance work is simple. Tight schedule and construction In the case of poor conditions, its advantages are even more obvious.
Small friction coefficient, large flow
The plastic double-wall corrugated pipe can pass a larger flow than other pipes of the same diameter. In other words, under the same flow requirements, plastic double-wall corrugated pipes with relatively small diameters can be used.
Good low-temperature resistance and impact resistance
The embrittlement temperature of the plastic double-wall corrugated pipe is about -70°C. Generally, it is not necessary to take special protective measures during construction under low temperature conditions (above -30 ℃), and construction in winter is convenient. Moreover, the plastic double-wall corrugated pipe has good impact resistance.
Good chemical stability
Since plastic molecules are not polar, they are chemically stable. Except for a few strong oxidants, most chemical media have no destructive effect on them. The soil, electricity, acid and alkali factors of the general use environment will not damage the pipeline, breed bacteria, and scale, and its flow area will not decrease with the increase of operating time.
Long service life
The service life of plastic double-wall corrugated pipes can reach more than 50 years under the condition of not being exposed to sunlight and ultraviolet rays.
Excellent wear resistance
Germany has used tests to prove that the wear resistance of HDPE is even several times higher than that of steel pipes.
Proper deflection
A certain length of plastic double-wall corrugated pipe can be slightly deflected in the axial direction, not affected by a certain degree of uneven settlement on the ground, and can be directly laid in a slightly uneven groove without pipe fittings.
Advantages
- Unique structure, high external pressure resistance, impact resistance, ring flexibility, smooth inner wall and low friction, pipes of the same inner diameter can pass through a larger flow; socket interface, flexible connection, convenient connection, high reliability, not easy to leak.
- Light weight, fast construction and low cost.
- The buried service life of more than 50 years.
- Polyethylene is a hydrocarbon polymer, the molecule is non-polar, and it is resistant to acid and alkali corrosion.
- The raw materials are green and environmentally friendly materials, non-toxic, non-corrosive, non-scaling, and can be recycled and reused.
- The applicable temperature range is wide, the pipeline will not break in the environment of -60 °C, and the maximum temperature of the conveying medium is 60 °C.
- The cost of the comprehensive project is basically the same as that of concrete, and the operating cost is low.
- No foundation is required under the condition of good soil quality.
Scope of application
- Municipal drainage and sewage pipeline system engineering;
- Drainage and sewage are buried underground in apartments and residential quarters;
- Pre-buried pipelines of expressways, underground water seepage pipe network of golf courses;
- Water conservancy projects such as farmland water conservancy irrigation, water supply and drainage;
- The Chemical industry and mine are used for fluid transportation and ventilation, etc.;
- Protective casing of underground pipelines and communication cable casings, etc.
Storage method
Plastic double-wall corrugated pipes should be stored in a dry warehouse at room temperature. Straight pipes should be laid flat, and the stacking height should not exceed 2 m. Disassembled and coiled porous tubes can be laid flat, but should avoid heavy pressure or compression stacking. plastic double-wall corrugated pipes are not allowed to be mixed with toxic and harmful substances, and should be kept away from heat sources. A striking fire prohibition sign should be set up in the storage place. The storage period shall generally not exceed 2 years from the date of production.
Shipping method
Plastic double wall corrugated pipe can be transported by various vehicles. During transportation, loading and unloading, it is not allowed to throw, hit, press, expose for a long time or get close to heat sources. Mixed transport with toxic and hazardous substances is not allowed. The perforated tube in the form of a disc cannot be transported flat.
Connecting method
The socket connection is as follows (DN≤500): Plastic double-wall corrugated pipe joints should be socket-type interfaces connected by elastic sealing rubber rings, and the rubber ring interfaces should comply with the following regulations:
Plastic （PE, PP, PVC）double-wall corrugated pipe flare
- Before connecting the interface, check whether the rubber ring is in good condition, and confirm the position of the rubber ring and the insertion depth of the socket.
- When connecting, first clean the inner wall of the socket, apply lubricant on the inner wall of the socket and the rubber ring of the socket, and then align the central axis of the end face of the socket and socket.
- The connecting method should be carried out according to the following procedures: For pipes of DN400 and below, first, one person hangs the socket of the installed pipe with a cotton yarn rope, and the other person uses a long crowbar to insert the foundation obliquely, and press against the center of the pipe end Then, forcefully insert the pipe slowly into the socket of the plastic double-wall corrugated pipe to be installed to the predetermined position; for pipes above DN400, two lever hoists can be used to pull the pipe section into place. When the connector is closed, the lever hoists on both sides of the pipe section should be pulled synchronously, so that the rubber sealing ring is correctly seated, and does not twist or fall off.
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