High density polyethylene (HDPE) has excellent chemical stability, aging resistance and resistance to environmental stress cracking. HDPE double-wall corrugated pipes
produced from raw materials are flexible pipes. Its 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 tube, thereby increasing the resistance of the tube to soil loads. In this performance, HDPE double wall corrugated pipe has obvious advantages compared with other pipes.
Low project cost
Under the same load conditions, HDPE double-wall corrugated pipes only need thinner wall to meet the requirements. Therefore, compared with solid wall tubes of the same material specification, half of the raw materials can be saved, so the cost of HDPE double wall corrugated tubes is also very low. This is another outstanding feature of the pipeline.
HDPE double-wall corrugated pipe is light in weight, easy to operate and connect, fast in structure and simple in maintenance work. Tightness and construction during construction
In harsh conditions, the advantages are even more obvious.
Small friction coefficient and large flow
HDPE double-wall bellows made of HDPE can pass a greater flow rate than other pipes of the same diameter. In other words, HDPE double-wall corrugated pipes with relatively small calibers can be used with the same flow requirements.
Low temperature impact resistance
The embrittlement temperature of HDPE double wall corrugated pipe is -70 ℃. Under normal low temperature conditions (above -30 ° C), no special protection measures are needed, and winter construction is convenient. Moreover, HDPE double-wall corrugated pipes have good impact resistance.
Good chemical stability
Since HDPE molecules have no polarity, they have excellent chemical stability. With the exception of a few strong oxidants, most chemical media are non-destructive. Generally, the soil, electricity, acid, and alkali factors in the use environment will not damage the pipeline, will not produce bacteria, will not scale, and the circulation area will not decrease with the increase of operating time.
HDPE double-wall bellows can be used for more than 50 years without being exposed to sunlight and ultraviolet rays.
Excellent abrasion resistance
Germany has used tests to prove that the wear resistance of HDPE is even several times higher than that of steel pipes.
A certain length of HDPE double-wall corrugated pipe can be slightly deflected in the axial direction, and it is not affected by the uneven settlement of the ground to a certain extent. It can be placed directly in a slightly uneven groove without the need for a pipe joint.
HDPE double-wall corrugated pipes for drainage use polyethylene resin as the main raw material, add appropriate additives, extrude and apply to new pipelines, and are used for outdoor drainage and urban sewage in buildings. It has the advantages of light weight, small drainage resistance, high compressive strength, corrosion resistance and convenient construction. It is an ideal material to replace cast iron pipes and cement concrete pipes.
HDPE structural wall pipe has more economic and social benefits than cement cannula
First, greatly shorten the construction period and reduce the difficulty of construction
The HDPE double wall corrugated pipe is much lighter than the cement pipe, so it is very easy to insert, so the construction difficulty is greatly reduced. The HDPE double wall corrugated pipe is as short as 6 meters and the cement pipe is 2.5 meters long, which greatly shortens the construction cycle. Secondly, HDPE double wall bellows are not needed at the bottom of the trench
As the cement pipe is a steel pipe, in order to ensure the effect of the casing, the bottom of the trench must be flat, and it is best to lay the base layer, and the construction staff must have absolute responsibility. HDPE double wall corrugated pipe is a kind of flexible pipe, which is not needed at the bottom of the groove.
Third, HDPE pipelines will not disrupt ground subsidence or crustal changes
The elongation of HDPE pipe is more than 20 times that of steel pipe, and six and a half times that of PVC. Its elongation at break is very high and the elongation is very strong. This means that when the ground subsides or an earthquake occurs, the HDPE pipe can deform with resistance without breaking when the crust changes. This is far superior to steel pipes and also to PVC pipes with significant brittleness. This performance has been confirmed at home and abroad (the Hanshin earthquake in Japan did not cause the pipeline to rupture; the high-density polyethylene pipeline was not damaged during the Baoshan earthquake in Zhinan).
Fourth, the permeability of HDPE pipes is much lower than that of cement pipes, and is less than 2%, which will not cause secondary pollution to groundwater.
Cement pipes are inelastic. Although it is equipped with a rubber ring, the sealing effect is poor. Especially for construction workers, due to the heavy weight of cement pipes, it is not easy to construct. Due to the effect of the socket, the effect of the socket is lost, thereby improving the permeability of the pipeline.
5. HDPE pipe has a service life of more than 50 years.
The safety of PE pipes has lasted for more than 50 years. This has been proven not only by international standards and the new international, but also by advanced countries. The service life of cement management is 20 years, but it is a silicate type, which has been corroded by acid and alkali for a long time, and the service life is greatly reduced. There are examples of cement pipelines in the country that need to be replaced due to sewage leakage, and the interface is broken and must be replaced within a few years.
6, HDPE tube has a smooth inner surface, no positive and negative cells, no scaling
Cement pipes are prone to fouling, and after fouling, the pipe diameter decreases, which affects the flow rate.
Seven, HDPE is light weight, easy to transport and install, no loss
Cement pipes are heavy, difficult to transport and install, and easy to lose during transport and installation.
8. When the pipeline passes the same flow, slope and buried depth, HDPE can be one to two smaller than the cement pipe.
The inner surface roughness coefficient of HDPE is 0.009, and the inner surface roughness coefficient of cement pipe is 0.014. The same flow calculation is performed according to the world-recognized Xie Cai's law. HDPE pipes can be two sizes smaller than cement pipes. In practical applications, a small model is recommended. Just right. For example, a 600-diameter cement pipe can be replaced with a 500-diameter HDPE.
Double-wall corrugated pipes are mainly used for large-scale water transportation, water supply, drainage, sewage, exhaust, subway ventilation, mine ventilation, farmland irrigation, etc. The working pressure is less than 0.6MPa.
1. Municipal engineering: used as drainage and sewage pipes.
2. Construction: used as building rainwater pipes, underground drainage pipes, sewage pipes and ventilation pipes.
Railway and highway communication equipment: used as a protective tube for communication and optical cables. Double wall corrugated pipe
Double wall corrugated pipe
4. Industry: It is widely used in sewage pipes in chemical, hospital, environmental protection and other industries.
5. Agricultural Park Project: For farmland, fruit tea plantation and forest belt emissions.
6. Road works: used as seepage and drainage pipes for railways and highways.
7. Mine: Used as mine ventilation, gas supply and drainage pipes.
8. Double-wall corrugated pipe with opening: it can be used as the seepage drainage pipe of saline-alkali highway.
9. Golf course and football field projects: Used as water seepage and drainage pipes for golf courses and football fields.