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Plastic pipes to replace traditional pipes will be a new development trend
The historical experience of countries in the world in the process of modernization shows that the development speed of plastic pipes has exceeded the economic development speed of the same period. It is an irresistible trend to replace traditional pipes with plastic pipes. Even in developed countries where dense plastic pipe networks have been built, the application of plastic pipes is still increasing year by year. For example, in 1986, the total consumption of plastic pipes in Europe was 2.134 million tons, which increased to 3.465 million tons in 1998, with an average annual growth rate of 5.2%. , Exceeding the national economic growth rate over the same period. In the past 10 years, the average annual growth rate of China's plastic pipe market was 20%. In 2000, 2002 and 2003, the output reached 700,000-800,000 tons, 1.3 million tons and 1.5 million tons, respectively, with a growth rate of 15%. Among them, PVC pipes account for 55% and PE pipes account for 40%. It is estimated that before 2010, the average annual growth rate of domestic plastic pipes will still exceed 20%.
The advantages of plastic pipes
Plastic buried pipes have been widely used abroad. The reason is that buried pipes have many advantages over traditional buried pipes such as cast iron pipes, steel pipes, and cement pipes:
Strength and rigidity
On the surface, the strength and rigidity of plastic buried pipes are not as good as cement pipes, especially reinforced concrete pipes. In fact, plastic buried pipes are "flexible pipes". Under correct design and laying, the plastic buried pipes and the surrounding soil can bear it together. Therefore, plastic buried pipes do not need to have the same strength and rigidity as concrete pipes and other "rigid pipes" to meet the mechanical performance requirements in buried use.
Hydraulic characteristics Plastic pipes have smooth inner walls, low resistance, and large water flow. Under the same diameter, the water flow of plastic pipes is greater than that of concrete pipes. When the terrain has slopes, the diameter of plastic pipes can be reduced and the construction volume is smaller.
The sealing performance of the sealed cement pipe is very poor. The domestic concrete pipe with flat joint only needs to be sealed with a ring of concrete at the joint. It is difficult to ensure no leakage during construction. In addition, the rigid pipe of the concrete pipe system moves slightly (such as uneven soil settlement) It can cause damage to the connection. In addition, the cement pipe is sealed with a vulcanized rubber ring, and the plastic pipe is sealed with a thermoplastic elastomer sealing ring. The service life of the former is shorter than the latter, and the connection and sealing of the plastic pipe have a series of strict requirements to maximize It is guaranteed that no leakage will occur. The life of cement pipe is only 15 years, and the life of plastic pipe is as long as 50-100 years. Domestic sewage and rainwater are usually corrosive, and industrial sewage is more corrosive. Metal and cement buried drainage pipes are used for transportation, and the corrosion resistance is worse than that of plastic pipes. The outdoor natural environment in some areas is very corrosive. For example, when reclaiming land from the sea in Tanggu New District, Tianjin City, the cement drainage pipes cannot be found after 3 years, and they are all corroded by the salt in the sea water. Plastic pipes have to be laid again. .
Laying construction
Plastic pipe is light in weight, large in length, few joints, low requirements on pipe trenches, convenient connection, quick construction, low construction cost, and its superiority in urban and harsh natural conditions is more prominent.
Comprehensive economy
In terms of comprehensive economy, the advantages of plastic pipes are being recognized by more and more users. Although the unit price of plastic pipe is slightly higher than that of cement pipe, the total project cost is not higher than that of cement pipe. The Tianjin Municipal Engineering Design Institute has conducted systematic research on UPVC double-wall corrugated pipes in 1992 and PE double-wall corrugated pipes in buried drainage pipes since 1998. The conclusion is: "The engineering cost of double-wall corrugated pipes is comparable to that of concrete flat openings. The pipe is equivalent, 30% lower than the socket concrete pipe. The construction period is significantly shortened and the economic benefits are significant."
Large-caliber outdoor PE buried pipe is the world development trend
In the past 10 years, an obvious international development trend of plastic pipes is the rapid development of water supply and gas PE pipes. Since the 1998 Munich International Coal Union LGU Gas Distribution Committee meeting unanimously recommended the use of PE buried gas pipelines as distribution pipes, after more than 10 years of research and development in various countries in the world, PE pipelines have developed into multiple varieties and multiple application fields. From the beginning of gas distribution, PE pipelines have entered the fields of urban water supply and drainage, farmland irrigation, sewage discharge, mining and oil fields, floor heating, chemical and pharmaceutical industries. Statistics show that PE pipes increase at a rate of 10%-15% every year.
More news
2020-12-07
Characteristics and connection method of PE gas pipe
1. Features of PE gas pipe
1. Good hygiene performance: no heavy metal salt stabilizer is added during PE pipe processing, the material is non-toxic, no scaling layer, no bacteria breeding, and it solves the secondary pollution of urban drinking water.
2. Corrosion resistance: Except for a few strong oxidants, it can withstand the erosion of a variety of chemical media; no electrochemical corrosion.
3. Long service life: PE pipes can be used safely for more than 50 years under rated temperature and pressure conditions.
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2020-12-07
PE gas pipe hdpe gas pipe
PE gas pipe adopts gas polyethylene pipe with many excellent properties and is used in the field of gas transportation. The corrosion of steel pipes and cast iron pipes and the leakage of joints will be completely solved, thus ensuring the safe operation of the gas pipeline network system. The PE material selected for the PE gas pipe is an inert material, which can withstand the erosion of a variety of chemical media.
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2018-03-22
Ways to reduce the noise of PVC drainage pipes
While adding stabilizers to improve the chemical stability and strength of pvc pipes, the sound insulation performance of the plastic itself has been greatly weakened. Therefore, in the current situation of reliable mechanical performance of pvc drainage pipes, how to solve the problem of sound insulation and noise reduction has become a top priority. The author believes that we can start with the noise source and adopt the following improvement measures to improve its sound insulation performance:
①It is made into double-wall hollow sound-proof PVC drainage pipe
The special equipment for PVC pipe extrusion is modified, an intermediate mold is added between the inner and outer jacket, and the outer mold is modified to increase the intermediate distance to form a hollow cavity between the two walls, so that the plasticity of PVC will not be changed. But it can increase the damping of the pipe along the flow direction, thereby increasing
Strong sound insulation effect.
Using single-wall double-material PVC pipe
On the basis of the original single-wall PVC pipe, a secondary formula is carried out, that is, the porous sound-absorbing material formed by plastic foaming technology is used to increase the wall thickness to achieve the purpose of increasing the damping along the outer wall direction, so as to obtain a good sound insulation effect. A set of equipment needs to be added, thus increasing the manufacturing cost.
Muffled PVC drainage pipe
The PVC pipe is made into a muffled drainage pipe with spiral fins attached to the inner wall. At this time, its outer wall is still a PVC hard plastic pipe (to ensure the required strength of the drainage pipe), but a certain width of flexible and strong soft is attached to the inner wall Plastic spiral belt, which unloads part of the impact pressure of the water flow onto the spiral belt, thereby buffering the pipe wall.
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2018-03-22
What is the difference between PVC water supply pipe and PVC drainage pipe
1. Different purposes: one for water supply and one for drainage. PVC water supply pipes are mainly used for: a. Indoor water supply and reclaimed water systems for civil and industrial buildings; b. Buried water supply systems for residential quarters and factories; c. Urban water supply pipeline systems; d. Water treatment plant water treatment pipeline systems; e. Marine aquaculture; f. Garden irrigation, well sinking and other industrial pipes. PVC drainage pipes are mainly used for building drainage and domestic sewage drainage.
2. Different specifications: PVC water supply pipes have more specifications and models, and PVC drainage pipes have relatively fewer specifications and models, because the drainage system itself does not require too many specifications. Even with the same model (outer diameter), the wall thickness of the water supply pipe and the drain pipe are often different, because the water supply pipe requires pressure, and the drain pipe usually does not need to consider the pressure.
3. The price is different: This will not be explained in detail, and the specific price can be consulted by each manufacturer.
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