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Analysis of technical characteristics of plastic pipe industry
Different from plastics and traditional materials, the pace of technological advancement is faster, and the emergence of new technologies, new materials, and new processes has made the advantages of plastic pipes more traditional than traditional materials. Compared with traditional metal pipes and cement pipes, plastic pipes are light in weight, generally only 1/6-1/10 of metal pipes, have good corrosion resistance, impact resistance and tensile strength, and inner surface ratio of plastic pipes. The cast iron pipe is smooth, the friction coefficient is small, the fluid resistance is small, the water consumption energy can be reduced by more than 5%, the comprehensive energy saving is good, the manufacturing energy consumption is reduced by 75%, the transportation is convenient, the installation is simple, and the service life is up to 30-50 years. . Polyethylene pipes are developing rapidly in countries all over the world. Developed countries have taken an absolute advantage in the application of polyethylene pipes in the water supply and gas fields.
It is understood that polyethylene pipes are not only used to replace traditional steel pipes, cast iron pipes, etc., but also replace PVC pipes. The reason lies in the technological innovation of polyethylene pipes. On the one hand, the material has made significant progress. Through the improvement of the polyethylene polymerization production process, the strength of the polyethylene pipe material has almost doubled. On the other hand, there are new developments in application technology. For example, the technique of laying polyethylene pipes by directional drilling method without using trenches has fully utilized the superiority of polyethylene pipes, making traditional pipes suitable for the application of this method. No competition. There are still many new materials and new technologies being researched, or have been researched and tested. It is certain that the technological progress of plastic pipes in the next 10 years will promote the rapid development of plastic pipes.
Hard polyvinyl chloride pipe (UPVC)
Worldwide, the rigid polyvinyl chloride pipe (UPVC) is the most consumed type of plastic pipes, and it is also a new type of chemical building materials that are being developed at home and abroad. The use of such pipes can positively alleviate the shortage of steel and energy shortage in China, and the economic benefits are remarkable.
UPVC pipes have the following characteristics:
Good chemical corrosion, no rust;
Self-extinguishing and flame retardant;
Good aging resistance, can be used between -15 ° C -60 ° C for 20-50 years;
The inner wall is smooth, the surface tension of the inner wall is difficult to form scale, and the fluid transporting capacity is 43.7% higher than that of the cast iron pipe;
Light weight, easy to expand, bond, bend, weld, installation work is only 1/2 of the steel pipe, low labor intensity, short construction period;
Good electrical resistance, volume resistance 1-3 × 105Ω. Cm, breakdown voltage 23-2kv/mm;
Low price;
Saving metal energy;
The UPVC pipe has low toughness, a large coefficient of linear expansion, and a narrow operating temperature range.
Core foam tube (PSP)
The core foamed tube is produced by a three-layer co-extrusion process. The inner and outer layers are the same as ordinary UPVC, and the middle is a new type of pipe with a relative density of 0.7-0.9 low foaming layer. Since the structure uses the I-type structural principle of material mechanics and has a foaming core layer for energy absorption and sound insulation, it has gradually become a plastic pipe which replaces a cast iron pipe, a hard PVC solid wall pipe, and the like.
The core foam tube (PSP) has the following characteristics:
The impact strength is significantly improved: its hoop stiffness is 8 times that of ordinary UPVC pipes.
Wide range of use: It can be used at -30°C-100°C, and it has good dimensional stability when temperature changes.
The foam core layer can effectively block the noise propagation and is more conducive to the high-rise building drainage system.
The heat insulation is good, and the heat transfer efficiency is 35% lower than that of the non-foamed solid wall pipe.
The foamed core layer greatly increases the pressure resistance of the inner wall.
Compared with real wall pipe, it can save more than 25% of raw materials, and the larger the diameter, the more raw materials are saved.
The pipe is lighter and easy to transport and install.
The service life in the bent state is longer than that of the solid wall pipe.
Hard PVC silencer
The rigid PVC silencer tube is a new type of building drainage pipe developed by Korea in the early 1970s. It has obtained patents in Japan, Germany, France, and Switzerland, and obtained Chinese patents in 1990. The inner wall of the UPVC silencer tube has six triangular convex spiral lines, so that the lower water flows freely and continuously along the inner wall of the tube, and the drainage is rotated to form an optimal drainage condition, thereby playing a good energy dissipation effect at the bottom of the riser and reducing noise. . At the same time, the unique structure of the silencer tube allows the air to form a gas column directly discharged in the center of the tube. It is not necessary to separately set a special vent pipe as in the past, so that the drainage and ventilation capacity of the high-rise building can be increased by 10 times, the displacement can be increased by 6 times, and the noise is more than ordinary UPVC drainage. Tube and cast iron pipe are 30-40Db lower. When the UPVC silencer tube is used together with the silencer pipe fitting, the drainage effect is good.
The rigid PVC silencer has the following features:
High water-passing capacity and fluid transport capacity;
High ventilation capacity;
Silencer sound insulation;
Economy and energy saving;
Construction and maintenance are easy;
Can withstand temperature and settlement deformation of buildings. There is no need to set up a telescopic section.
The rigid PVC silencer tube is mainly used for drainage piping systems, especially for high-rise building drainage piping systems.
Plastic bellows
The plastic bellows adopts a special "annular groove" shaped section in the structural design. This pipe has a novel design and reasonable structure, which breaks through the traditional "plate" structure of ordinary pipes, so that the pipe has sufficient compressive and impact strength. And has good flexibility. According to the different molding methods, it can be divided into single-turn corrugated pipe and double-wall corrugated pipe.
Features of plastic bellows:
Both rigid and soft, both with sufficient mechanical properties, and excellent flexibility;
Compared with the plate type pipe, the bellows per unit length has light weight, saves materials, reduces energy consumption, and is cheap;
The smooth corrugated pipe on the inner wall can reduce the flow resistance of the liquid in the pipe and further improve the conveying capacity;
Strong chemical resistance, can withstand the effects of acid and alkali in the soil;
The corrugated shape can strengthen the pipeline's load resistance to the soil without increasing its flexibility so as to be continuously laid on the uneven ground;
The interface is convenient and the sealing performance is good, the handling is easy, the installation is convenient, the labor intensity is reduced, and the construction period is shortened;
Wide temperature range, flame retardant, self-extinguishing, safe to use;
It has good electrical insulation and is an ideal material for wire bushings.
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Chlorinated polyvinyl chloride pipe (CPVC)
The chlorinated polyvinyl chloride pipe is a heat-resistant plastic pipe obtained by processing a so-called perchloroethylene resin having a chlorine content of up to 66%. The chlorinated polyvinyl chloride resin is obtained by chlorination of PVC resin. As the chlorine content in the resin increases, the density increases, the softening point, heat resistance and flame retardancy increase, the tensile strength increases, and the melt viscosity increases. Large, chemically resistant, and not deformed in boiling water.
Characteristics of chlorinated polyvinyl chloride pipe:
Wide temperature range: -40 ° C -95 ° C;
Has good strength and toughness;
Has good chemical resistance;
The flame retardant performance is self-extinguishing;
Low thermal conductivity, about 1/200 of steel;
The heavy ion content in the medium reaches the ultrapure water standard;
Hygienic performance meets the requirements of national health standards;
The pipe wall is smooth and smooth: it has less frictional resistance and adhesion when conveying fluid;
Light weight: equivalent to 1/5 steel pipe, 1/6 of steel pipe;
Easy to install: it can be connected by bonding, threading, welding, etc.
Excellent aging and UV resistance, long service life.
High density polyethylene pipe (HDPE)
High-density polyethylene pipe is valued by the pipeline industry for its excellent chemical properties, toughness, wear resistance, low cost and installation cost. It is the second largest plastic pipe material after polyvinyl chloride.
The high-density polyethylene pipe (HDPE) double-wall corrugated pipe is a pipe material which is material-saving, high in rigidity, excellent in bending property, and has a corrugated outer wall and a smooth inner wall. The double-walled pipe can save 40% of the ordinary pipe of the same strength and the same strength, and has the characteristics of high impact resistance and high compression resistance, and is developing rapidly. In Europe and the United States, HDPE double-wall corrugated pipes have replaced steel pipes, cast iron pipes, cement pipes, asbestos pipes and ordinary plastic pipes in a considerable range, and are widely used as drainage pipes, sewage pipes, underground cable pipes and agricultural drainage pipes.