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On a variety of features and application of plastic pipe

Abstract: brief introduction to the rigid PVC pipe (UPVC), core layer foam pipe (PSP), PVC silencer pipe, corrugated plastic pipe, chlorinated polyvinyl vinyl tube (CPVC), high-density vinyl tube to take (HDPE), cross-linked polyethylene pipe (PEX), steel-plastic composite pipe, aluminum plastic composite pipe (PAP), random copolymer polypropylene tubes (PPR), polybutylene pipe (PB) plastic pipe such as the development of several common form, features (merits), and the application were introduced to our readers in on the selection and use of plastic pipe, can provide little help.
Keywords: Pipe Plastic Pipe PVC core layer foam pipe PSP UPVC plastic corrugated pipe

<SPAN Style=Drainage from the National Science and Technology Commission will be building applications with a hard polyethylene pipe technology in the three stages. Coordination Unit of the National Chemical Building Materials: By 2005, various types of plastic pipe pipeline in the country 50% market share. <SPAN Style=resistance, energy conservation, save metal and improve the living conditions, long service life, convenient installation, by the favor of the pipeline engineering. For this reason, many developed countries and pipeline engineering plastics business to a wide range of cooperation, put a lot of manpower, material and financial resources for comprehensive research and development, the synthetic production of raw materials, pipe fittings manufacturing technology, design theory and construction techniques Fangmian been developed and perfected, and has accumulated a wealth of practical experience, make plastic pipe in the pipeline project occupies a very important position, and the formation of a irresistible trend of development. I collected several We use a wide range of plastic pipe compared the characteristics you want to be able to design, supervision, construction and other construction industry peers in the selection and use of plastic pipe can be of help. 1,p90x workout calendar, rigid PVC pipe (UPVC) in the world, hard PVC pipe (UPVC) is the consumption of all kinds of plastic pipe in the largest species, is also both at home and abroad to develop the new chemical materials. With this pipe, can China's steel shortage, energy shortage ease the situation a positive role in significant economic benefits. 1.1UPVC tube has the following characteristics: 1.1.1 chemical corrosion, no rust; 1.1.2 with self-extinguishing and flame retardant; 1.1.3 and good resistance to aging can be used between -15 ℃ -60 ℃ 20-50 years; 1.1.4 wall smooth, inner wall surface tension, it is difficult to form scale, fluid transport capacity than the cast iron pipe with high 43.7%; 1.1. 5, light weight, easy to flare, bonding, bending, welding, pipe installation work is only 1 / 2, low labor intensity, short construction period; 1.1.6 good electrical properties of resistance, volume resistivity 1-3 × 105Ω. cm, the breakdown voltage 23-2kv/mm; 1.1.7 low price; 1.1.8 Energy saving metal; 1.1.9 UPVC pipe toughness low linear expansion coefficient, temperature range narrow. 1.2 PVC pipe (UPVC) The main application areas: 1.2.1 building to the sewer system; 1.2.2 building drainage systems; 1.2.3 building electrical wiring pipe ; 1.2.4 air conditioner condensation water system 2, core layer foam pipe (PSP) core layer foam pipe co-extrusion process is the use of production, the same as ordinary UPVC outer and inner layers, the middle is a relatively low density foam layer 0.7-0.9 a new pipe. Because the material used in the structure of type Ⅰ mechanics structural principle, and has the effect energy absorption foam insulation core, so gradually become replaced by cast iron pipes, rigid PVC pipes and other solid wall of a plastic pipe. 2.1 core layer foam pipe (PSP) has the following characteristics: 2.1.1 impact strength is significantly enhanced: the ring to the rigid UPVC pipe to 8 times normal. 2.1.2 use a wide range: -30 ℃ -100 ℃ can be used, and changes in temperature, good dimensional stability. 2.1.3 foam core layer can effectively block noise transmission, but also conducive to high-rise building drainage systems. 2.1.4 good heat insulation, solid wall than non-foaming low heat transfer efficiency 35% tubes. 2.1.5 compression foam core to increase the capacity of the inner wall. 2.1.6 solid wall pipe can save more than 25% of raw materials, the larger the diameter of raw materials to save more. 2.1.7 pipe lighter, easy to transport and install. 2.1.8 the service life of the bending state is longer than the solid wall pipe more than a decade. 2.2 core layer foam pipe (PSP) The main application areas; 2.2.1 civil construction of the drainage system; 2.2.2 industrial protective and transportation of liquid; 2.2.3 porous irrigation agriculture , irrigation and drainage; 2.2.4 power and communication cable conduit. 3, PVC pipe silencer PVC silencer tube is South Korea in the early 70s developed a new type of building drainage pipe, has been made in Japan, Germany, France, Switzerland and other countries patents, patent by China in 1990. UPVC pipe wall with six triangular silencer convex spiral, so that the inner wall of water along the continuous spiral flow freely, the water drainage conditions form the best rotation to the bottom of the riser to play the role of good energy dissipation, noise reduction . Meanwhile, the unique structure of silencer tube can make the column of air in the tube directly into the central formation is not necessary as they used to set other special tube, so that high-rise building drainage capacity increased by 10 times, 6 times increased displacement noise than ordinary UPVC drainage pipe and cast iron pipe with low 30-40Db. UPVC pipe muffler pipe and supporting the use of silencers, the water effect is good. 3.1 PVC tube with UPV muffler also features both the following characteristics: 3.1.1 with water capacity, high fluid transport capacity; 3.1.2 High-Vent; 3.1.3 silencer insulation; 3.1.4 economy, save energy; 3.1.5 Construction and maintenance will easily; 3.1.6 can withstand the temperature and settlement building. Do not set expansion joint. 3.2 is mainly used for PVC sewer pipe silencer systems, especially high-rise building sewer systems.
<SPAN Style=using a special . According to the different forming methods can be divided into single-wedge bellows, double-wall corrugated pipe. 4.1 Features of plastic corrugated pipe: 4.1.1 Rigid both, both have sufficient mechanical properties at the same time, both excellent flexibility; 4.1.2, compared with the plate pipe, per unit length Bellows light weight, saving materials, reduced energy consumption, the price is cheap; 4.1.3 smooth wall corrugated pipe can reduce the flow resistance of liquid in the tube to further enhance the transportation capacity; 4.1.4 Chemical Resistance strong, can withstand the impact of soil pH; 4.1.5 corrugated pipe shape can enhance the load resistance of the soil, without increasing its flex, so laid in a row on the uneven ground; 4.1.6 interface, convenient and good sealing performance, easy handling, easy installation, reduce labor intensity and shorten the construction period; 4.1.7 Wide temperature range, fire-retardant, self-extinguishing, use of safety; 4.1. 8 electrical insulation properties, is an ideal material for electric wire. 4.2 The main application areas in plastic: 4.2.1 Services to the sewer system; 4.2.2 building electrical wire and piping; 4.2.3 Automotive pipeline irrigation 4.2.4 Piping; 5, chlorinated polyvinyl chloride pipe (CPVC) chlorinated by the chlorine content of PVC pipe up to 66% of the so-called vinyl chloride resin processing and get a good heat resistance of plastic pipe. PVC resin, vinyl chloride resin was prepared by chlorination, with the increase of chlorine content in the resin, its density, softening point, heat resistance and flame resistance increased, tensile strength, melt viscosity increased chemical resistance and good in the boiling water is not deformed. 5.1 Characteristics of Chlorinated Polyvinyl Chloride Pipe: 5.1.1 Wide temperature range: -40 ℃ -95 ℃; 5.1.2 has good strength and toughness; 5.1.3 Good chemical resistance; 5.1.4 for the self-extinguishing flame retardant; 5.1.5 Performance of low thermal conductivity, about steel 1 / 200; 5.1.6 Medium Heavy Ion content of ultrapure water standards; 5.1.7 Health and performance in line with national health standards; 5.1.8 clean smooth flat wall: transmission fluid, have a smaller friction and adhesion; 5.1 .9 light weight: the equivalent of steel 1 / 5, steel 1 / 6; 5.1.10 Easy installation: can be bonded, thread, welding, etc. connected; 5.1.11 excellent aging and UV resistance, the normal service life longer. 5.2 CPVC pipe main application areas: 5.2.1 building air conditioning systems, water piping systems, ground water into the pipes, swimming pools and hot pipe; 5.2.2 industrial piping systems; 5.2.3 Food processing piping system; 5.2.4 water supply and wastewater treatment plant piping system; 5.2.5 irrigation. 6, high density polyethylene pipe (HDPE) high-density polyethylene pipe with its excellent chemical properties, toughness, wear resistance and low prices and installation costs by pipeline world attention, it is second only to PVC, the use of plastic pipe materials accounted for the second. High-density polyethylene pipe (HDPE) double wall corrugated pipe is a province of the use of materials, high rigidity, bending of the fine, with a corrugated wall, smooth inner wall of the pipe. Double-wall pipe with the same specifications than the normal strength of 40% material saving tube, with a high impact, high-compression characteristics of fast development. In Europe and the United States, HDPE double wall corrugated pipe, replacing a considerable range of steel, cast iron pipes, cement pipes, asbestos management and general plastic pipe, widely used as drainage pipes, sewage pipes, underground cables, pipes, agricultural irrigation and drainage tube. 7, sub-cross-linked polyethylene (PEX) cross-linked polyethylene pipe has a good health as mechanical and physical properties, is considered a new generation of green pipe. Production cross-linked polyethylene pipe (PEX) is the main raw material HDPE, and the initiator, crosslinking agent, catalyst and other additives, the use of the world's advanced one step (MONSOIL method) technology, the use of ordinary polyethylene raw materials by adding silane access sticks material, the macromolecular chains in the polymer chemical covalent bond formed between to replace the original van der Waals forces to form three-dimensional network structure of the text chain cross-linked polyethylene, the crosslinking degree of up to 60% -89%, so that its excellent physical and chemical properties. 7.1 cross-linked polyethylene pipe of the main features: 7.1.1 Wide temperature range, -70 ℃ -95 ℃ in the long-term use; 7.1.2 texture firm and patient resistance to internal pressure high strength, 20 ℃ when the burst pressure is greater than 5Mpa, 95 ℃ when the burst pressure is greater than 2Mpa, 95 ℃ under 50 years of life; 7.1.3 does not rust, good resistance to chemical corrosion , excellent resistance to environmental stress cracking, even in the more the temperature can also be used to deliver a variety of chemicals and stress cracking tubes with a variety of accelerated fluid; 7.1.4 pipe wall tension lower than the surface tension difficult to infiltrate a high wall of water that can effectively prevent scale formation. 7.1.5 non-toxic, no mildew, no bacteria, health in line with national standards GB7219-1998 pipe wall is smooth, fluid flow resistance, good mechanical properties of the water in the same diameter, the transmission fluid flow than metal pipe, noise is low; 7.1.7 pipe thermal conductivity much lower than the metal pipe, so its thermal insulation performance, for the heating system, no insulation, heat loss is small; 7.1.8 good memory performance, when the PEX pipe is heated to proper temperature (less than 180 ℃ ) will become transparent, then cooling will be restored to its original shape, that is, any error in the course of the bending can be corrected through the hot air gun, to use more freely; 7.1.9 light weight, easy handling easy to install easy, non-professionals can also be successfully installed, the installation work less than half the amount of metal pipe installation; 7.1.10 cross-linked polyethylene pipe thermal expansion coefficient than the much larger metal pipe, installation left when stretching space. 7.2 cross-linked polyethylene pipe main application areas: 7.2.1 Architecture and drinking hot and cold water piping system; 7.2.2 liquid food in the food industry pipeline; 7.2.3 Plumbing heating system, central air conditioning piping systems, ground radiation; heating systems, solar water heater systems; 7.2.4 telecommunications, electrical piping; 7.2.5 plating, petrochemical and other industrial piping systems. 8, steel-plastic composite pipe on water quality in order to avoid corrosion of galvanized steel (especially hot water, the electrochemical corrosion particularly strong), has developed a plastic composite pipe. Metal and plastic composite pipe is a metal / polymer macro-composites, metal matrix interfacial bonding through the pipe to withstand internal and external pressures, the plastic substrate play a role in the anti-corrosion. It has both hard metal and outspoken is not easy deformation, heat, pressure, anti-static characteristics, but also has a corrosion-resistant plastic, no rust, easy to produce dirt stains, wall smooth, easy to bend, good insulation, cleaning non-toxic, light weight, simple construction, life and long life. UPVC pipe and plastic pipe composite pipe, the maximum temperature is 70 ℃, with the polyethylene powder coating on the inner wall of the plastic pipe can be used under -30 ℃ -55 ℃. The use of epoxy coated steel pipe temperatures up to 100 ℃, can be used as hot water pipes. Except for building steel-plastic composite pipe hot and cold water, heating and air conditioning ducts outside the system is also widely used in chemical and petroleum industries and other fields. 9, aluminum composite pipe (PAP) plastic composite pipe (PAP) is a set of advantages of metal and plastic as one of the new pipe. Plastic composite pipe has five components, the outer wall and inner wall for the chemical cross-linked polyethylene, the middle layer of about 0.3mm thin aluminum welded tube; tube with inner and outer layer of polyethylene adhesives have a solid bond between the . Aluminum plastic composite pipe structure determines both this pipe metal tube plastic pipe and features. Chemical stability of the chemical cross-linked polyethylene in contact with the outside world the inner and outer layer, aluminum layer to avoid contact with the outside world; and the plastic and strength better in the outer metal layer in the middle, on the one hand protection of the outside world corrosion, on the other hand enhance the strength and plastic pipe. 9.1 plastic plastic composite pipe has the following characteristics: 9.1.1 Corrosion resistance: inside and outside the wall was very high chemical stability of cross-linked polyethylene, not only in the water will not corrode, and can resist strong acid and alkali, etc. most corrosive chemical liquids; 9.1.2 does not rebound: good because the plastic tube layers there can be any plastic composite pipe by bending straight or bent by the direct and maintain the shape after the changes, which characteristics for a plate rolling into the clear plastic composite pipe installed for indoor construction is particularly convenient; 9.1.3 deadening good: dense aluminum tubes welded completely prevent the infiltration of outside wall; 9.1. 4, high density: the same diameter and length of the pipe, aluminum pipe composite pipe is about the quality of 1 / 7; 9.1.5 Installation is simple: do not have threading, cutting, connection is easy. Long pipe length, the economy and high; 9.1.6 High temperature: use of cross-linked polyethylene plastic composite pipe production in the medium above 95 ℃ continuously; 9.1.7 reliability: life up to 50 years; 9.1.8 flow resistance: smooth wall without scaling, the same than the diameter of a large metal pipe flow; 9.1.9 appearance: plastic pipe aluminum composite pipe wall can have different colors Ming pipe construction without paint; 9.1.10 easy to detect: with metal aluminum, Buried in the location after construction easily be proved; 9.1.11 antistatic: can be used to transport various types of flammable liquid; 9.2 plastic composite pipe main application areas: 9.2.1 Materials: water, heating and water supply pipe; 9.2.2 gas, natural gas and pipeline gas transmission pipe interior; 9.2.3 Industry pipe; 9.2.4 Chemical: all kinds of acid and alkaline solution delivery; 9.2.5 Medicine: a variety of gas and liquid delivery; 9.2.6 Petrochemical; kerosene, the delivery of gasoline and other fluids; 9.2.7 Marine Pipe: Water transportation of various piping systems pipe 9.2.8 Food industry: transport wine, drinks, etc.; 9.2.9 air conditioning duct systems etc.; 9.2.10 delivery of compressed air and other industrial gases.