I. PE-RT: high temperature resistant polyethylene pipe
Due to its relatively low density, PE-RT tube is very soft and easy to install. But the strength is also low, scratch resistance, scratch ability is worse than PE-X tube; Its cold resistance is good, can be installed at low temperature construction. Because its raw materials can only be imported, the cost is slightly higher than PE-X. It belongs to thermoplastic materials and can be recycled.
Processing: HDPE pipe fitting suppliers add special ingredients (without any additives) to the screw extruder. The biggest advantage is that it does not require cross-linking; The thermal conductivity is twice that of PP-R and PP-B.
PE-RT tubes may be connected by mechanical copper fittings, or by hot melt or electric melt.
Floor heating is commonly used, 10 yuan/meter.
Two, PB: polybutene tube
The softest, the most expensive. PB tube is formed by polymerization of butene-1 monomer. Because of its small production, the price is very high.
The wall thickness is the thinnest under the same design pressure.
PB tube belongs to thermoplastic, processing is very convenient, with ordinary extruder can be processed, can also be recycled.
PB pipe can be connected by mechanical pipe fitting, hot melt or electric melt pipe fitting. In the heating system, mechanical pipe fitting is usually used to connect with water separator.
Iii. PE-X: cross-linked polyethylene pipe
Can not be hot melt connection, can only use metal pipe mechanical connection.
PE: polyethylene pipe
During the processing of PE pipe, no heavy metal salt stabilizer is added, the material is non-toxic, no scaling layer, no bacteria breeding, which can well solve the secondary pollution of urban drinking water. In addition to a few strong oxidants, can withstand the erosion of a variety of chemical media; No electrochemical corrosion. Under the condition of rated temperature and pressure, PE pipeline can be used safely for more than 50 years; PE pipe toughness, high impact strength, heavy objects directly pressed through the pipeline, will not lead to pipeline rupture; The strength of the hot melt or electric melt interface of PE pipe is higher than that of the pipe body, and the joint will not be disconnected due to the action of soil movement or live load; The pipe is light, welding process is simple, construction is convenient, and the comprehensive cost of the project is low.
Five, PPR: random copolymerization polypropylene tube
Cheap price, radiator and domestic hot water used.
PP-R pipe is also called three type polypropylene pipe, using random copolymerization polypropylene by extrusion into pipe, injection molding into pipe fitting. It is a new type of plastic pipe product developed and applied in Europe in the early 1990s. Pp-r is a new generation of pipeline material, which adopts gas phase copolymerization process to randomly polymerize about 5% PE in the molecular chain of PP (random copolymerization). It has good impact resistance and long-term creep performance.
1. Advantages of PPR tube
Moderate price, stable performance, heat and insulation, corrosion resistance, the inner wall is smooth and no scaling, the pipeline system is safe and reliable, no penetration, the service life can be up to 50 years. Known as never scaling, never rust, never leakage, green advanced water supply material.
2, PPR pipe shortcomings
Construction technology requirements are high, special tools and professionals must be used to ensure the safety of the system.
3. PPR pipe application field
Hot and cold water systems of buildings, including central heating systems;
Heating systems in the building, including floor, siding and radiant heating systems;
A potable water supply system;
Central (centralized) air conditioning system;
Industrial piping system for conveying or discharging chemical media.
Six, PVC: polyvinyl chloride pipe
PVC-C resin as the master material, adding punch resistant agent, stabilizer and other auxiliary materials by high speed extrusion.
Its features:
1, strong
As PVC-C is stronger than PP-R, PB and PEX, fewer hooks and brackets are needed. PVC-C is resistant to higher pressures and can use smaller pipe diameters than PP-R, PB, and PEX tubes at the same rate.
2, easy installation
Special fusing agent can be used to connect, installation without special tools, suitable for both plain and dark packaging.
3. Corrosion resistance
PVC-C is not easily permeable to oxygen, so the metal parts in the system will not be corroded due to oxidation.
4, good flame retardant
The oxygen index of PVC-C is 60, and the combustion capacity is very low. It will extinguish immediately from the fire, and will not produce fire drops, which can inhibit the production of smoke and toxic gases.
5, not affected by residual chlorine
Different from polyolefin pipes, PVC-C pipes are not affected by residual chlorine in water after long-term use, and will not crack and leak.
6, acid and alkali resistance
PVC-C has strong anti-corrosion ability for both acid and alkali, and can be used to transport HCL and NaOH liquid.
7. Bacteria are not easy to reproduce
Many tests have proved that PVC-C pipes are not easy for bacteria to breed. The growth rate of bacteria in PVC-C pipes is 1/60 of PEX pipes, 1/10 of copper pipes and 1/4 of steel pipes. The amount of legionella in water samples was 1/13 of that in PEX tube and 1/17 of that in PP-R tube.
8, low coefficient of thermal expansion and aging resistance
Compared with other plastic pipes, the thermal expansion coefficient of PVC-C pipe is smaller, about 1/2 of PP-R, PB, PEX and other plastic pipes. PVC-C tubes have strong UV resistance and can be used outdoors, while ordinary polyolefin tubes cannot.
9. Superior hygienic performance standards
PVC-C hot and cold water pipes have been tested by many international water quality authorities, and the results are better than the World Health Organization and the Ministry of Health of the People's Republic of China and other institutions for drinking water standards.
UPVC: hard polyvinyl chloride pipe
Building water supply and drainage, rainwater system.
PVC-U pipe is made of sanitary polyvinyl chloride (PVC) resin as the main raw material, adding appropriate amount of stabilizer, lubricant, filler, color enhancer and so on through the plastic extruder extrusion molding and injection molding machine injection molding, through cooling, curing, shaping, inspection, packaging and other processes to complete the production of pipes and fittings.
PVC-U pipe has the advantages of light weight, corrosion resistance, low water resistance, energy saving, quick installation and low cost.
UPVC: hard polyvinyl chloride silencer tube
High-rise building drainage, no ventilation pipe.
Nine, HDPE: high density polyethylene pipe
Drain pipe, underground cable pipe, ground source heat pump buried pipe.
HDPE is a high crystallinity, non-polar thermoplastic resin. The appearance of the original HDPE is milky white, a certain degree of translucency in thin section. In the water supply and drainage pipe system, plastic pipe has gradually replaced the traditional pipe such as cast iron pipe and galvanized steel pipe, and become the mainstream pipe. Compared with traditional pipe, plastic pipe has the significant advantages of light weight, corrosion resistance, low water resistance, energy saving, simple and rapid installation, low cost, and has been favored by the pipeline engineering field.
HDPE pipeline is mainly used in: municipal engineering water supply system, indoor water supply system of buildings, outdoor buried water supply system and residential district, factory buried water supply system, old pipeline restoration, water treatment engineering pipeline system, garden, irrigation and other fields of industrial water pipes.
Ten, PSP: core layer foam tube
The toroidal rigidity is eight times that of the normal UPVC. Used for drainage system.
Glass fiber reinforced polypropylene (FRPP) tube is made of glass fiber modified polypropylene raw material treated with coupling agent. The products have the characteristics of corrosion resistance, high strength, leakage resistance, small internal resistance, tensile strength, bending resistance, low cost, long life, easy installation and maintenance, etc., widely used in petroleum, chemical industry, electric power, textile, metallurgy, pharmaceutical, papermaking, food, mining, waste treatment, construction and other industries, used as corrosive liquid transportation and process pipeline, deeply trusted by users.
RPM: glass fiber reinforced plastic sand tube
The pipe is made of high-strength glass fiber reinforced plastic (FRP) as the inner and outer reinforcing layer, and the middle of the pipe is made of cheap quartz sand/resin as the core layer to improve the stiffness of the pipe, and then supplemented with a tough acid and alkali corrosion resistant lining layer and an outer protective layer to meet the requirements of the working environment to form a composite pipe wall structure. RPM tube can be produced by centrifugal casting or winding process. Therefore, there are two types of composite pipe, winding pipe, composite pipe and centrifugal casting pipe. When the centrifugal casting process is adopted, the glass fiber is cut fiber. When the winding process is adopted, the glass fiber is made of long fiber. The maximum diameter of centrifugally cast RPM tube is 2400mm, and the maximum diameter of fiber wound RPM tube is 4000mm. Thermosetting plastic pipe. Its characteristics are:
Good corrosion resistance;
Light weight high strength;
Easy to install;
The inner surface is smooth, with high circulation capacity;
Good low temperature resistance;
Good heat insulation.
13. ABS: acrylonitrile - butadiene - styrene engineering plastic water supply pipe
The material of pipe manufacturing is acrylonitrin-butadiene-styrene mixture, in which ABS resin is the main material. Only the additives needed to improve its physical and mechanical properties and processing properties are added. The additives should be dispersed evenly. The density of propylene wax butadiene styrene (kg/ m3) is: 1000≤ρ≤l070. The acrylonitrile in propylene wa-butadiene styrene raw material should be more than 20 (mass fraction), and the other components should not be more than 5% (mass fraction). The raw materials should be made into pipes and tested according to the provisions of GB/T18252. The minimum required strength MRS Is not less than 14MPa, and the minimum value of overall service (design) coefficient C is 1.6.
ABS pipe and fittings shall be manufactured in accordance with GB/T20207. Chlorinated polyvinyl chloride piping systems for the delivery of drinking water shall comply with the requirements of GB/T17219-1998.
According to the chemical resistance and hygiene of the material, it is suitable for pressure water supply and drainage transportation, sewage treatment and water treatment, petroleum, chemical industry, power electronics, metallurgy, mining, electroplating, papermaking, food and beverage, air conditioning, medicine and other industrial and construction fields of powder, liquid and gas and other fluid transportation.