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PE pipe PVC pipe PP pipe PB pipe how to distinguish
Compared with the characteristics and main uses of several plastic pipes, PVC pipes have better tensile and compressive strength, but their flexibility is not as good as other plastic pipes, their corrosion resistance is excellent, and their price is the cheapest among all kinds of plastic pipes. However, CPVC pipes have outstanding heat resistance at low temperature, such as brittle bonding, socket rubber ring connection, flange thread connection, water supply and drainage, irrigation, gas supply and exhaust pipes, wire pipes, rainwater pipes, industrial anti-corrosion pipes, etc, the thermal deformation temperature is 100 ℃, excellent chemical resistance, bonding, flange threaded connection hot water pipe, PE pipe, light weight, good toughness, good low temperature resistance, non-toxic, and cheaper,
Comparison of the characteristics and main uses of several plastic pipes
PVC pipe has good tensile and compressive strength, but its flexibility is not as good as other plastic pipes, has excellent corrosion resistance, and the price is the cheapest among all kinds of plastic pipes, but it is brittle bonding at low temperature, socket rubber ring connection, Flange threaded connection is used for water supply and drainage, irrigation, gas supply, exhaust pipes, wire conduits, rainwater pipes, industrial anti-corrosion pipes, etc. in residential life, industry and mining, agriculture.
CPVC pipe has outstanding heat resistance, thermal deformation temperature of 100 ℃, excellent chemical resistance, bonding, flange threaded connection of hot water pipe
PE pipe has light weight, good toughness, good low temperature resistance, non-toxic, cheaper price, high impact strength, but low compression and tensile strength, hot melt welding, flange threaded connection drinking water pipe, rainwater pipe, gas pipe, industrial corrosion-resistant pipe
PP pipe corrosion resistance is good, has good strength, high surface hardness, surface finish, has a certain high temperature resistance hot melt welding, flange thread connection chemical sewage, sea water, oil and irrigation pipeline, used for indoor concrete floor heating system heating pipe
ABS tube has excellent corrosion resistance, lighter weight, higher heat resistance than PE and PVC, but the price is more expensive. Bonding, flanged and threaded connection of sanitary ware sewer pipes, pipes, sewage pipes, underground cable pipes, high anti-corrosion industrial pipes, etc.
The strength of PB pipe is intermediate between PE and PP, and its flexibility is intermediate between LDPE and HDPE. Its outstanding characteristics are creep resistance (cold deformation), repeated winding and continuous, temperature resistance and good chemical performance. Hot melt welding, flange threaded connection of water supply pipe, cold and hot water pipe, gas pipe and underground buried high pipe
GRP pipe has excellent corrosion resistance, light weight, high strength, and good designability. Socket rubber ring connection and flange connection are widely used in petrochemical pipes and large-diameter water supply and drainage pipes
PE and PP-R, the use of hot melt or electric fusion connection, complex process, easy to produce stacking defect area, resulting in stress concentration, affecting the long-term performance of the pipeline.
From the perspective of long-term health performance, the middle aluminum layer of aluminum-plastic pipe is isolated from oxygen, which is not easy to cause the breeding of microorganisms and algae. Generally, the outer PE is allowed to add antioxidants, which will not cause inner water pollution, PE pipe and PP-R pipe. The tube can not block oxygen, easily lead to microbial and algal reproduction, affect the health of drinking water; and contains a large number of antioxidants, easy to cause water pollution.
Judging from the high temperature resistance, the long-term service temperature specified in the national standard of aluminum-plastic pipe is 95cC, and the maximum service temperature is 110cC, which can fully meet the needs of domestic water. PE pipe's performance decreases rapidly with the increase of temperature and is limited to cold water transportation. PP-R to the long-term service temperature specified in the national standard of 70cC and the maximum service temperature of 95 ℃, there are certain limitations in the use of hot water pipes.
Judging from the aging resistance, the molecular structure of the aluminum-plastic pipe is stable, the inner and outer layers are separated by PE, and the outer layer is allowed to add enough anti-light and anti-oxygen stabilizers without affecting the hygiene of the inner layer contacting water. The molecular structure of PE pipe is stable, but the single-layer structure is not conducive to adding stabilizer, which is easy to cause secondary pollution of water in the pipe. PP-R pipe contains a large number of unstable tertiary carbon atoms, which are susceptible to light, oxygen and impurities.
A good pipeline should not only have good economy, but also have a series of advantages such as stable and reliable interface, impact resistance, cracking resistance, aging resistance, corrosion resistance, etc. Compared with traditional pipes, HDPE pipeline system has the following A series of advantages:
(1) Reliable connection: the polyethylene pipe system is connected by electric melting, and the strength of the joint is higher than that of the pipe body.
(2) Good low-temperature impact resistance: Polyethylene has extremely low low-temperature embrittlement temperature and can be used safely in the temperature range of -60-60 ℃. During winter construction, due to the good impact resistance of the material, the pipe will not crack.
(3) Good stress cracking resistance: HDPE has low notch sensitivity, high shear strength and excellent scratch resistance, and its environmental stress cracking resistance is also very prominent.
(4) Good chemical corrosion resistance: HDPE pipe can resist the corrosion of a variety of chemical media, the chemical substances in the soil will not cause any degradation of the pipeline. Polyethylene is an electrical insulator, so it does not decay, rust or electrochemical corrosion; in addition, it does not promote algae, bacteria or fungi growth.
(5) aging resistance, long service life: polyethylene pipes containing 2-2.5% evenly distributed carbon black can be stored or used outdoors for 50 years without being damaged by ultraviolet radiation.
(6) Good wear resistance: The wear resistance of HDPE pipes and steel pipes shows that the wear resistance of HDPE pipes is 4 times that of steel pipes. In the field of mud transportation, HDPE pipes have better wear resistance than steel pipes, which means that HDPE pipes have longer service life and better economy.
Good flexibility: the flexibility of HDPE pipe makes it easy to bend, and the project can bypass obstacles by changing the direction of the pipe. In many occasions, the flexibility of the pipe can reduce the amount of pipe fittings and reduce the installation cost.
(8) Small water flow resistance: HDPE pipe has a smooth inner surface, and its Manning coefficient is 0.009. Smooth performance and non-adhesive properties ensure that HDPE pipes have a higher conveying capacity than traditional pipes, while also reducing the pressure loss of the pipeline and water delivery energy consumption.
9 convenient handling: HDPE pipe is lighter than concrete pipe, galvanized pipe and steel pipe, it is easy to handle and install, lower manpower and equipment requirements, which means that the installation cost of the project is greatly reduced.
10, a variety of new construction methods: HDPE pipeline has a variety of construction technologies, in addition to the traditional excavation method for construction, can also use a variety of new trenchless technology such as pipe jacking, directional drilling, lining pipe, pipe cracking and other methods for construction, which is the only choice for some places that do not allow excavation, so HDPE pipeline application field is more extensive.
1, softness: because the PE-RT is more soft. Therefore, no special tools are needed during construction, so the construction cost is relatively low. 2. Thermal conductivity: The pipes used for floor heating need to have good thermal conductivity. The thermal conductivity of the PE-RT is better, and its thermal conductivity is twice that of the PP-R and PP-B pipes. Very suitable for underfloor heating use. High temperature resistance: PE-RT high temperature resistance can reach 90 ℃, while PEX can only reach 65 ℃. 4, low temperature thermal shock resistance: PE--RT low temperature impact resistance is better. During winter construction, the pipe is not susceptible to impact and rupture, which increases the flexibility of construction arrangements. Environmental protection: PE-RT and PP-R can be recycled without polluting the environment. And PEX can not be recycled will produce secondary pollution; 6, processing performance stability: PEX exists to control the degree of cross-linking and cross-linking uniformity and other issues, processing complex and processing directly affect the performance of the pipe. The PE-RT, and PP-R processing is simple, the pipe performance is basically determined by the raw material, the performance is relatively stable. PE-RT is the abbreviation of Polyethylene Raised Temperature. It is a medium density ethylene-octene copolymer specially designed for heating system. It has a special molecular structure with narrow molecular weight distribution and octene evenly distributed on the polymer main chain. It not only retains the original advantages of PE in sanitary performance and processing performance, but also strengthens the durability of high temperature pipes. The pipes produced with this raw material are mainly used in the field of hot water/heating pipes in buildings, and their durability is the same as that of buildings, with a minimum of 50 years. At the same time, they also have good recyclability and high added value.