Performance characteristics of HDPE water supply pipe

A good pipeline should not only have good economy, but also should have a series of advantages such as stable and reliable interface, material impact resistance, crack resistance, aging resistance, corrosion resistance, etc. Compared with the traditional pipe materials, HDPE piping system has the following series of advantages:
(1) Reliable connection: polyethylene piping system is connected by electro-thermal fusion, and the strength of the joint is higher than the strength of the pipe body.
(2) Good low-temperature impact resistance: the low-temperature embrittlement temperature of polyethylene is extremely low, and it can be used safely in the temperature range of -60-60℃. During winter construction, no pipe brittleness will occur due to the good impact resistance of the material.
(3) good stress cracking resistance: HDPE has low notch sensitivity, high shear strength and excellent scratch resistance, environmental stress cracking resistance is also very outstanding.
(4) Good chemical resistance: HDPE pipes are resistant to the corrosion of a variety of chemical media, and the chemicals present in the soil will not cause any degradation effect on the pipes. Polyethylene is an electrical insulator, so there will be no rot, rust or electrochemical corrosion phenomenon; in addition it will not promote the growth of algae, bacteria or fungi.
Nevertheless, there is a release of harmful substances when burned.
(5) Ageing resistance and long service life: polyethylene pipes containing 2-2.5% of uniformly distributed carbon black are able to be stored or used outdoors in the open air for 50 years without being damaged by ultraviolet radiation.
(6) Good abrasion resistance: the comparative test of the abrasion resistance of HDPE pipe and steel pipe shows that the abrasion resistance of HDPE pipe is 4 times of that of steel pipe. In the field of mud transportation, compared with steel pipe, HDPE pipe has better abrasion resistance, which means that HDPE pipe has longer service life and better economy.
(7) good flexibility: the flexibility of HDPE pipeline makes it easy to bend, the project can be changed by changing the direction of the pipeline to bypass obstacles, in many occasions, the flexibility of the pipeline can reduce the amount of pipe fittings and reduce the cost of installation.
(8) low resistance to water flow: HDPE pipeline has a smooth inner surface, its Manning's coefficient is 0.009. smooth performance and non-adhesion characteristics to ensure that the HDPE pipeline has a higher conveying capacity than the traditional pipe, but also reduces the pressure loss of the pipeline and the energy consumption of water transmission.
(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 needs, 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 techniques, in addition to the traditional excavation methods can be used for construction, but also a variety of new non-excavation techniques such as pipe jacking, directional drilling, pipe lining, cracking pipe, etc., which is the only choice for some places that do not allow excavation, so HDPE pipeline has a much wider range of applications.
1, softness: because PE-RT is soft. Therefore, construction does not require special tools, so the construction cost is relatively low. 2, thermal conductivity: for floor heating pipe needs to have good thermal conductivity, PE-RT thermal conductivity is better, its thermal conductivity for PP-R, PP-B pipe twice. Very suitable for floor heating. 3. 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's low-temperature impact resistance is better. Winter construction pipe is not easy to be ruptured by the impact, increasing the flexibility of construction arrangements. 5, environmental protection: PE-RT and PP-R can be recycled, do not pollute the environment. PEX can not be recycled will produce secondary pollution; 6, processing stability: PEX there is a control degree of crosslinking and crosslinking uniformity and other issues, processing complexity and processing directly affect the performance of the pipe. PE-RT, and PP-R processing is simple, pipe performance is basically determined by the raw material, the performance is more stable. PE-RT is Polyethylene Raised Temperature short, it is copolymerized by ethylene monomer and 1-octene monomer, is designed specifically for the heating system and medium density ethylene-octene Copolymer, with a narrow molecular weight distribution, octene uniformly distributed in the main chain of the polymer of the special molecular structure, which not only retains the original PE health performance and processing performance and other advantages, but also strengthened the durability of high temperature of a new type of pipe special materials. Pipes made from this raw material are mainly used in the field of hot water/heating pipes in buildings, and their durability is the same as the life of the building, at least up to 50 years, and also has good recyclability, with a very high added value.