Excellent physical properties. The performance of medium density polyethylene is between high and low density polyethylene. It not only maintains the rigidity and strength of high density polyethylene, but also has good flexibility and creep resistance, and high density polyethylene is more hot. The characteristics of excellent fusion connection performance are conducive to the installation of plastic pipes.
Corrosion resistance and long service life. In the coastal areas of our country, the groundwater level is high and the soil humidity is high. The use of seamless steel pipes must be anti-corrosion and externally tempered for installation, and the service life is only 30 years, while PE pipes can withstand a variety of chemical media. corrosion, without anti-corrosion treatment. Also, it does not promote algal, bacterial or fungal growth and has a lifespan of 50 years.
Good toughness and flexibility. PE pipe is a kind of high-toughness pipe, its elongation at break exceeds 500%, it has strong adaptability to the uneven settlement and dislocation of the pipe foundation, and has good seismic resistance. It is confirmed that the PE pipe is the pipe with the best shock resistance. There is a saying that in the Kobe earthquake in Japan in 1995, PE pipes and water supply pipes were the only pipes that were not damaged. In addition, the flexibility of the PE pipe is that the PE pipe can be coiled, reducing a large number of connecting pipe fittings. The direction of the PE pipe can be easily changed according to the requirements of the construction method. During construction, obstacles can be bypassed within the allowed bending radius of the pipe to reduce the difficulty of construction.
The circulation capacity is large and the economy is cost-effective. The inner wall of the PE pipe is smooth and does not scale. The equivalent absolute roughness ratio of the inner surface of the PE pipe is 1/20 of that of the steel pipe. The flow capacity of the PE pipe with the same pipe diameter, the same length and the same pressure is about 30% larger than that of the steel pipe, so the economic advantage is obvious. Compared with metal pipes, PE pipes can reduce the project investment by about one third, and the small diameter pipes that can be coiled can further reduce the project cost. , The connection is convenient, the construction is simple, and the methods are various. The PE pipe body is light, easy to handle, easy to weld, and has few welding joints. When the pipeline is long, the coil pipe can be used to lay the PE pipe trench. The requirements are far lower than the steel pipe trench, and when the construction conditions are limited, electrofusion welding can be used . In addition, the method of submerging the pipe can be used to lay on the bottom of the water, which greatly reduces the construction difficulty and engineering cost.
Good sealing. The PE pipe itself is welded and connected, which essentially ensures the identity of the interface material, structure and the pipe body itself, and realizes the integration of the joint and the pipe. The tensile strength and bursting strength of the interface are higher than those of the pipe body, which can effectively resist the hoop stress and axial stress generated by the internal pressure. Therefore, compared with rubber ring type joints or other mechanical joints, there is no leakage risk caused by joint distortion, and the sealing performance is very good.
It is easy to maintain and can be repaired and installed without water and gas.
Good stress cracking resistance: PE pipe has low notch sensitivity, high shear strength and segmental anti-scratch ability, and outstanding environmental stress resistance. Good low temperature impact resistance: The low temperature embrittlement temperature of PE pipe is extremely low, and it can be used safely in the temperature range of -60 degrees Celsius. In the northern part of my country, when the polyethylene buried water supply is laid in the field in winter, it is concluded that it is not suitable for laying construction under zero degrees, because the polyethylene pipe is easily brittle. Good abrasion resistance. The wear resistance comparison experiment of polyethylene pipe and steel pipe shows that its wear resistance is 4 times that of steel pipe.
Post time: Aug-14-2022
