Comparison of PE pipe and steel pipe

 　　1. Lightweight, convenient transportation, and low construction cost: The seamless steel pipe has high construction strength and often requires auxiliary construction tools such as cranes. The density of PE water supply pipes is less than 1/8 of that of steel pipes (PE water supply pipes have a density of 0.935g/㎝3, steel pipes). It is 7.88 g/㎝3), the 315-size pipe weighs only 9.29kg, the construction intensity is low, the progress is fast, and the construction cost can be reduced by 30%-50% compared with traditional pipes; and with the shortage of steel in the market, its The price will continue to rise, so it's cost performance is self-evident compared with PE water supply pipes.

　　2. Corrosion resistance: The outer side of the steel pipe needs to be brushed with oil to prevent corrosion, which increases the project cost; the inner side of the steel pipe is susceptible to electrochemical corrosion and microbial corrosion and must be anti-corrosive. After long-term use, the zinc layer is easily damaged, and the corrosion of steel pipes also causes secondary pollution of water quality. The "black water" and "red water" in some residential areas are caused by the long-term corrosion of pipes. Residents’ safe drinking water brings great harm and the PE water pipe has good chemical stability, good corrosion resistance, no anti-corrosion treatment, no chemical reaction with other elements in the water, and safe transportation of drinking water.

　　3. Convenient connection and easy installation.

　　4. Long service life: the steel pipe must be anti-corrosive, and the service life is only about 30 years, while the PE pipe can withstand the erosion of a variety of chemical media, does not need anti-corrosion treatment, and has a service life of up to 50 years under normal use conditions, which is in line with our current regulations The longevity of the building is synchronized.

　　5. The inner wall is smooth, the water delivery is large, and the operational energy consumption is small: the roughness n value of the PE pipe is only 0.008. The roughness rate of new steel pipes is 0.025, and after 20 years of operation, the roughness value will increase by 5-10 times. Polyethylene pipes are non-corrosive and their roughness does not change with time. Under the same pipe diameter and the same water delivery pressure, The resistance loss along the way can be reduced by 30%, and the water delivery capacity can be much higher than that of steel pipes, and the water delivery capacity can be kept unchanged for 50 years, which is 20% higher than that of steel pipes.

　　6. Convenient maintenance and low maintenance costs: PE pipes are easy to repair, can be repaired and installed without stopping water and air, and do not require expensive costs and complicated tools. According to actual engineering experience, the maintenance cost of PE pipes is only 30% of that of steel pipes.

　　7. Good wear resistance: the wear resistance of the PE water supply pipe is more than 4 times that of the cast pipe.

　　8. Good weather resistance: The low-temperature embrittlement temperature of polyethylene is extremely low, and it can be used safely in the temperature range of -20～40℃. During construction in winter, due to the good impact resistance of the material, the pipe will not be brittle.

　　9. Good toughness and flexibility: cast iron pipe construction requires a high pipeline foundation and low adaptability; while PE pipe is a kind of high toughness pipe, its elongation at break exceeds 500%, and its adaptability to uneven settlement and dislocation of the foundation It is very strong and has good shock resistance. Therefore, it is suitable for use in dangerous areas. Practices around the world have confirmed that PE pipes are the most shock-resistant pipes. In addition, the flexibility of the PE pipe allows the PE pipe to be coiled, especially the pipe with a small diameter, which reduces the large number of connecting pipes. During construction, obstacles can be bypassed within the allowable bending radius of the pipe to reduce the difficulty of construction.

　　10. Good airtightness: The PE pipe itself adopts a hot melt connection, 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 blasting strength of the interface are higher than that of the pipe body, which can effectively resist the hoop stress and axial stress generated by the internal pressure, and will not cause water leakage due to the pressure bearing capacity of the interface. The steel pipe is an apron socket Compared with the type connection or other mechanical joint connection, there is no risk of leakage caused by the distortion of the joint, and the sealing performance is very good.

　　http://www.xysteelpipe.com/info/Comparison-of-PE-pipe-and-steel-pipe-1928-1.htm

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