Ultra-high molecular weight polyethylene pipes were listed as a key national promotion plan for scientific and technological achievements in the Ministry of Science and Technology’s Guokejizi (2000) No. 056 document in 2001. They are new materials and products in the chemical industry. The State Planning Commission and the Ministry of Science and Technology have listed ultra-high molecular weight polyethylene pipes as current priority projects in key areas of high-tech industrialization.
1. The impact resistance of super high pipe. Its resistance to environmental stress, cracking ability and scratch resistance ranks first among all types of plastics. Its impact strength is more than 10 times that of PE100 at room temperature and more than 16 times that of PE100 at -30°C. Its anti-cracking ability is twice that of PE100. Or so, and the lower the ambient temperature, the stronger the impact resistance. Its extraordinary flexibility allows it to withstand various external impacts and crustal deformations without the need for composite steel pipes, and is safer and more reliable than steel pipes.
2. The wear resistance of ultra-high pipe is 4 to 7 times that of steel, 10 times that of polyethylene and polypropylene, and 2.3 times that of PE. It is more effective in transporting small particle slurries such as fly ash. good.
3. Super tube is a saturated molecular group structure with very stable chemical properties and can withstand the erosion of various corrosive media and organic solvents. It is more durable than plastics such as polyethylene, polypropylene, nylon, and ABS. Corrosion resistant.
4. Ultra-high pipe is non-adhesive and its chemical and physical polarity is lower than that of ordinary plastics. For example, polyethylene has a polarity of 9, while ultra-high pipe has a polarity of only 1. Of course, it is lower than metal materials, so ordinary adhesives will not work for super heights. Likewise, scaling materials have difficulty adhering. As long as the slurry flow rate reaches 2.3 to 4.6 meters/second, scaling will be difficult to form. Even if the scale slowly accumulates over a long period of time, it is not firm and easy to remove. Moreover, there is no need to add corrosion inhibitors for pickling. After pickling, the surface is as smooth as before and the pipe wall is not damaged.
5. The theoretical service life of ultra-high pipes can reach hundreds of years. The ultra-high aging speed and embrittlement speed are very slow. After 50 years of buried use, their mechanical properties will only drop by about 20%. The anti-aging performance of high-pipe pipes is better than that of PE100, and the anti-aging performance of polyethylene pipes is about 1/4 higher than that of PE100 pipes. The anti-ultraviolet performance is the same as that of PE100, and 2.5% carbon black is added in accordance with national regulations. For fatigue strength, please refer to the "No. 3 Institute Test Report". The fatigue strength is about 16 times higher than that of PE100.
6. The friction coefficient of super pipe is only 1/6 of new steel pipe, 1/5 of ordinary polyethylene, 1/20 of rubber, and 1/2 of polypropylene. The flow coefficient "C" for ultra-high pipes is 160. The new steel pipe is only 130, while the old steel pipe drops to 95. For harsh working conditions such as mortar transportation, the "C" index of the steel pipe is only 60 to 80. Moreover, the ultra-high wear resistance, non-stickiness and corrosion resistance can keep the pipe wall smooth and smooth, and the circulation capacity is generally more than 50% higher than that of steel pipes, allowing the transmission system to maintain a low-pressure and smooth state for a long time.
7. The tensile yield strength and tensile rupture strength of ultra-high pipes are high, the thermal deformation temperature is more than ten degrees higher than that of ordinary plastics, and the cold brittle temperature has almost no lower limit, coupled with an elongation of 100% , therefore, it can withstand greater pipe stress in a larger temperature range and absorb impact loads and water pressure fluctuations that occur during shutdowns.
8. The welding process of ultra-high pipe is simple, intuitive and efficient. The strength of the weld exceeds that of the pipe body, which provides convenience and guarantee for the installation of long-distance pipelines, especially medium and high-pressure pipelines. Ultra-high pipes do not require anti-corrosion. The pipes are light and soft, easy to transport and lay, and allow the direction to be changed according to terrain changes.
The installation cost of super pipes is generally only about one-fifth of that of steel pipes and steel-plastic composite pipes.
9. The price of super tube is relatively moderate. The total project cost of medium-diameter, medium- and low-pressure pipelines is even lower than seamless steel pipes, and even lower than composite pipes and alloy pipes. However, the service life is more than 6 times higher than steel pipes and more than 4 times higher than composite pipes. The economic benefits are very significant.
10. Ultra-high pipes are suitable for crude oil gathering and transportation pipelines. Since most crude oil gathering and transportation pipelines are laid in remote areas with complex landforms, severe climate change and other unfavorable conditions, the advantages of ultra-high pipes are: It is light in weight, easy to install and construct, has strong low temperature resistance and is anti-aging, so its advantages are more prominent in the laying of crude oil gathering and transportation pipelines. (It is not suitable to be used above 35℃)
Through analysis and comparison, we can see that ultra-high molecular weight polyethylene pipe is indeed an industrial transmission system more suitable for enterprise use, and all performance indicators are very good. Ideal, with obvious advantages, safe, reliable, economical and practical, ultra-high molecular weight polyethylene pipe performance is higher than PE100, and it is the fourth generation of plastic pressure pipes.
Shandong Jinda Pipe Industry Co., Ltd.