Ultra-polymer pipeline

Ultra-high molecular weight tube

Ultra High Molecular Weight Polyethylene

This is the best polyethylene available for harsh working environments and multiple uses. It works very well in many difficult applications. The unique feature of this polymer is its ultra-high molecular weight, which has a molecular weight of 3 to 6 million, while high-density polyethylene resins only have 300,000 to 500,000 . This difference ensures that the ultra-high molecular weight polyethylene has sufficient strength to achieve wear and impact resistance that other lower polymer products cannot have.

Characteristics of ultra-high molecular weight polyethylene pipes

(1) Low resistance coefficient, small friction resistance and high conveying efficiency.

The inner wall of the ultra-high molecular weight polyethylene wear-resistant pipe is very smooth, with very low roughness and friction. The roughness coefficient is 0.0084 , while the n value of the concrete pipe is 0.014 and the cast iron pipe is 0.013 . Therefore, the ultra-high molecular weight polyethylene wear-resistant pipe can significantly reduce the fluid pressure loss along the way, improve the transmission efficiency, and bring significant economic benefits:

① When the transportation indicators are the same, ultra-high molecular weight polyethylene pipes with smaller inner diameters can be used to reduce one-time engineering investment;

②Using pipes with the same inner diameter, ultra-high molecular weight polyethylene pipes can reduce pressure head loss compared to pipes made of other materials, saving electricity costs for delivery pumps;

(2) Good corrosion resistance.

Ultra-high molecular weight polyethylene pipes are resistant to erosion by acids, alkalis, salts, seawater, sewage, corrosive soil, groundwater and many chemical fluids. It has a longer service life than traditional pipes, and its design service life is generally more than 50 years. It has the advantages of no secondary pollution, no need for anti-corrosion, greatly extended service life, and easy installation. Therefore, it is welcomed by the water supply and drainage industry.

(3) Non-toxic and odorless, highly environmentally friendly.

Polyethylene is an environmentally friendly material certified by the state. It is non-toxic and anti-fouling and anti-moth. Because of its smooth surface, it will not be attached by microorganisms such as shellfish and fungi in the ocean or sewage, will not produce scale and microbial growth, will not increase the roughness, and ensure the stability of water quality. It   reduces the water-passing section and increases maintenance costs. It maintains the stability of water resistance. Traditional pipes still have the phenomenon of increased water resistance and surface scaling in the future.

(4) Good heat resistance and frost resistance.

 At -70 ℃ , it still has good toughness and extremely high strength and can be used for a long time in the range of -70 ℃ to 80℃ .

( 5 ) The ring stiffness and tensile strength are high, and the elongation is ≥350% .

Ultra-high molecular weight polyethylene pipes have hoop tensile strength and axial tensile strength of 32-42MPa , and hoop stiffness of less than 3 % . They are particularly suitable for environments where the terrain is prone to subsidence and it is difficult to build pipeline foundations. Pipes with different pressure levels and stiffness levels can be designed and manufactured according to different water supply flow rates, different pressures, different burial depths and load conditions.

( 6 ) Quick installation and short construction period.

The specific gravity of ultra – high molecular weight polyethylene pipe is between 0.935-0.94 , which is only 1/8 of steel , 1/2 of glass fiber reinforced plastic pipe , 1/8 of cast iron pipe , and about 1/4 of prestressed reinforced concrete pipe . Therefore, for the same diameter of the single weight, it is very convenient to transport and install. Each section of ultra-high molecular weight polyethylene pipe is 14 meters long , which can reduce two-thirds of the joints compared with steel-cased concrete pipe. Its socket-and-spigot electric hot-melt connection method is quick and easy to install, while reducing the cost of hoisting and increasing the speed of installation.

( 7 ) No pipe network leakage.

Leakage in water supply and drainage pipe networks has always been a problem that plagues urban water supply and drainage in my country. In 1999 , the average leakage rate of China’s urban water supply enterprises was 15.14% , and the leakage volume per unit pipe length was 3.41m3/km/h . The leakage of the pipe network was quite serious. The root cause of the problem is the leakage of the selected pipe itself and the leakage of the pipe connection, especially the leakage of the connection, which causes the foundation to sink and the pipe connection to crack. Ultra-high molecular weight polyethylene pipes completely solve the problem of pipe network leakage. Electric hot melt connection makes the pipe network leak-free.

( 8 ) Good electrical and thermal insulation. Ultra-high molecular weight polyethylene pipes are non –   conductors. The electrical insulation of the pipes is excellent. The insulation resistance is 1012-1015 MΩ . They are used in dense areas of power transmission and telecommunications lines and areas with many mines. The heat transfer coefficient of ultra-high molecular weight polyethylene pipes is very small. , only 0.13 , which is 2‰ of steel , and the pipe has excellent thermal insulation performance.

( 9 ) Good wear resistance.

It has been proven by many customers and laboratory tests of Tianjin Waterway Administration that the wear resistance of the ultra-high molecular weight polyethylene pipe produced by our company is 3.8 times higher than that of Q235 steel and 2 times higher than that of silicon manganese 13 wear-resistant steel .

( 10 ) Low construction cost.

① The construction working surface is small. Compared with prestressed steel-cased concrete pipes, cast iron pipes, and glass fiber reinforced plastic pipes of the same diameter, the working surface is two-thirds less, which can reduce the land occupation compensation fee by 70% . Taking the pipe with an inner diameter of 800mm as an example, the working surface of prestressed steel-cased concrete pipes, cast iron pipes, and glass fiber reinforced plastic pipes requires a width of 25 meters, while the construction surface of ultra-high molecular weight polyethylene pipes only needs to be 8 meters wide. This greatly reduces the land occupation compensation fee.

② The laying of ultra-high molecular weight polyethylene pipes does not require a 3 : 7 lime soil foundation and does not require sand filling. It is only necessary to connect the pipes at the trench edge and push them into the filling soil for compaction. The laying of prestressed steel-jacketed concrete pipes, cast iron pipes, and fiberglass reinforced plastic pipes requires a 3 : 7 lime-soil foundation or a brick-concrete foundation, which needs to be filled with sand.

③ Compared with steel pipes and cast iron pipes, ultra-high molecular weight polyethylene pipes do not need anti-rust and anti-corrosion treatment when laying, and there is no need for cathodic protection for underground pipes, which can save more than 70 % of engineering costs.

( 11 ) Low maintenance cost.

 Due to the corrosion resistance, wear resistance, frost resistance and anti-fouling properties of ultra-high molecular weight polyethylene pipelines, there is no leakage, so the pipelines do not need to carry out anti-rust, anti-fouling, insulation, heat preservation and other measures and maintenance for decades after operation. It can save more than 95 % of operation and maintenance costs.

( 12 ) The pipe network has a long service life.

According to laboratory simulation tests, the service life of ultra-high molecular weight polyethylene pipes can be more than 100 years.

( 13 ) Good long-term comprehensive benefits and low operating costs.

Comprehensive benefits refer to the long-term benefits formed by various factors such as construction investment, installation costs, operation and maintenance costs, service life, energy saving, etc. The comprehensive benefits of ultra-high molecular weight polyethylene pipes are desirable. In particular, the larger the pipe diameter, the lower the cost. The pipe buried underground can be used for 150 years and does not need to be inspected and maintained every year, which can give full play to its superior comprehensive benefits.

Application areas of ultra-high molecular weight polyethylene pipes:

Metallurgy: transportation of slurry and metallurgical waste residue.

Thermoelectric: Conveying of mortar (violet ash).

Petroleum: Transportation of crude oil and wastewater.

Coal mining: transportation of raw ore, tailings, concentrate and other slurries; washing of solid-liquid mixtures in mineral processing plants and coal preparation plants; filling of mines; transportation of coal slurry.

Dredging industry: transportation of silt in ports, rivers and lakes.

Salt industry and salt chemical industry: salt water, salt lake dredging, and brine transportation.

Construction: Mud mixing pump truck.

Municipal administration: sewage sludge, urban rivers, lakes, silt removal, construction site dredging and drainage.

Grain: conveying of highly abrasive particles such as wheat, flour, rice, grains, soybeans, corn, etc.

Building materials: transportation of sand, cement, lime, refractory materials, burned ore, bauxite, gypsum and concrete