February 20, 2023
As a new type of composite pipe, the steel mesh skeleton polyethylene composite pipe is reinforced by a network skeleton formed by helically winding high-strength steel wire left and right, with high-density polyethylene (HDPE) as the matrix, and high-performance HDPE modified A new type of pipe that tightly connects the steel wire skeleton and the inner and outer layers of high-density polyethylene with a permanent adhesive resin. Because the high-strength steel wire reinforcement is wrapped in continuous thermoplastic, the steel mesh skeleton polyethylene composite pipe overcomes the respective shortcomings of steel pipes and plastic pipes, while maintaining the respective advantages of steel pipes and plastic pipes.
The steel mesh skeleton polyethylene composite pipe adopts high-quality materials and advanced production technology to make it have higher pressure resistance. At the same time, the composite pipe has excellent flexibility and is suitable for long-distance buried water supply and gas pipeline systems. The pipe fittings used in the steel mesh skeleton polyethylene composite pipe are polyethylene electrofusion pipe fittings. When connecting, use the internal heating element of the pipe fitting to melt the outer layer plastic of the pipe material and the inner layer plastic of the pipe fitting, so as to reliably connect the pipe material and the pipe fitting together. Under the premise of ensuring excellent performance, the transportation and installation are as simple and fast as possible.
Specific product features of steel mesh skeleton polyethylene composite pipe:
1 "Good creep resistance, high durable mechanical strength"
Since plastics will creep under normal temperature and stress, and brittle fracture will occur under high persistent stress, so the allowable stress and bearing capacity of pure plastic pipes are very low (generally within 1.0Mpa). The mechanical strength of steel is about 10 times that of thermoplastics, and it is very stable and does not creep in the temperature range of plastics. After the mesh steel skeleton is combined with plastics, the steel skeleton can effectively restrain the creep of plastics. Change, so that the durable strength of the plastic itself is greatly improved. Therefore, the allowable stress of the steel skeleton plastic composite pipe is double that of the plastic pipe.
2 "Good temperature resistance"
The strength of plastic pipes generally decreases with the increase of temperature within the temperature range of use, and the strength of plastic pipes decreases by more than 10% for every 10C increase in temperature. Since about 2/3 of the strength of the steel skeleton plastic composite pipe is borne by the steel skeleton, its strength decreases less than any pure plastic pipe with the increase of the use temperature. The test results show that for every 10C increase, the strength of the steel frame plastic composite pipe decreases below 5%.
3 "Rigidity, impact resistance and moderate flexibility"
The elastic modulus of rigid and flexible steel is usually about 200 times that of high-density polyethylene. Due to the reinforcement of the steel skeleton, the rigidity, impact resistance and dimensional stability of the steel skeleton plastic composite pipe are better than any - a pure plastic tubing. At the same time, because the mesh steel skeleton itself is a structure, the composite pipe also has a certain flexibility in the axial direction. Therefore, the pipe has the characteristics of combination of rigidity and flexibility, and is very good in the adaptability of loading and unloading, transportation, installation and operation reliability. Ground installation can save the number of supports and low cost: underground installation can effectively cope with sudden impact loads caused by settlement, slippage, vehicles, etc. Small-diameter pipes can be properly bent and arranged according to the ups and downs of the terrain, saving pipe fittings.
4 "Small thermal expansion coefficient"
Since plastics will creep under normal temperature and stress, and brittle fracture will occur under high persistent stress, so the allowable stress and bearing capacity of pure plastic pipes are very low (generally within 1.0Mpa). The mechanical strength of steel is about 10 times that of thermoplastics, and it is very stable and does not creep in the temperature range of plastics. After the mesh steel skeleton is combined with plastics, the steel skeleton can effectively restrain the creep of plastics. Change, so that the durable strength of the plastic itself is greatly improved. Therefore, the allowable stress of the steel skeleton plastic composite pipe is double that of the plastic pipe.
5 "Rapid cracking will not occur"
Pure plastic pipes, especially large-diameter pure plastic pipes, are prone to rapid cracking (hundreds of meters or even kilometers in a split second) caused by local defects and stress concentration under the action of persistent hoop stress at low temperatures. The anti-rapid cracking performance puts forward very high requirements, and the low-carbon steel does not have the problem of brittle new cracks, and the existence of the steel mesh prevents the deformation and stress of the plastic from reaching the critical point of causing rapid cracking. Therefore, in theory, there is no rapid cracking of the steel skeleton plastic composite pipe.
Steel mesh skeleton polyethylene composite pipe also has double-sided anti-corrosion ability facing the environment inside the pipe and the environment outside the pipe at the same time, ensuring the same anti-corrosion performance inside and outside the pipe, wear-resistant, smooth inner wall, small conveying resistance, no scaling, no wax deposition , the energy-saving effect is obvious, and it is very economical and convenient to use under geographical and corrosive environmental conditions. Moreover, the two materials in the tube are uniformly and reliably compounded, and the force is uniform under mutual restraint, and it is not easy to delaminate and cause leakage at the joint.
