Steel reinforced thermoplastics composite pipe has the common characteristics of anti-corrosion, no scaling, smooth low resistance, heat preservation no wax, wear resistance, light weight and other plastic pipe, and its unique structure also creates the following characteristics:
(1) Good creep resistance and high lasting mechanical strength
Because plastics will creep at room temperature and under stress, and brittle fracture will occur under high lasting stress, 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 within the temperature range of plastics. When the mesh steel wire frame is combined with plastic, the creep of plastic can be restrained effectively and the lasting strength of plastic can be greatly improved. Therefore, the allowable stress of polyethylene composite pipe with wire mesh skeleton is twice as high as that of plastic pipe.
(2) Good temperature resistance
The strength of plastic tubing generally decreases with the increase of temperature within its use temperature range, and the strength of plastic tubing decreases by more than 10% with the increase of temperature by 10℃. Because the strength of wire mesh skeleton polyethylene composite pipe about 2/3 is borne by the wire mesh skeleton, so its strength with the increase of the use of temperature and lower than any kind of pure plastic pipe. The experimental results show that the strength of steel wire mesh skeleton polyethylene composite pipe decreases by less than 5% with increasing of 10℃.
(3) Rigidity, good impact resistance, good dimensional stability, and moderate flexibility, rigid and soft balance
The elastic modulus of steel is usually about 200 times that of high-density polyethylene. The rigidity, impact resistance and dimensional stability of polyethylene composite pipe with wire mesh skeleton are better than any other pure plastic pipe due to the strengthening effect of wire mesh skeleton. At the same time, because the mesh steel skeleton itself is a flexible structure, the composite pipe also has some flexibility in the axial direction. Therefore, the pipe has the characteristics of rigid and flexible combination, in the loading and unloading, transportation, installation adaptability and operation reliability are excellent. Ground installation can save the number of support, low cost; The underground installation can effectively withstand the sudden impact load caused by subsidence, slippage and vehicles. Small diameter pipe can be properly bent, with relief layout or snake layout, save pipe fittings.
(4) Small thermal expansion coefficient
Due to the plastic pipe wire expansion coefficient of 10.6 ~ 12.2×10-6 (1/℃), pure plastic pipe wire expansion coefficient of 170×10-6 (1/℃), wire mesh skeleton polyethylene composite pipe in the mesh steel skeleton constraints, the thermal expansion of composite pipe is greatly improved, lower than any kind of commonly used plastic pipe, through the test, The expansion coefficient of wire mesh skeleton polyethylene composite pipe is 35.4 ~ 35.9×10-6 (1/℃), which is only 3 ~ 3.4 times that of ordinary carbon steel pipe. The experimental results show that the heat compensation device is generally not needed for buried installation, and the pipe can be absorbed (or released) by meandering laying, thus reducing the installation cost.
(5) Rapid cracking will not occur
Pure plastic pipe, especially large diameter pure plastic pipe at low temperature under the action of persistent circumaxial stress, easy to produce rapid cracking caused by local defects, stress concentration (instantaneous hundreds of meters to kilometers above), so at present, the international rapid cracking resistance of plastic pipe put forward high requirements, and low carbon steel does not exist brittle fracture problem, The existence of steel mesh prevents the deformation and stress of plastics from reaching the critical point of rapid cracking. Therefore theoretically speaking, there is no rapid cracking of wire mesh frame polyethylene composite pipe.
6) The composite of steel and plastic materials is uniform and reliable
At present, the steel-plastic composite pipe on the market because the composite surface between steel and plastic is a continuous regular interface, long-term use under the action of alternating stress is easy to delamination, resulting in joint leakage, internal bottleneck shrinkage, blockage and failure. Compared with wire mesh skeleton polyethylene composite pipe is mesh structure through special hot melt adhesive (modified HDPE) so that plastic and wire mesh closely combined and integrated. The mutual binding force of the two materials is large and uniform, and the stress concentration is small.
7) Double-sided anticorrosion
The steel wire mesh skeleton is composite in the plastic through the special hot melt layer. The inner and outer surfaces of the pipe have the same anticorrosive performance, wear-resistant, smooth inner wall, small transmission resistance, no scaling, no wax, obvious energy-saving effect, which is more economical and convenient for buried transportation and corrosive environmental conditions.
(8) Good self-tracer
Because of the existence of wire mesh skeleton, the buried wire mesh skeleton polyethylene composite pipe can be located by the usual magnetic detection method, to avoid the damage caused by other excavation projects. And this kind of damage is pure plastic pipe and other non-metallic pipe to produce the most damage.
(9) Convenient and flexible adjustment of product structure and performance
The structure and performance of the product can be adjusted by changing the diameter of the wire, the spacing of the net, the thickness of the plastic layer, the plastic and the type, so as to meet the requirements of different pressure, temperature and corrosion resistance.
(10) Special electric fusion joint, variety, installation is very fast and reliable
The connection of steel wire mesh frame polyethylene composite pipe adopts electrothermic connection and flange connection. Electrothermic connection is to insert the composite pipe into the electrothermic pipe fitting, and electrify the electric heating wire embedded on the inner surface of the pipe fitting to heat it up. First, the inner surface of the pipe fitting is melted to produce melt, and the melt expands and fills the gap of the pipe fitting until the outer surface of the pipe also produces melt, and the two melts melt together with each other. After cooling and forming, the pipe and pipe fitting are closely connected as a whole.
Post time: Feb-28-2023
