High quality materials and advanced production technology are adopted for the steel mesh skeleton polyethylene composite pipe, which makes 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 transmission pipeline systems. The fittings used for the polyethylene composite pipe with steel mesh framework are polyethylene electrofusion fittings. During the connection, the outer plastic layer of the pipe and the inner plastic layer of the pipe are fused by the inner heating element of the pipe, and the pipe and the pipe are reliably connected together.
The elastic modulus of steel is usually about 200 times that of high-density polyethylene. The rigidity, impact resistance and dimensional stability of the steel mesh skeleton polyethylene composite pipe are superior to any pure plastic pipe due to the reinforcement of the steel mesh skeleton. At the same time, because the reticulated steel framework itself is a flexible structure, the composite pipe also has certain flexibility in the axial direction.
Therefore, the pipe has the characteristics of rigid and flexible combination, and has excellent adaptability in loading and unloading, transportation, installation and operation reliability. Installation on the ground can save the number of bearings, and the cost is low; Underground installation can effectively bear the sudden impact load caused by settlement, sliding, vehicles, etc. Small diameter pipes can be properly bent and arranged according to terrain fluctuation or serpentine layout to save pipe fittings.
The thermal expansion coefficient is small because the linear expansion coefficient of steel wire for plastic pipe is 10.6~12.2 × 10-6 (1/℃), linear expansion coefficient of pure plastic pipe is 170 × 10-6 (1/℃), the thermal expansion of the composite pipe is greatly improved under the constraint of the mesh steel skeleton, which is lower than any common plastic pipe. Through testing, the expansion coefficient of the steel mesh skeleton polyethylene composite pipe is 35.4~35.9 × 10-6 (1/℃), only 3~3.4 times of ordinary carbon steel pipe. The experimental results show that the thermal compensation device can not be used for buried installation.
