The connection operation of the trench coated plastic steel pipe is very simple, does not require special technology, and the general worker can operate after simple training. The reason is that these products dissolve the high-tech part of the product in a factory way. A pipe connection takes only a few minutes, simplifies the technical difficulty and field operation, saves time, stabilizes the project quality and improves the work efficiency. It is also the general direction of the development of installation technology. However, the traditional welding pipe connection and flange connection methods not only require welding workers with corresponding skills, but also time-consuming, difficult to operate, and welding smoke pollution. The differences in welding process and operation space make it difficult to obtain satisfactory results in welding quality and appearance, and affect the overall quality of the project.

In addition, because the trench pipe fittings are molded parts, the required operation space is small, and the installation by the corner can be realized, which greatly reduces the difficulty of operation, thus saving the floor area and beautifying the pipeline installation.

The two-slot plastic-coated composite steel pipe is trustworthy, and the plastic-coated steel pipe solves the shortcomings of the previous production and installation of the steel-plastic composite pipe, and has been praised and recognized by the majority of users. Technical standards: coating adhesion: polyethylene coating layer bonding force ≥30N/cm, epoxy resin coating 1~3 grade. Bending resistance: The nominal diameter of the steel-plastic pipe is not greater than 50mm, and there is no crack after bending, and there is no delamination between the steel and the internal and external plastic layer. Flattening performance: The nominal diameter of the steel-plastic pipe is greater than 50mm and not more than 600mm, and there will be no cracks after flattening, and there will be no delamination between the internal and external plastic layers. Health requirements: Transport of drinking water, hot and cold water steel tube layer plastic inner layer to meet GB/T17219 provisions.

Coated plastic steel pipe base pipe, the outer wall is coated with high adhesion, impact resistance, corrosion resistance, corrosion resistance, corrosion resistance, corrosion resistance, corrosion resistance, food grade sanitary thermoplastic powder coating. The inner and outer coated plastic composite steel pipe is upgraded from the traditional steel-plastic pipe and galvanized pipe, and has a high cost performance. It is suitable for sandblasting chemical dual pre-treatment, preheating, inner coating, outer coating, curing, post-treatment and other processes.