Introduction to Coated Composite Pipes
Release time:
2020-11-01
Plastic-coated composite pipes are a new type of pipe developed in China. Both the inner and outer surfaces are coated with plastic. The composite structure, which combines welded steel pipes or seamless pressure-resistant steel pipes, overcomes the drawbacks of steel pipes, such as their susceptibility to rusting, significant pollution, and tendency to deform. Plastic-coated composite pipes integrate the advantages of both steel pipes and plastic products, making them nationally recognized as environmentally friendly products. These pipes are steel-plastic composites composed of polyethylene resin, ethylene-acrylic copolymer, epoxy resin powder, non-toxic polypropylene, or non-toxic polyvinyl chloride, with a coating thickness ranging from 0.5 to 1.0 mm.
Plastic-coated composite pipes are a new type of pipe developed in China. Both the inner and outer surfaces are coated with plastic. The composite structure, which combines welded steel pipes or seamless pressure-resistant steel pipes, overcomes the drawbacks of steel pipes, such as their susceptibility to rusting, significant pollution, and tendency to deform. Plastic-coated composite pipes integrate the advantages of both steel pipes and plastic products, making them nationally recognized as environmentally friendly products. Plastic-coated composite pipes are made from polyethylene resin, ethylene... - The steel-plastic composite pipe, composed of acrylic copolymer, epoxy resin powder, non-toxic polypropylene, or non-toxic polyvinyl chloride, has a thickness of: 0.5–1.0 mm 。
Plastic-coated composite pipes not only boast advantages such as high strength and resistance to water hammer, but also overcome the drawbacks of steel pipes—such as susceptibility to water corrosion—and those of plastic pipes—such as low strength and poor fire resistance. Their designed service life can reach... 50 Year. The main drawback is that bending is not permitted during installation. When undergoing heat treatment and welding/cutting, the cut surfaces should be coated with a non-toxic, room-temperature curing adhesive provided by the manufacturer. The main specifications are: p15-4300。
First, check whether the plastic-coated steel pipe after thread machining matches the plastic-coated pipe or the lined plastic pipe. During pipe installation, thoroughly clean the threaded sections, end fillet welds, and threaded areas of the plastic-coated composite pipe, removing any oil or grease. Then, evenly apply a high-strength liquid epoxy resin coating to the threads and fillet welds. Plastic-coated steel pipes should be used, and plastic-coated pipe fittings should be installed.
Nominal diameter less than DN50 The coated composite pipe should be manually installed into the coated pipe fittings; the nominal diameter is greater than... DN50 The coated steel pipe should be installed using pipe wrenches. After installation, a high-strength, solvent-free liquid epoxy resin coating—extruded from the end face of the coated pipe and the threaded end of the coated pipe—forms a seal ring, which is then tightened around the end face and threads. Finally, the end cap is sealed to prevent corrosion of the pipe threads and the coated steel end face, achieving a watertight seal.
After the pipeline installation is completed, any damaged areas of the coated composite pipe should be repaired with a high-strength, solvent-free epoxy resin coating to prevent corrosion. Once the coated composite pipes and coated pipes have been installed, they must be allowed to dry naturally before being put into use again. 24 Water can be used only after a few hours. For the installation of plastic-coated composite pipes, pipe holes have been pre-reserved or sleeves have been pre-embedded at the pipe walls and connection plates. The coordinates and dimensions of these holes meet the specified requirements.
The formwork and debris along the installation location of the coated composite pipe shall be thoroughly cleaned. The supports, hangers, and clamps shall be installed firmly and in the correct positions. The depth of backfill over the pipe shall not be less than... 1.35M , the maximum backfill depth shall not exceed 6m When crossing gravity pipelines such as sewage and stormwater pipes, local lifting may occur. Pipeline installation should be straight and smooth.
Installation preparations and technical documents such as construction drawings are complete. The pipelines, valves, and other components have been inspected and accepted; the supervising engineer has checked and confirmed the product certificates, quality certificates, and quantities.
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