Plastic-coated steel pipes have smooth walls, good drainage performance, low fluid resistance, and non-scaling of gas-coated steel pipes are advantages compared to other pipelines, which can greatly reduce losses. At the same time, the linear expansion coefficient of the large-diameter plastic-coated pipe is very small, which makes it very advantageous as a main water pipe, which greatly overcomes the defect of large linear expansion coefficients of other plastics and ordinary pipes. Large-diameter plastic-coated steel pipe is an upgraded version of traditional steel-plastic pipe and galvanized pipe with high cost performance. It has the comprehensive characteristics of high strength, high extensibility, good low temperature brittleness, small expansion coefficient of steel pipe, and plastic pipe corrosion resistance, abrasion resistance, and low fluid resistance. It is a new type of water supply and drainage, anti-corrosion green Large-caliber pipes are being used more and more widely in various domestic industries. Features 1. Large-caliber plastic-coated steel pipes are suitable for buried and humid environments, and can withstand high and very low temperatures. 2. No burr, smooth tube wall, not easy to scale and breed microorganisms. 3. Good pressure strength, high pressure up to 6Mpa4, excellent corrosion resistance 5. Low water absorption, high mechanical strength, low friction coefficient, can achieve the purpose of long-term use. Fire-fighting plastic-coated steel pipe is the most demanded plastic-coated composite pipe today. It is a nationally designated fire-fighting pipe and is also an environmentally friendly green pipe with the highest comprehensive cost-effectiveness. It is widely used in the field of fire-fighting sprinkler water supply. Let me share with you the detailed processing engineering of the pipe. The processing technology of fire-fighting plastic-coated pipe is divided into four types: hot dipping, high-pressure static spraying, rotomolding, and overmolding. And the processing process is also different for different connection methods. The raw materials required for this product are plastic powder and steel pipe. At the beginning of the whole process, raw materials need to be purchased. The plastic powder used for fire protection is epoxy resin. The steel pipe type used is seamless steel pipe, straight seam steel pipe or spiral pipe. The wall thickness needs to be measured. Next, the steel pipe is cut to the required length specification, and the port of the pipe needs to be polished to remove burrs. If the required pipe connection is a groove, you need to use a roll groove machine to press the groove. The width and depth of the groove need to be installed with CJ/T156-2001 standard. Note that the end of the pipe needs to be flat, free of burrs, and the groove is too deep. It should be regarded as a waste product and must not be used; the support or adjustment frame must not be supported on the connecting head, and there must be a support or hanger between any two connecting heads of the horizontal pipe. If the product is a flange connection, you need to make a flange piece. Before welding the flange piece, you need to remove the oil on the top, and then weld the flange piece and the steel pipe firmly as required.