Plastic-coated composite steel pipes for chemical pipelines: With the continuous development of the chemical industry, the requirements for pipeline materials are getting higher and higher. Traditional steel pipes, cast iron pipes and other pipe materials have been difficult to meet the needs of modern chemical production. Therefore, as a new type of pipeline material, plastic-coated composite steel pipe has gradually been widely used in the chemical industry. In this paper, the characteristics, applications and production processes of plastic-coated composite steel pipes for chemical pipelines will be introduced and analyzed. Manufacturers of plastic-coated steel pipes inside and outside
1. Characteristics of plastic-coated composite steel pipes.
Plastic-coated composite steel pipe is a composite pipe composed of inner and outer steel pipes and intermediate plastic layers. This pipe material has the following characteristics:
1.Strong corrosion resistance: The plastic layer of the plastic-coated composite steel pipe has good corrosion resistance, which can effectively prevent the corrosion of acids, alkalis, salts and other chemicals, thereby prolonging the service life of the pipeline.
2.Low fluid resistance: The inner wall of the plastic-coated composite steel pipe is smooth and not easy to adhere to impurities, which can effectively reduce the fluid resistance and improve the fluid transportation efficiency.
3.Various connection methods: Plastic-coated composite steel pipes can be welded, flanged, clamped and other connection methods, which are convenient for installation and maintenance.
4.High strength: The inner and outer steel pipes of plastic-coated composite steel pipes have good mechanical strength and can withstand high pressure and temperature.
5.Environmental protection: The plastic layer of the plastic-coated composite steel pipe can be reused, which is conducive to environmental protection.
Second, the application of plastic-coated composite steel pipes.
Due to the above advantages, plastic-coated composite steel pipes have been widely used in the chemical industry. For example, in the petrochemical industry, plastic-coated composite steel pipes can be used to transport oil, natural gas and other fluids;In the chemical fiber industry, plastic-coated composite steel pipes can be used to transport acids, alkalis, salts and other chemicalsIn the pharmaceutical industry, plastic-coated composite steel pipes can be used to transport high-purity fluids such as pharmaceuticals and biological products.
3. The production process of plastic-coated composite steel pipe.
The production process of plastic-coated composite steel pipe mainly includes the following steps:
1.Processing of internal and external steel pipes: According to different specifications and requirements, different processing methods are adopted, such as seamless steel pipes, welded steel pipes, etc. The inner and outer steel pipes need to be treated with rust removal and polishing to ensure the quality and cleanliness of the surface.
2.Production of plastic layer: According to different material and process requirements, extrusion, spraying and other methods are used to produce plastic layer. The plastic layer needs to have corrosion resistance, high temperature resistance and other properties, and at the same time have good adhesion to the inner and outer steel pipes.
3.Molding of plastic-coated composite pipes: The treated inner and outer steel pipes and plastic layers are hot-pressed or cold-pressed to form plastic-coated composite pipes. During the molding process, parameters such as temperature and pressure need to be controlled to ensure the quality and performance of the tube.
4.Quality inspection and finished product storage: quality inspection of the produced plastic-coated composite pipes, such as appearance, size, performance and other aspects of testing. Qualified pipes are packed and put into storage, waiting to be sold or used.
IV. Conclusions. As a new type of pipeline material, plastic-coated composite steel pipe has been widely used in the chemical industry. It has the advantages of strong corrosion resistance, low fluid resistance, diverse connection methods and high strength, which can meet the needs of different chemical production. With the continuous progress of technology and the continuous expansion of application fields, plastic-coated composite steel pipes will still have good market prospects and development potential in the future.