The structural characteristics of steel lined polypropylene (PP) pipelines are mainly reflected in their composite structure and material selection. The following is a specific analysis:
1、 Composite structure
Steel lined polypropylene pipeline is a composite pipeline composed of two layers of materials:
Inner lining layer: Polypropylene (PP) plastic is used as the inner lining layer. Polypropylene is a thermoplastic with excellent corrosion resistance and the ability to resist erosion from various chemicals. Meanwhile, polypropylene material is non-toxic, odorless, and meets hygiene standards, making it suitable for industries such as food and pharmaceuticals.
Base layer: ordinary carbon steel pipe is used as the base layer. Carbon steel pipes have high strength and good mechanical properties, and can withstand large pressures and loads. The substrate layer provides solid support for the inner lining layer, ensuring the stability and safety of the pipeline.
2、 Material selection
Polypropylene material:
Strong corrosion resistance: able to resist the erosion of various corrosive media, such as acid, alkali, salt, etc.
Good heat resistance: It has good heat resistance and can be used for a long time at high temperatures without deformation or softening.
Excellent low-temperature resistance: able to maintain good flexibility and strength in low-temperature environments, not easily brittle.
Non toxic and hygienic: meets hygiene standards and is suitable for industries such as food and pharmaceuticals.
Carbon steel pipe:
High strength: It has high strength and can withstand significant pressure and load.
Good mechanical performance: It has excellent mechanical properties such as impact resistance and vibration resistance.
3、 Forming process
The forming process of steel lined polypropylene pipes usually adopts techniques such as rotational molding or cold drawing composite. Roll molding is the process of adding plastic raw materials into a mold, which continuously rotates and heats along two vertical axes, gradually and uniformly coating, melting, and adhering the plastic raw materials to the entire surface of the mold cavity, and then cooling, shaping, and demolding. Cold drawn composite is a process of tightly bonding polypropylene inner lining with carbon steel pipes through specific techniques.
4、 Structural advantages
Corrosion resistance: Due to the use of polypropylene material in the inner lining, steel lined polypropylene pipes have excellent corrosion resistance and can be used for the transportation of various corrosive media.
Mechanical strength: The substrate layer is made of carbon steel pipe, ensuring the mechanical strength and stability of the pipeline, and can withstand large pressures and loads.
Hygiene standards: Polypropylene material is non-toxic, odorless, and meets hygiene standards. It is suitable for industries such as food and pharmaceuticals that require high hygiene standards.
Easy installation: There are various connection methods for steel lined polypropylene pipes, including flange connection, clamp connection, etc., making installation simple and fast.
In summary, the structural characteristics of steel lined polypropylene pipelines are mainly reflected in their composite structure, material selection, and molding process. These characteristics make steel lined polypropylene pipes have excellent corrosion resistance, mechanical strength, hygiene standards, and installation convenience, and are widely used in fields such as chemical engineering, biology, electricity, smelting, pharmaceuticals, food, and environmental protection.