Steel pipes can be classified in various ways based on their production methods, cross-sectional shapes, wall thickness, and intended applications. Here is a detailed breakdown:
1. Classification by Production Methods
- Seamless Pipes: These are produced without any welds. They include hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, and top pipes.
- Welded Pipes: These are made by joining two edges of a steel plate or strip. They can be further divided into:
- By Process: Arc welded pipe, electric resistance welded (ERW) pipe (high frequency or low frequency), gas welded pipe, and furnace welded pipe.
- By Weld Seam: Straight seam welded pipe and spiral welded pipe.
2. Classification by Cross-Sectional Shape
- Simplified Section Pipes: These have regular shapes such as round, square, elliptical, triangular, hexagonal, diamond, octagonal, semi-circular, and other standard forms.
- Complex Section Pipes: These have irregular or unique shapes like unequal hexagonal, five-petal plum-shaped, double convex, double concave, melon-shaped, conical, corrugated, and case-shaped pipes, among others.
3. Classification by Wall Thickness
- Thin-Walled Pipes: Used in applications where weight and flexibility are important, such as in heat exchangers or lightweight structures.
- Thick-Walled Pipes: Designed for high-pressure environments and heavy-duty applications, such as in pipelines or industrial equipment.
4. Classification by Use
- Pipeline Steel Pipes: Used for transporting fluids and gases over long distances.
- Thermal Equipment Pipes: Designed for use in boilers, heat exchangers, and other thermal systems.
- Mechanical Industry Pipes: Applied in machinery and structural components.
- Petroleum and Geological Drilling Pipes: Used in oil and gas drilling operations.
- Container Pipes: For use in shipping containers or storage tanks.
- Chemical Industry Pipes: Resistant to corrosion and suitable for chemical processing environments.
- Special Purpose Pipes: Custom-made for specific applications such as aerospace, medical devices, or high-performance engineering.
This classification helps engineers and designers select the most appropriate type of steel pipe based on the requirements of their projects.
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