Steel pipes can be classified in various ways based on their production methods, cross-sectional shapes, wall thickness, and intended applications. Understanding these classifications helps in selecting the right type of pipe for specific engineering or industrial needs.
1. Classification by Production Methods (1) Seamless Pipes – These are made without any welds and include hot-rolled, cold-rolled, cold-drawn, extruded, and top pipes. They are known for their strength and durability. (2) Welded Pipes – These are formed by welding steel plates or sheets. They can be further divided into: (a) By process – Arc welded pipes, electric resistance welded (ERW) pipes (high frequency or low frequency), gas welded pipes, and furnace welded pipes. (b) By weld seam – Straight-seam welded pipes and spiral-seam welded pipes. The latter is commonly used in large-diameter pipelines due to its structural integrity.
2. Classification by Cross-Sectional Shape (1) Simple Section Pipes – These have regular geometric shapes such as round, square, elliptical, triangular, hexagonal, diamond, octagonal, semi-circular, and other standard forms. (2) Complex Section Pipes – These have irregular or more intricate shapes like unequal hexagonal, five-petal plum-shaped, double convex, double concave, melon-shaped, conical, corrugated, case-shaped, and other specialized forms. These are often used in unique engineering applications where standard shapes are not suitable.
3. Classification by Wall Thickness (1) Thin-Walled Pipes – These have a relatively small wall thickness and are typically used in lightweight or non-load-bearing applications. (2) Thick-Walled Pipes – These are designed for high-pressure environments and heavy-duty applications, such as in oil and gas pipelines or industrial machinery.
4. Classification by Use (1) Pipeline Steel Pipes – Used for transporting liquids, gases, or other materials over long distances. (2) Thermal Equipment Pipes – Designed for use in boilers, heat exchangers, and other thermal systems. (3) Mechanical Industry Pipes – Used in manufacturing and mechanical systems. (4) Petroleum and Geological Drilling Pipes – Specifically designed for oil drilling and exploration. (5) Container Pipes – Used in the construction of storage tanks and containers. (6) Chemical Industry Pipes – Resistant to corrosion and suitable for handling chemical substances. (7) Special Purpose Pipes – Custom-made for specific industries or unique requirements.
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