The diameter range of large-diameter welded pipes is relatively wide. Generally speaking, the diameter of large-diameter welded pipes is usually above 500 mm. In some specific engineering fields, the diameter can reach several meters or even larger.

In some large oil pipeline projects, the diameter of large-diameter welded pipes may reach more than 1000 mm.

In urban water supply and drainage projects, the diameter of large-diameter welded pipes is usually between several hundred millimeters and one or two meters, and is used to transport large amounts of domestic water and sewage.

Welded steel pipe, also known as spiral welded pipe, is a steel pipe made by welding steel plates or strips after curling and forming. Welded steel pipe has a simple production process, high production efficiency, many varieties and specifications, and low equipment investment, but its general strength is lower than that of seamless steel pipe. The maximum diameter of spiral steel pipe is currently produced to 4020mm.
Due to the limitations of the manufacturing process, the diameter of the spiral pipe cannot be increased indefinitely. The maximum diameter of the spiral pipe can reach 4020mm. As the diameter increases, the thickness of the steel pipe will also increase accordingly to withstand greater pressure and provide stronger support. Therefore, a balance needs to be achieved between the length and diameter of the spiral pipe.

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