Large Diameter Spiral Steel Pipe

Large diameter spiral steel pipe is performed according to the AWWA C200 standard (American Water Works Association, 2017b). They are manufactured primarily with the spiral-welded pipe method. The spiral-weld process is continuous, and the continuous cylinder produced by spiral welding is cut with plasma cutting at specific intervals, depending on the required length. This pipe segment is the primary component of pipe production and is called "pipe joint" or "stick". Normally, the length of a pipe stick is 50 ft, but quite often, depending on the project requirements, 1/2-joints or 1/4-joints are produced.

Large diameter spiral steel pipe which are pipe segments with length equal to one-half or one quarter of the original length respectively. After cutting, each pipe segment is hydro tested in the pipe mill up to a pressure level of 75% of nominal yield pressure, as required by AWWA C200, or at the level specified by the purchaser. If lap welded joints are required for the pipeline, each pipe is expanded in one end to form a bell, so that the end part of the adjacent pipe is inserted and welded. In the case of rolled-groove rubber gasket joints, one end of the pipe is expanded and the other end is roll-shaped.

High strength: Large diameter spiral welded pipe has high tensile strength, compressive strength and impact resistance, and is suitable for various harsh environments.

Good corrosion resistance: Steel pipe surface treatment technology (such as anti-corrosion paint, epoxy resin coating, etc.) can improve the corrosion resistance of steel pipes and prolong their service life.

Saving materials and reducing costs: The manufacturing process of large-diameter spiral steel pipes can effectively reduce material consumption and reduce engineering costs.

Environmental protection performance: The steel pipe material can be recycled, which is in line with the concept of green environmental protection.

Convenient construction: The spiral steel pipe is connected by welding, and the construction process is simple and fast.

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