How to Select Spiral Pipes for Wastewater Treatment

Release date:

2022-02-28

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Steel Pipe Knowledge

The selection of spiral‑wound pipes should be guided by economic considerations. Higher‑grade steel pipes are slightly more expensive but can be made thinner; lower‑grade pipes are marginally cheaper but require thicker walls, so a cost‑benefit comparison is necessary. From the outlet to the inlet, varying wall thicknesses—two or three distinct grades—may be employed in response to pressure changes, with different wall thicknesses assigned to different pipe grades. For example, the outlet section might use a higher‑grade material, while the inlet section uses a lower‑grade material. Since piping costs account for roughly 25% of the total project investment, material selection must be carefully optimized.

　　The selection of material grade and welding requirements for sewage‑treatment spiral pipes is of paramount importance. Let’s take a look together with the editor from the spiral pipe manufacturer.

　　The selection of spiral‑wound pipes should be guided by economic considerations. Higher‑grade steel pipes are slightly more expensive but can be made thinner; lower‑grade pipes are marginally cheaper but require thicker walls, so a cost‑benefit comparison is necessary. From the outlet to the inlet, depending on pressure variations, two or three different wall thicknesses may be employed, with thick‑walled spiral‑wound pipes of varying grades corresponding to these thicknesses. For example, the outlet section might use higher‑grade material, while the inlet section uses lower‑grade material. Since piping costs account for roughly 25% of the total pipeline investment, material selection must be carefully optimized.

　　Precautions for Material Selection of Sewage Treatment Spiral Pipes:

　　1. When selecting strip steel, the first thing to consider is whether it comes from a reputable spiral pipe manufacturer. Strip steel produced by such manufacturers is of assured quality, albeit at a higher price than that from ordinary suppliers. At present, some spiral pipe manufacturers, in an effort to cut costs, resort to using strip steel from smaller mills, which cannot guarantee adequate integrity or consistent quality.

　　2. The material composition of strip steel is a common source of issues, and national standards specify precise limits for the content of various elements. When initially purchasing “di tiao” steel, the material cannot be visually inspected; one must rely on the material certificate provided by the steel mill. However, upon receipt, it is often unclear whether this certificate accurately corresponds to the specific batch of strip steel being purchased. Therefore, a representative sample of the purchased strip steel should be selected for testing. Specific requirements apply to the selection of these samples: three specimens must be taken from different locations, each measuring 40 mm in width and 80 mm in length. After the test results are available, they will be compared against the material certificate issued by the respective steel mill.

　　3. Check the strip steel surface for burrs, pits, pitting, and edge breaks. When the strip steel leaves the warehouse, it is wrapped in large bundles; the exterior is visible, but the interior is not. In fact, examining only the exposed outer surface and cross‑section is sufficient, as the production of the outer strip steel follows a standardized process. If there are no defects on the outside, the internal condition is generally sound. Furthermore, during the manufacturing of spiral welded pipes, after the strip steel has been straightened and leveled by a leveling machine, its appearance should be monitored continuously. If any issues are detected, promptly stop the line and perform repair welding.

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