Precautions for purchasing large diameter straight seam steel pipes

The purchase of large-diameter straight seam steel pipes (LSAW pipes) should be communicated in advance. Before purchasing steel pipes (seamless pipes or welded tubes), you should follow the pre-designed specifications, length, material, wall thickness, welding standards and weld seam requirements. These must be communicated before purchase.

The first is the specification, for example, 800mm is also called DN800, including 820mm and 813mm of A and B series, or the outer diameter of 800mm must be clearly specified to avoid unnecessary losses. The wall thickness of large diameter straight seam steel pipe is required to be 16mm. It is possible that the actual thickness of the raw material will be 15.75mm and 16.2mm, and there will be upper or lower differences, which are normal deviations. Because straight seam steel pipes are priced per ton, communication is required in advance to avoid weight differences.

The normal length of large-diameter straight seam steel pipe is 12m. When the length needs to be fixed, it needs to be communicated in advance, because the price of the fixed length will be more expensive, or the length of 9.87m will be required without prior communication, and the manufacturer generally gives 9.9m directly.

The materials for purchasing large-diameter straight seam steel pipes should also be well communicated, and materials cannot be used as OEMs. In addition, the materials should be guaranteed, and the original material list of the steel factory should be provided. Any material problems will be returned and compensated. The welding standards for production and processing must be in accordance with automatic submerged arc welding LSAW GB/T3091-2015, and a product quality certificate is required. If the standard does not meet the requirements, the product fails.

When purchasing large-diameter straight seam steel pipes, it is required to communicate in advance about the levels of weld flaw detection. In addition, large-diameter straight seam steel pipes above 1020mm may produce two welds. Many projects will not accept two welds without prior communication, and will be called defective steel pipes.

Therefore, it is necessary to communicate well in advance before purchasing any steel pipes, which will cause unnecessary disputes and economic losses.

Article source: https://article-realm.com/article/Finance/42223-Precautions-for-purchasing-large-diameter-straight-seam-steel-pipes.html