First, what are the causes of uneven anti-corrosion thickness in 3PE anti-corrosion steel pipes?
The industry standard SY/T0413-2002 does not specify uniformity of thickness, only a minimum coating thickness value. However, it requires that the minimum coating thickness cannot be lower than the thickness at the lowest point, not the average of multiple test points. If the coating thickness is uneven during the 3PE anti-corrosion steel pipe coating process, it will inevitably lead to a waste of coating material. This is because to ensure the coating thickness in the thinnest areas meets the minimum standard, the thickness in the thickest areas will be significantly greater than the standard coating thickness. Furthermore, uneven coating can easily result in the coating thickness in the thinnest areas of the 3PE anti-corrosion steel pipe not meeting the standard. The main reasons for uneven thickness during production are uneven material extrusion at different points and pipe bending. Effective methods to control uneven coating thickness in 3PE anti-corrosion pipes include adjusting the extrusion dies to make the anti-corrosion coating thickness as uniform as possible at different points, and refraining from coating unqualified steel pipes.

Second, how can 3PE anti-corrosion steel pipes be transported to ensure the anti-corrosion layer remains undamaged?
3PE anti-corrosion steel pipe is a high-grade anti-corrosion steel pipe composed of three layers: primer, adhesive, and PE. It boasts high corrosion resistance, high wear resistance, and a normal service life of approximately 30 years. Its high-quality anti-corrosion layer is crucial; however, if damaged, corrosion occurs rapidly, and the 3PE anti-corrosion steel pipe itself is highly susceptible to damage. Therefore, the pipe must be protected during transportation. Generally, transportation is by truck, and special protection is essential. Since trucks typically have steel-plated cargo beds, direct contact between the 3PE anti-corrosion steel pipes and the cargo bed is unacceptable. Straw mats or cotton pads must be used as padding before placing the anti-corrosion steel pipes on top. After each layer, another layer of straw mats or cotton pads should be added to prevent direct friction between the layers. The steel posts on both sides of the truck should be wrapped with cotton cloth to prevent side wall abrasion. When packing the pipes, wide and long straps should be used for packaging.