One: In the production process of spiral steel pipe, the epoxy powder and the adhesive should be 1% larger than usual , so as to achieve the actual required thickness.
Second: Do not expose to high temperature after the spiral steel pipe is taken off the line. Exposure can easily lead to the expansion of the PE layer and thus the outer wall of the steel pipe, which will not achieve the anti-corrosion effect.
Three: Do not be exposed to rain after the spiral steel pipe is taken off the line. It is easy to cause water seepage at the pipe joint after rain.
Four: After the spiral steel pipe is taken off the line, it should be placed in a flat place, and it should be placed flat. Do not squeeze each other. If the extrusion type is placed at least 24 hours, the PE layer should be completely attached to the outer wall of the steel pipe. .
3PE anti-corrosion structure:
Ordinary grade ≥ 0.70 one layer of primer + one layer of inner layer + one layer of outer belt
Reinforced grade ≥ 1.40 layer of primer + inner layer (overlap is 50~55% of tape width )
One layer of outer tape (overlap is 50~55% of tape width )
It is mainly used for oil and natural gas transmission; the outer surface of buried steel pipelines such as water supply and drainage and gas transportation in chemical and urban construction is anti-corrosion, which has the characteristics of convenient construction and no pollution. Polyethylene PE anti-corrosion adhesive tape has been widely used as an outer anti-corrosion material on oil and gas steel pipelines since the 1960s . It has been used for more than 40 years. Due to its excellent anti-corrosion performance and convenient construction performance, it has made it an anti-corrosion material for pipelines. The system has a certain position. And since the polyethylene coating tape production enterprises continuously improve and enhance polyethylene PE variety and quality of anti-corrosion adhesive tape, so that the polyethylene PE applications anticorrosion adhesive tape expanding.