Anti-corrosion steel pipe is a kind of anti-corrosion treated pipe, mainly including 3PE anti-corrosion steel pipe (3PE coating), TEPE anti-corrosion steel pipe, epoxy coal tar pitch anti-corrosion steel pipe, high-density polyethylene jacket anti-corrosion steel pipe, etc. Among them, 3PE anti-corrosion and epoxy coal tar pitch anti-corrosion are the most popular ones in the market. The more commonly used outer wall anti-corrosion forms, then, what are the differences between 3PE anti-corrosion steel pipes and epoxy coal tar pitch anti-corrosion steel pipes? What is the method to distinguish 3PE anti-corrosion steel pipe and epoxy coal tar pitch anti-corrosion steel pipe?
1. The processing technology and processing process are different.
During the production and processing of 3PE anti-corrosion steel pipe, epoxy powder is sprayed onto the heated steel pipe. During the gelling and curing process of epoxy powder, the adhesive is wound, then polyethylene is wound, and then cooled by water to complete 3PE anti-corrosion; Most of the anti-corrosion steel pipes of oxygen coal tar pitch are artificially sprayed with anti-corrosion coatings on the steel pipes to form an anti-corrosion layer.
In general, epoxy coal tar pitch anti-corrosion steel pipes are generally brushed manually, and glass cloth is also manually operated. Now a few manufacturers use semi-mechanized operation methods, but they are still inseparable from manual operations, and the operation is relatively simple. Its production cost is relatively low; while 3PE anti-corrosion steel pipe requires special equipment, high requirements for mechanical automation, it belongs to the assembly line, and its unit price is high. about.
2. The thickness of the anti-corrosion layer is different.
SY/T 0447-1996 is a selected standard suitable for the production of epoxy coal tar pitch anti-corrosion coating. According to this standard, the thickness of the ordinary anti-corrosion coating is ≥ 0.20mm, and the thickness of the enhanced anti-corrosion coating is ≥ 0.40 mm. The thickness of the grade anti-corrosion is ≥ 0.60mm; while the thickness of the anti-corrosion layer of the 3PE anti-corrosion steel pipe, if it is low, can also reach 1.5mm, which has an advantage in the thickness of the anti-corrosion layer.
3. The application range is different.
3PE anti-corrosion spiral steel pipe has the advantages of strong corrosion resistance, high sealing performance, low PE water absorption, good mechanical properties, good electrical insulation performance, short continuous anti-corrosion construction period, etc. Therefore, 3PE anti-corrosion steel pipe is mainly used for water supply engineering and gas transportation. , buried water pipelines, etc.; and epoxy coal tar pitch is a high-performance anti-corrosion coating, with smooth, dense, hard, strong adhesion, salt and alkali resistance, seawater resistance, soil microbial corrosion resistance, anti-corrosion The combination of the coating and the glass fiber cloth can improve the mechanical properties of the anti-corrosion layer, and it is suitable for oil, gas, water pipelines, tap water, gas, pipelines, oil refineries, chemical plants, sewage treatment plants. Anticorrosion of equipment and pipes.
