3PP Pipe Anti-Corrosion Method
Release time:
2020-10-29
As one of the fundamental corrosion protection methods used in pipeline coatings, 3PP piping boasts relatively high strength among surface anti-corrosion coatings for pipelines. Since the 1970s, pipelines have been continuously exposed to harsh environments in polar and marine regions.
3PP As one of the fundamental corrosion protection methods used in pipeline coatings, the pipeline coating also boasts relatively high strength among surface corrosion protection layers. Since... 20 Century 70 For decades, the pipeline has been exposed to the harsh conditions of polar and marine environments.
3PP Due to the heating and transportation of petroleum, pipeline temperatures rise, placing higher demands on coating performance. Consequently, an increasing number of composite materials or composite structures are being used for pipeline corrosion protection. Exterior wall anti-corrosion coatings: Types of materials and construction conditions for pipeline exterior wall coatings.
3PP Anti-corrosion coating for pipe inner walls: A protective film applied to the inner surface of pipes, designed to prevent corrosion, reduce frictional resistance, and enhance conveying capacity. Commonly used coatings include polyamide epoxy resins, with a thickness of... 0.2mm Moreover, to ensure the adhesion between the coating and the pipe wall, we must perform surface treatment on the inner wall of the pipe.
Moreover, the same material is used for both the inner and outer walls of the pipeline. To reduce heat loss from the pipeline into the soil, an additional thermal insulation and anti-corrosion composite layer has been added to minimize heat dissipation. The commonly used thermal insulation material is rigid polyurethane, with a temperature range of... -185~95 Degree. This material is very soft.
To prevent polyethylene from forming a high-density insulation layer outside the insulation layer and to enhance the strength of the insulation layer, 3PP Piping alters the electrode potential of the metal relative to its surrounding medium, thereby preventing metal corrosion. In long-distance pipelines, electrical protection refers exclusively to cathodic protection—a method that prevents metal corrosion by polarizing the protected metal to a cathodic state. This approach is also applied in ship corrosion prevention. 3PP Pipeline.
The principle of using a non-corrosive cathode and a corrosive anode in metal corrosion cells is applied to metal corrosion protection technology. If an external current is used to cathodically polarize the surface of the protected metal in the electrolyte, corrosion will not occur. Judgment: 3PP There are two indicators to determine whether the pipeline has achieved cathodic protection.
First is the lower protection potential—the potential at which cathodic polarization of the metal in the electrolyte intersects with the end of the corrosion process. Its value is influenced by environmental factors and other variables. A commonly used value is: 850mv Second, there is the maximum protection potential—the maximum allowable potential value on the surface of the protected metal. When cathodic polarization is too severe, hydrogen gas will be generated between the pipeline surface and the coating, leading to cathodic disbondment of the coating.
Therefore, it is necessary to... 3PP The pipeline coating is controlled within the allowable range from the permitted convergence point. This value is closely related to the coating’s performance. There are two methods for achieving pipeline protection: the impressed current method and the sacrificial anode method. The impressed current method uses a DC power source. The negative electrode is connected to the protected pipeline, while the positive electrode is connected to the anode ground bed. After the circuit is established, when the pipeline’s potential relative to earth reaches the minimum protective potential, cathodic protection is achieved under these circumstances.
3PP The pipeline can be powered by a standard DC power supply, particularly a rectifier. The DC output is typically in... 60V and 30A The following new types of DC power sources—including thermoelectric generators and solar cells—are widely used in regions lacking reliable electricity. The anode ground bed is connected to the positive terminal of the DC power source, ensuring good electrical contact with the earth.
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