If (1) cannot be performed for some reason, the evaluation results of (2) alone may be used, provided that the pipeline shall be tested once a year. The cohesion of the PE layer of 3PE is greater than the bonding force, which reduces the anti-cathode peeling ability of the cap layer, and achieves the purpose of anti-corrosion by melting the epoxy powder layer at the bottom. (2) Carry out the construction according to the recommended coating method, and carry out the field experiment evaluation for 5 years, and the anticorrosive coating system can be used if the anticorrosive coating function is kept good. I hope you can get some inspiration from this article in the early stage of pipeline anti-corrosion design, to choose the most appropriate anti-corrosion way for their own project, and improve the service life of the pipeline

According to years of experience of experts at home and abroad, only according to the detailed engineering premise, combined with the design life of the pipeline, environmental premise, operating parameters, construction technology and cost of comprehensive design, can the suitable anti-corrosion material be selected, in the detailed selection, I recommend the following procedures for selection and comparison: (1) Carry out the indoor experiment of the application environment of the anticorrosive coating material. If the results show that it is suitable, the next step can be carried out. Bonding function and anti-cathode stripping function bonding function refers to the bonding ability of steel and anticorrosive layer. (3) Resistance to mechanical damage Through the risk assessment of pipeline failure accidents, it is found that mechanical damage occupies the first place, erosion occupies the second place. For example: petroleum asphalt, anticorrosion tape are prone to flow damage, and heat shrinkage belt, heat shrinkage sleeve currently used in high temperature glue technology can be a good solution to this problem. There are more requirements for the anti-corrosion function of the buried steel pipeline, but the most important requirements are: (1) insulation resistance of the insulation function scale should not be less than 10000 ω m2 leakage voltage (i.e. breakdown voltage) can also reflect the insulation function of the thickness of the anti-corrosion layer. Therefore, the outer anticorrosive coating can withstand external mechanical damage is an important index of anticorrosive coating.

Because the industry of materials used in anticorrosion of buried pipeline, there are a lot of, our company produce of pipeline anticorrosion crosslinked polyethylene heat shrinkable belt, heat-shrinkable sleeve is now more commonly used a, so we in the outer pipe anticorrosion, must choose the most suitable anticorrosive way, when a line in front of our eyes, How to choose the scientific coating material is a very important topic, here I give you a more practical way to choose.

(4) Environmental stability refers to the adaptability of the anticorrosive layer to the erosion environment and temperature.