The prefabricated direct buried thermal insulation pipe is used for indoor and outdoor various pipes, central heating pipes, central air conditioning pipes, chemical, pharmaceutical and other industrial pipelines for heat preservation and cold preservation projects. Due to the difference in the underground environment and the changes in the underground environment, it will have an impact on the use of prefabricated direct buried insulation pipes. Here, we will explain how to properly install and use prefabricated direct buried insulation pipes.
The corrosion resistance rating of the directly buried thermal insulation steel casing shall be determined according to the local soil corrosion grade. When the corrosion grade of the soil-buried insulation pipe is high, the corrosion protection grade should consider the special reinforcement grade. When the soil corrosion grade is medium, the corrosion protection grade should consider the reinforcement grade, when the soil corrosion grade is low. When the corrosion resistance level should be considered ordinary level. Therefore, it is necessary to understand the corrosion grade of the soil in the pipeline laying section in order to optimize the corrosion resistance level.
Used in water pipes to transport water, it can avoid the acid corrosion of pipes in the water, and it is wear-resistant and has a long service life, which reduces the trouble of water leakage maintenance in long-term use. It is also used in the industrial field and can be used quickly because it is easy to use and fast.
Directly buried insulation pipes are also widely used. They are not only resistant to corrosion and insulation, but also reduce impact and are not eroded in the soil. It can last for more than 30 years.
The cathodic protection of the direct buried thermal insulation pipe is a kind of electrochemical protection method in the metal anti-corrosion process. Different from other anti-corrosion processes for direct-buried insulation tubes, it applies a current to the protected metal body, thereby causing the electrode potential of the protected metal body to be negatively shifted, so that the metal loses its tendency to change from an atomic state to an ion state. The occurrence of corrosion is fundamentally suppressed. However, this process must be carried out in the electrolyte, so buried steel pipes are very suitable for cathodic protection. The cathodic protection complements the anti-corrosion layer of the directly buried thermal insulation pipe itself. The presence of the anti-corrosion layer can greatly reduce the current consumed by the cathodic protection, and the cathodic protection can compensate for the insufficiency of the anti-corrosion layer, thereby improving safety and economy. Achieving the perfect combination is currently recognized as the best anti-corrosion solution.
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