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CHEMICAL AND ELECTROCHEMICAL METHODS OF PROTECTION FROM CORROSION OF GAS AND OIL PIPELINES PIPELINESAND STORAGE TANKS

Ass. Prof. Svetlana Alexandrovna Ivanik, Ass. Prof. Evgeniy Anatolevich Lyubin

Abstract

Corrosion is a process of spontaneous physicochemical destruction of metal, leading to irretrievable loss of metal, due to its chemical or electrochemical interaction with the environment. As a result of corrosion processes, the surface of the metal is visibly destroyed. However, the concept of corrosion includes not only visible surface fractures of the metal, but also cases of internal intergranular destructive influences, proceeding outwardly imperceptibly, but being one of the most dangerous types of destruction. The protection of metal structures (such as oil and gas pipelines and tanks) from the destructive effects of corrosion processes remains one of the most serious and complex tasks of modern technology, since the damage caused by corrosion is huge, so that about 20% of the total amount of metals is lost annually due to corrosion, and huge funds are spent on protecting metal structures from corrosion. In addition, downtime of equipment while replacing corroded parts and assemblies, leakage of products and violation of technological processes lead to disruption of the normal operation of the technological cycle, causing huge economic losses. This article shows the main advantages and disadvantages of existing methods of protection of oil and gas pipelines and tanks against corrosion. The methods of protection considered in the article are based on such principles as reduction of corrosion by imposing an external current, increasing the chemical resistance of structural materials, isolating the metal surface from an aggressive environment, and reducing the aggressiveness of the production. Such methods allow creating new protection regimes ensuring the least corrosion of gas and oil pipelines and reservoirs.

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