Discussing the internal anti-corrosion technology for petrochemical pipelines

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1. Coating corrosion prevention technology: Due to the special nature of oil refining, pipelines used in certain specific environments are subject to severe corrosion. In particular, corrosion and perforation occur frequently in the circulating water system, wastewater system, and acid-base system. Epoxy liquid coatings and epoxy powders are used, and are widely applied in sewage pipes. The accompanying internal coating patching techniques include pipe end expansion liner splices, steel memory alloy joints, mechanical crimping, and mechanical quick-connect joints, which can meet the anti-corrosion requirements for steel pipes with diameters ranging from D60 to 325 mm. Automatic pipe alignment and internal anti-corrosion patching machines can be used for the anti-corrosion treatment of pipes with diameters ranging from D114 to 168 mm. The continuous construction technology for the internal anti-corrosion layer was implemented, ensuring the quality of spraying. Repairing old pipes that are severely corroded involves the use of techniques such as coating and curing, inserting plastic pipes, reversing hoses, and pre-forming followed by secondary curing; these methods enable the pipes to be put back into normal use, resulting in good economic benefits. 2. Pipeline cathodic protection technology: In recent years, cathodic protection technology in China has developed rapidly, with improvements being made in cathode materials, remote monitoring and control of protection parameters, as well as protection power supplies. The potentiostat equipment has been improved in terms of power protection; by utilizing switching power supplies, signal transmission interface technologies, and computer technology, a potential measurement technique that eliminates the need for IR drop regulators has been achieved. This has enabled automated control and unattended operation, thereby improving the level of management. 3. Anti-corrosion technology for above-ground pipelines: In petroleum refining plants, there are many types of fluids flowing through pipelines; some of these are at high temperatures and pressures, and the corrosive agents involved are complex, leading to severe corrosion. This often results in pipe perforations and leaks, which can even cause fires and explosions, posing a serious threat to human safety, disrupting normal production, and contaminating the environment. Special steel, plastics, fiberglass, linings, metals, spraying, coatings, and other materials are commonly used for corrosion protection.