Steel pipes daily maintenance methods

　　In the use of pipes, the daily maintenance of steel pipes and pipe fittings is very important. Through regular maintenance and inspection, the service life of pipes and pipe fittings can be greatly extended. With the continuous development of China's economy and the vigorous development of energy industry, long oil and gas pipelines are an important way of energy security. In the process of anti-corrosion construction of oil and gas pipelines, the surface treatment of steel pipes is one of the key factors to determine the service life of pipeline anti-corrosion, which is the premise for the solid combination of anti-corrosion coating and steel pipes.

　　According to the verification of the research organization, the service life of the anticorrosive coating depends on the coating type, coating quality, construction environment and other factors, and the influence of the steel pipe surface treatment on the service life of the anticorrosive coating accounts for about 50%. Therefore, Hot Rolled Juneng Special Steel API 5CT L80 Casing Pipe surface treatment method should be continuously explored and improved in strict accordance with the requirements of the anticorrosive coating specification on the steel pipe surface.

　　Here we summarize several maintenance methods for steel pipes and pipe fittings: first, cleaning of steel pipes. Solvent and emulsion are used to clean the steel surface to remove oil, grease, dust, lubricant and similar organic matters. However, it can not remove rust, oxide skin and welding flux on the steel surface, so it is only used as an auxiliary means in anti-corrosion production. 2. Rust removal of steel pipe tools. It mainly uses steel wire brush and other tools to polish the steel surface, which can remove loose or raised oxide skin, rust, welding slag, etc. The rust removal of hand tools can reach level SA2, and that of power tools can reach level SA. If the steel surface adheres to solid oxide scale, the rust removal effect of tools is not ideal, and the depth of anchor pattern required by anti-corrosion construction cannot be reached. 3. Pickling of steel pipes.

　　Generally, chemical and electrolytic methods are used for pickling treatment. Chemical pickling is only used for pipeline corrosion protection, which can remove oxide skin, rust and old coating. Sometimes it can be used as the reprocessing after sand blasting. Although chemical cleaning can make the surface clean and rough, its anchor pattern is shallow and easy to pollute the environment.