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With China's sustained economic development, the state vigorously develop the energy sector, long-distance oil pipeline and gas pipeline are an important way of energy security in the oil and gas pipeline corrosion in the construction process, the surface of the steel pipe processing is to determine the service life of critical pipeline anti-corrosion First, it is a solid combination of anti-corrosion layer with steel pipe premise. Research institutions to verify the anti-corrosion layer of life in addition to factors depending on the coating type, coating quality and construction environment, the surface of the steel pipe processing affect about 50% of the life of anti-corrosion layer, therefore, should be strictly in accordance with the anti-corrosion layer specification the requirements of the surface of the steel pipe, and continuously explore and summarize the continuous improvement of the surface of the steel pipe approach.
Steel pipe maintenance procedure:
1, cleaning of the steel pipe
The use of solvents, emulsions, cleaning the steel surface, in order to achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, oxide, solder, so only as an auxiliary in the anti-corrosion production means.
2, pipe tools rust
The main use of wire brushes and other tools for steel surface polishing, can remove loose or tilt of the oxide scale, rust, welding slag, etc.. Hand tools, rust can reach Sa2 grade the power the tool rust can be reached Sa3 level, if the steel surface attached solid iron skin, tools rust effect is not ideal, anchor pattern depth amounted to less than anti-corrosion construction requirements.
3, steel pipe pickling
Generally to do with the chemical and electrolytic two methods of pickling, pipeline anti-corrosion chemical pickling, the descaling, rust, old coatings, sometimes used as a sand-blasting after reprocessing. Although chemical cleaning can achieve a certain surface cleanliness and roughness, but the bolt pattern is shallow, and easy on the environment caused by pollution.
