Research on Corrosion and Anti-Corrosion Technology of Buried Pipelines of Compressor Stations in Xinjiang Section of West-East Gas Pipeline
|School||Southwest Petroleum University|
|Course||Oil and Gas Storage and Transportation Engineering|
|Keywords||West-East Gas Compressor Station Buried pipeline Corrosion Solvent-free epoxy coating Anticorrosive|
The full length of the West-East Gas Pipeline 3900km, its trunk to use the 3-layer PE and the cathodic protection system, the joint protection of buried pipeline gas transmission station using a solvent-free epoxy coating anticorrosive. Initial production pipeline running smoothly, but 2007 and 2008 have been found in the round of South and Hami gas compression stations anticorrosion coating failure, the buried pipeline corrosion and leaks. The soil environment and anti-corrosion program of the four classes of compressor stations and they are similar in the excavation survey also found a similar problem, although no perforation leaked, but also the failure of the anti-corrosion layer and more serious corrosion, there is a big security risks, external corrosion of buried pipeline compressor stations for Xinjiang Section, in order to clarify the corrosion inherent reason, understanding the law of the corrosion, targeted anti-corrosion, to carry out this thesis, in order to protect The safe and continuous operation of the West-East pipeline, extending the life of the pipeline. The main research contents are as follows: (1) four classes of compressor stations Corrosion Investigation on Current Situation and soil analysis. Buried pipeline within the four classes of compressor stations excavation research and understanding of the status quo of its anti-corrosion technology status and pipeline corrosion; analysis, study of the physical and chemical properties of the soil test soil corrosive. (2) research the four classes station pipe corrosion behavior. Indoor electrochemical tests to analyze the corrosion resistance of the pipe; indoor soil corrosion simulation to analyze the impact of various factors on the corrosion in the soil solution; scene buried patch test to obtain the most direct pipe corrosion data, and its law analysis; EDS analysis and SEM analysis of the corrosion characteristics of each pipe. (3) ground station network of buried pipeline corrosion impact. Electrochemical testing and indoor soaking experiments to study galvanic corrosion behavior of the grounding grid electrical contact with the pipeline may occur, the results show that the galvanic effect is obvious. The compressor outlet outfall (4) galvanic corrosion experiments. Immersion test galvanic corrosion behavior may appear on the outfall on 3 dissimilar pipe connection, the results show that the galvanic effect is obvious. (5) The solvent-free epoxy coating in the performance evaluation of the the four classes station soil. Simulated soil solution immersion tests to evaluate the solvent-free epoxy coatings, anti-corrosion performance results that meet the design requirements of the solvent-free epoxy coating provides good protection to the pipe. (6) four classes station buried pipeline anti-corrosion measures. Recommended on the basis of research in the literature for four classes station anti-corrosion layer type, and according to the results of previous studies, corrosion governance measures.