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| Effect of Coastal Soil Environment on Localized Corrosion for Oil and Gas Pipelines |
Xiao TANG( ),Chuntao SHI,Guang CAO,Yan LI |
| College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 266580, China |
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Abstract The direct cause for the explosion accident occurred by Dong Huang pipeline is that the corrosion of pipeline was enhanced by coastal soil, which in turn resulted in thinning and then cracking of the pipe. Because localized corrosion cracking in coastal soils is a serious threat to the integrity and security for the pipeline, the effect of the coastal soil environment on localized corrosion for oil and gas pipelines was analyzed systematically. Typical corrosion environmental characteristics were acquired and then analyzed firstly for the specified coastal soil, which in general is rather different from the terrestrial soil and seabed soil distinctly. The coastal soil is characterized as a mixture of gas/liquid/solid multi-phases with high salt- and water-content and good air aeration, while it experiences dry-wet cycles periodically. The effect of the coastal soil environment on the initiation and propagation of localized corrosion for oil and gas pipelines is discussed. Finally, the trends and difficulties of the study in oil and gas pipeline localized corrosion are analyzed, and in the end, a scheme of micro-e electrochemical study is peculiarly prospected.
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Received: 13 May 2015
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