某集气站埋地管道腐蚀失效原因分析
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摘要
对某集气站埋地管道的失效管段进行了宏观检查、腐蚀产物分析、管道材质与金相分析等,并开展了管道内部气/液两相流动计算和腐蚀模拟实验,综合分析了埋地管段腐蚀失效原因及腐蚀机理。结果表明:埋地管道的水样中存在大量的SRB,铁细菌和腐生菌,管道内流态为层流,管道底部5～7点钟部位发生了严重小孔腐蚀。细菌腐蚀和垢下腐蚀是导致管道腐蚀穿孔的主要原因,水中的Cl-加速了腐蚀穿孔的发生。
Corrosion failure of an underground pipeline for a gas gathering station was analyzed by means of corrosion morphology observation, corrosion product-and the material-analysis. While simulation of two-phase flow in the pipeline and corrosion tests were carried out in order to understand the corrosion mechanism of underground pipeline. Results showed that there existed a lot of sulfate reducing bacteria(SRB), saprophytic bacteria(TGB) and iron bacteria in the produced water; while the flow form of liquid in pipeline is laminar flow; and severe corrosion pits could be observed on 5～7 o 'clock position at the bottom of the pipe, which may be caused by microbiological influenced corrosion(MIC) and under-deposit corrosion. Besides, Cl-in the produced water could also accelerate the corrosion process.
Corrosion failure of an underground pipeline for a gas gathering station was analyzed by means of corrosion morphology observation, corrosion product-and the material-analysis. While simulation of two-phase flow in the pipeline and corrosion tests were carried out in order to understand the corrosion mechanism of underground pipeline. Results showed that there existed a lot of sulfate reducing bacteria(SRB), saprophytic bacteria(TGB) and iron bacteria in the produced water; while the flow form of liquid in pipeline is laminar flow; and severe corrosion pits could be observed on 5～7 o 'clock position at the bottom of the pipe, which may be caused by microbiological influenced corrosion(MIC) and under-deposit corrosion. Besides, Cl-in the produced water could also accelerate the corrosion process.
引文
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[4]Jiang X,Qu D R,Liu X H.Research development of top of line corrosion(TLC)in wet natural gas pipelines[J].J.Chin.Soc.Corros.Prot.,2011,31:86(蒋秀,屈定荣,刘小辉.湿气管线的顶部腐蚀研究概况[J].中国腐蚀与防护学报,2011,31:86)
[5]Jiang X,Liu Y,Fan J Z,et al.Corrosion failure analysis on a wastewater pipeline for a gas gathering station[J].Corros.Sci.Prot.Technol.,2017,29:195(蒋秀,刘艳,范举忠等.某集气站排污水管腐蚀失效原因分析[J].腐蚀科学与防护技术,2017,29:195)
[2]Wen J,Gu T Y,Nesic S.Investigation of the effects of fluid flow on SRB biofilm[A].Corrosion 2007[C].Nashville,2007:07516
[3]Hu A.Investigation of sulfate-reducing bacteria growth behavior for the mitigation of microbiologically influenced corrosion(MIC)[D].Athens:Ohio University,2004
[4]Jiang X,Qu D R,Liu X H.Research development of top of line corrosion(TLC)in wet natural gas pipelines[J].J.Chin.Soc.Corros.Prot.,2011,31:86(蒋秀,屈定荣,刘小辉.湿气管线的顶部腐蚀研究概况[J].中国腐蚀与防护学报,2011,31:86)
[5]Jiang X,Liu Y,Fan J Z,et al.Corrosion failure analysis on a wastewater pipeline for a gas gathering station[J].Corros.Sci.Prot.Technol.,2017,29:195(蒋秀,刘艳,范举忠等.某集气站排污水管腐蚀失效原因分析[J].腐蚀科学与防护技术,2017,29:195)