采用宏观检查、X射线衍射(XRD)、化学成分分析、力学性能测试、金相观察、硬度测试等表征手段对我国某海上油田X70高频电阻焊海底输气管道回收段进行腐蚀评价.通过基于现场环境的实验室内腐蚀模拟试验探讨了海管腐蚀的原因,并预测了管道的剩余强度和剩余寿命.结果表明:管道内壁为极严重腐蚀,计算得到该管道剩余强度为33.24 MPa,剩余腐蚀寿命至少为7.06 a.同时提出了后续建议及改进措施.
Macroscopic analysis,X-ray diffraction (XRD),chemical composition analysis,mechanical property test,metallographic analysis and hardness test were used to investigate the recycling pipe section from a submarine gas transmission pipeline of high frequency resistance welded X70 steel pipe.Based on site environmental conditions,internal corrosion simulation experiments were performed to find the corrosion reasons,and to predict the residual strength and residual lifespan of the pipeline.The results show that the inner-wall of the pipe corroded seriously.According to the calculation,the residual strength was 33.24 MPa and residual lifespan of the pipeline was at least 7.06 years.In addition,some improvements and suggestions are proposed in detail.
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