埋地钢质燃气管道跨越段外腐蚀分析及防护  

External Corrosion Analysis and Protection for Crossing Section of Buried Steel Gas Pipeline

作　　者：陈国培 伏喜斌 范成龙 庄鹏辉 林迪 Chen Guopei;Fu Xibin;Fan Chenglong;Zhuang Penghui;Lin Di(Xiamen Special Equipment Inspection Institute,Xiamen 361004)

机构地区：[1]厦门市特种设备检验检测院,厦门361004

出　　处：《中国特种设备安全》2024年第11期88-93,共6页China Special Equipment Safety

基　　金：厦门市市场监管局科技项目“随桥敷设燃气管道运维安全技术研究”(XMSJ202301)。

摘　　要：城镇钢质燃气管道定期检验中发现受外界环境的影响,埋地钢质燃气管道跨越段的两端出现防腐层脱落和表面腐蚀现象。通过目视检查、泄漏检查、壁厚测量、渗透检测以及超声导波检测等手段对问题管道进行检测,对管道的腐蚀严重程度进行评估,分析腐蚀原因。结果表明:家禽粪便和植物分泌物损伤跨越段钢质管道外表面,造成防腐层脱落和严重的外腐蚀,产生较大的金属腐蚀速率,带来严重安全隐患和使用风险,应立即对腐蚀管道进行防腐处理,做好物理隔离防护,加强日常巡逻和监管。During the regular inspection of urban steel gas pipelines,it was found that large areas of external surface corrosion occurred at both ends of the crossing section of buried steel gas pipelines,due to the influence of the external environment.Through visual inspection,leak detection,wall thickness measurement,penetration testing and ultrasonic guided waves,the problematic section of pipeline was detected to evaluate its corrosion severity,and analyzed the causes of corrosion.The results showed that poultry manure and plant secretions damaged the outer surface of crossing steel pipe,causing the anti-corrosion layer to fall off and severe external corrosion,resulting in a large metal corrosion rate,posing serious safety hazards and usage risks.Therefore,the corroded pipeline should be immediately treated with anti-corrosion measures and physically isolated for protection.Daily patrols and supervision should be strengthened.

关 键 词：钢质燃气管道 跨越管道 腐蚀分析 腐蚀防护 

分 类 号：X933.4[环境科学与工程—安全科学]