无溶剂液体环氧涂料在天然气管道热煨弯管外防腐层修复中的应用
The Application of Solvent-Free Liquid Epoxy in External Anti-Corrosive Coating Overhaul of Hot Induction Bends in Gas Pipelines
摘要: 长输管道广泛采用双层熔结环氧粉末涂层作为热煨弯管的外防腐层，在长期阴极剥离及地下水浸泡下，双层熔结环氧粉末涂层与热煨弯管钢管表面易出现粘结力不足现象，造成阴极保护电流损失，需要进行热煨弯管外防腐层修复。通过对比修复材料优缺点和在役天然气管道现场实际，推荐选取无溶剂液体环氧涂料进行修复；为增强机械强度和密封性能，采用聚丙烯胶粘带作为外防护带。介绍了修复材料技术要求，简述了施工流程和施工方案，阐述了质量控制方法。通过实际应用取得了良好的修复效果，保障了管道的安全运行。
Abstract: Double-layer fusion bonded epoxy is widely used as external anti-corrosive coating for hot induction bends in long-distance pipelines. When it is used under the condition of cathodic delamination and groundwater immersion, the adhesive strength between double-layer fusion bonded epoxy and the surface of hot induction bend will become insufficient, which leads to the damage of current cathodic protection; therefore, it is imperative to repair the external anti-corrosive coating. By comparing advantages and disadvantages of the repairing materials and practical condition of gas pipeline in service, it is advisable to choose solvent-free liquid epoxy as the repairing material. In order to enhance the mechanical strength and sealing performance, polypropylene adhesive is used as the outer protective belt. This thesis introduces technical indicator of repairing material, expounds construction procedure and construction scheme, and elaborates quality inspection method. This repairing technology has achieved ideal result in practical application and ensured the safe operation of gas pipelines.
文章引用：李世龙. 无溶剂液体环氧涂料在天然气管道热煨弯管外防腐层修复中的应用[J]. 石油天然气学报, 2021, 43(2): 112-119. https://doi.org/10.12677/JOGT.2021.432020

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