榆林-济南天然气管道缺陷复合材料修复设计

目前国内尚无完善的设计规范和标准来指导对缺陷管道进行复合材料补强设计。国外较常见的设计方法是依托管道剩余强度评价，使用等效强度方法进行补强。为此，根据碳纤维复合材料管道修复补强技术原理和设计方法，提出了模拟管道壁厚完全损失的保守设计方法。应用该方法对榆林-济南天然气管道进行了碳纤维复合材料缠绕补强修复和防腐作业，采用绝缘材料进行垫底处理，彻底杜绝了电偶腐蚀的可能性，修复后管道恢复正常运行压力，补强效果良好，确保了补强设计的安全有效性。

Rehabitation design of composite materials for the defects of the Yulin-Jinan natural gas pipelines

Presently, there are no well established domestic design specifications and standards which can be taken as a reference for the pipeline strength rehabilitation with composite materials. The common design method used in foreign countries is based on the pipeline residual strength assessment and uses the equivalent strength method for strength rehabilitation. This paper hereby puts forward the conservative design method which simulates the complete loss of the pipe wall thickness based on the principle and design method of pipeline strength rehabilitation with carbon fiber composite material. With this method, carbon fiber winding strength rehabilitation and anti corrosion operation are applied in the Yulin Jinan Natural Gas Pipeline, and the rebase operation by use of insulating material is also applied, which completely eliminates the possibility of galvanic corrosion. The pipeline restores its normal operating pressure after the rehabilitation, and the rehabilitation effect is good, which ensures the safety and effectiveness of the pipeline strength rehabilitation design.