干气调峰输送管道的内腐蚀直接评价方法  

In-line Inspection Corrosion Direct Assessment of Shutdown Dry Natural Gas Pipeline

作　　者：余冬良 明银龙 YU Dong-liang;MING Yin-long(Jiangxi Province Natural Gas Pipeline CO.,Ltd.Nanchang 360100,China;Safetech Research Institute,Co.,Ltd.Beijing 110000,China)

机构地区：[1]江西省天然气管道有限公司运营分公司,江西南昌360100 [2]安科工程技术研究院(北京)有限公司,北京110000

出　　处：《全面腐蚀控制》2024年第10期14-23,共10页Total Corrosion Control

摘　　要：根据完整性评价要求,新建管道在投用后3年内完成完整性评价。如果管道不具备内检测的条件,可使用内腐蚀直接评价的方法对管段进行评估。江西天然气某支线管道不满足内检测的要求,且存在停输情况,为评估管段的内腐蚀风险,对其内腐蚀直接评价,进行预评价、间接评价、直接评价、后评价,给出内腐蚀敏感高风险点,选择开挖点进行详细检查,并根据生产状况进行内腐蚀原因分析。研究结果表明:江西省某天然气管道最大壁厚损失为0.20mm,最大壁厚减薄率为2.3%,腐蚀程度轻微。生产阶段和停输阶段面临的腐蚀风险主要为CO_(2)腐蚀。According to the requirements of integrity evaluation,the integrity evaluation of the newly built pipeline will be completed within 3 years after it is put into operation.If the pipeline does not have the conditions for internal inspection,the method of direct evaluation of internal corrosion can be used to evaluate the pipe section.A natural gas pipeline in Jiangxi province does not meet the requirements of internal inspection,and this pipeline is in shutdown state sometime.In order to evaluate the internal corrosion risk of the pipeline section,the internal corrosion is evaluated directly,including pre-evaluation,indirect evaluation,direct evaluation and post-evaluation.The sensitive and high risk points of internal corrosion are given,the excavation points are selected for detailed inspection,and the causes of internal corrosion are analyzed according to the production conditions.The results show that the maximum wall thickness loss of a natural gas pipeline in Jiangxi is 0.20mm,the maximum wall thickness reduction rate is 2.3%,and the degree of corrosion is slight.CO_(2) corrosion is the main corrosion risk in production stage and shutdown stage.

关 键 词：内腐蚀 ICDA 天然气 停输管道 

分 类 号：TE88[石油与天然气工程—油气储运工程]