【作者】 何仁洋； 陈钢； 陶雪荣； 左尚志； 孙亮；

【Author】 HE Ren - yang CHEN Gang TAO Xue - rong ZUO Shang - zhi SUN Liang China Special Equipment Inspection and Research Center,Beijing 100013

【机构】 中国特种设备检测研究中心；

【摘要】 本文简要介绍了国内首次系统完成的城市埋地燃气管道的管道普查、外腐蚀检测、安全评定与风险评估的应用实例。该实例以国外管道外腐蚀检测以及管道完整性管理等标准为基础,应用国家“九五”和“十五”科技攻关课题的研究成果,对某市从郊区首站至市区调压站的两条长约90km高压燃气管道进行了检测与评定,即:采用国内外先进的检测仪器与检测技术,对管道进行了外防腐层检测与阴极保护效果测试;采用缺陷端点衍射技术对超标缺陷进行测高;采用U因子法、常规评定方法以及压力管道直管段体积型缺陷评定方法分别对含超标缺陷的环向焊口、螺旋焊口以及局部减薄进行安全评定;并且对这两条燃气管道进行了风险评估。这是国内首次在城市高压燃气管道上完成的最全面的管道外腐蚀检测与安全评定及风险评估工作。更多还原

【Abstract】 The application case of underground pipeline detection & surveying, external corrosion inspection, defect safety assessment and the risk assessment for a city gas underground pipeline is introduced briefly in this paper. Based on the NACE standards on pipeline safety inspection and integrity management , as well as the research achievements of nineth and tenth - five - years national key scientific and technology projects, two buried gas pressure pipelines, which is 90 km in total, and for transporting gas from the suburb transmission first station to downtown regulator, was investigated. By adopting the advanced inspection equipment and technology, the external coating and the effectiveness of cathode protection of the pipings was examined. The height of unacceotable defects in the pipings were measured by tip diffraction method and those in spiral and butt - welded joint and local wall thinning area were assessed for safety by using U - factor method, conventional assessment method or the assessment method for volu-matic defects in the straight section of the piping. In addition, the risk of the two city gas pipelines was assessed. This application case is the first complete inspection of external corrosion protection, safety assessment and risk assessment for the city gas underground pressure pipeline case in China.更多还原