输油管道运行参数及检测数据的统计分析

统计了某输油管道运行压力和温度、腐蚀检测数据以及管材性能等数据,并进行了分析.对于管道运行温度和压力,推荐了概率分布;对于腐蚀缺陷的深度和长度,分别推荐了指数分布和对数正态分布.拟合腐蚀检测数据,得到了缺陷深度和长度的统计特征值.对管材性能参数推荐采用正态分布,这种分布在95%的置信度下可通过假设检验.认为该输油管道的统计分析结果可以作为输油管道安全评定的基础.

Statistic Analysis about Operation Parameters and Inspection Data of an Oil Pipeline

Statistic analysis about operation parameters and inspection data of an oil pipeline is of importance to safety assessment of a pipeline in service. In this paper, an oil pipeline is investigated and its data is collected about operation pressure and temperature,corrosion inspection,pipeline material performance and so on. For operation pressures and temperatures, statistic characteristic values are obtained by means of statistical analysis and probabilistic distribution types are recommended. For the depth and length of corrosion defects, the exponent distribution and lognormal distribution are recommended, respectively, so that the statistic characteristic values of corrosion defect size are fit from corrosion inspection data. The normal distribution is recommended for performance parameters of pipeline materials as yield strength and tensile strength. It can pass assumption check with confidence level 95%. These statistic results can be fundamental to safety assessment of pipelines in service.