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为保证输油管道超设计压力运行的安全,针对钢管力学性能、管道临界缺陷尺寸、环焊缝质量验证3个影响管道承压的重要因素,在管道沿程压力计算基础上,开展了管材小试样屈服强度统计与试验、钢管实物屈服强度与小试样屈服强度差异性分析、管道临界缺陷尺寸计算与内检测精度分析、环焊缝性能验证方案的研究。研究表明:钢管实物屈服强度与管材最小要求屈服强度之比即为最大运行压力与设计压力之比;由于压力升高,管道运行时允许的缺陷尺寸减小,其中大于临界尺寸的缺陷应保证被现有管道内检测器发现,否则应降低运行压力从而增大临界缺陷尺寸值;超设计压力运行前,应进行一次相应强度的现场试压,排除环焊缝异常。
In order to ensure the safety of oil pipeline over design pressure operation, three important factors influencing pipeline bearing pressure were investigated in view of the mechanical properties of steel pipe, the critical defect size of pipeline and the quality of girth weld. Based on the pressure calculation of pipeline along the pipeline, Such as the yield strength statistics and tests, the difference between the yield strength of the steel pipe and the yield strength of the small sample, the calculation of the critical dimension of the pipe defects and the accuracy of the internal inspection, and the performance verification scheme of the girth weld. The results show that the ratio of the maximum yield pressure to the minimum required yield strength of the pipe is the ratio of the maximum operating pressure to the designed pressure. Due to the pressure increase, the allowable defect size decreases during pipe running. The defects larger than the critical dimension should be guaranteed Existing pipeline detectors found that, otherwise, the operating pressure should be reduced to increase the critical defect size value; before the design pressure operation, a corresponding on-site pressure test should be conducted to eliminate the girth weld abnormalities.