دانلود رایگان مقاله آنالیز شکست خط لوله نفت نشت شده

Abstract

An oil pipeline embedded in an underground trench had failed. Through the accident investigation we found that there was a perforation at the leak point of the pipeline. Macroscopic observation revealed that some pits collectively located at the exterior surface of the failed pipeline. In addition, raised ridges and circumferential cracks were observed inside the large pits with stereoscope and scanning electron microscope. After careful analysis it is concluded that the leakage of the pipeline was mainly caused by the liquid impingement erosion.

5. Conclusions and suggestions

Based on the experimental observations and the analysis above, it can be concluded that the failure of the oil pipeline should be originated from the liquid impingement erosion induced by falling raindrop. Thus, suggestions to prevent the recurrent of the accident may include: (1) Adding water-proof coating or cover to avoid the direct exposure of the external surface of the pipeline, which may be also beneficial for averting other types of erosion and corrosion; (2) keeping the underground trench always dry; (3) periodically checking the covered cement boards, and ensuring no locally large holes. The present work provides sufficient experimental evidences for liquid impingement erosion, which may be helpful for future engineering failure analysis.