西南石油大学学报(自然科学版) ›› 2008, Vol. 30 ›› Issue (6): 157-160.DOI: 10.3863/j.issn.1000-2634.2008.06.038

• 石油机械工程及其它 • Previous Articles     Next Articles

LEAK DETECTION AND POSITIONING FOR HOT OIL PIPELINE UNDER COMPLICATED CONDITIONS

CHEN Zhi-gang1,2 ZHANG Lai-bin2 LIANG Wei2 TAO Hua2   

  1. 1.Department of Mechanic Engineering，Beijing Institute of Civil Engineering and Architecture，Beijing 100044，China；2.College of Mechanical and Electronic Engineering，China University of Petroleum，Beijing 102249，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20

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Abstract: For overcoming the difficulty of leak detection for hot oil pipeline under complicated conditions,a method based on MSVM（MultiSupport Vector Machine）is proposed and the diagnosis model is established.The model training can be completed in a few samples to distinguish different conditions of pipelines.Moreover,in hot oil pipeline negtive pressure wave,velocity is affected by oil and pipeline axial temperature drop.Positioning usually has obvious error.For solving this problem,axial temperature drop is analyzed and pressure velocity is revised.By means of NewtonCotes integration method,positioning formula is improved.The field experiment shows that abnormal conditions including leakage of pipeline can be distinguished effectively by using the method based on MSVM and the improved positioning formula makes the positioning more accurate，from 2.5% up to 1.0%.

Key words: hot oil pipeline, leak detection, MSVM, negative pressure, axial temperature drop

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