The methods of assessment of the limit state of failure of the pipelines from transport systems are characterized by high safety factors. The current trend is that by more accurate calculation methods, structured on several levels and based on the information about the factors involved in the evaluation process (material characteristics, pipeline thickness, operating pressure and their range of variation, the precision of the used investigation method, the security class of pipeline) these safety factors may be reduced. The mentioned aspects can be found in many papers and in the recent versions of standards DNV RP 579 and API 101. The paper shows the importance of considering the defect position to reduce the level of conservatism of the method of evaluation. This is possible in the modern methods of inspection which indicates the position of the defect. Based on the results of an inspection we can calculate the probability of failure of a pipeline and it can be an indicator of pipeline safety instead of the actual indicator expressed by the number of defects per km established by the operator or by the third parties. Any inspection of a pipeline has to be followed by a maintenance program based on available information. In this case, even if we have to emit certain assumptions and approximations (such as neglecting the interaction between the defects), the repairs of a pipeline may be indicated at the right time to maintain the safety in the operation.


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    Title :

    Safety Evaluation of the Pipelines Systems for Petroleum Products


    Contributors:
    Minescu, Mihail (author) / Pana, Ion (author)


    Publication date :

    2013


    Size :

    5 Seiten




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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