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The Reliability Analysis and Maintenance Decision-Making for Existing Submarine Pipelines

Author: ZuoHuaWei
Tutor: KangHaiGui
School: Dalian University of Technology
Course: Port, Coastal and Offshore Engineering
Keywords: Subsea pipeline SPANNING Reliability Reliable indicator Seismic forces He waves lift
CLC: U178
Type: Master's thesis
Year: 2002
Downloads: 303
Quote: 1
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Abstract

Subsea pipelines is the lifeline of the offshore oil and gas fields, it's safe or not directly related to the survival of the entire oil and gas fields. For subsea pipeline commenced from all aspects of the design, construction, testing, maintenance, and achieved certain results. However, for active duty subsea pipeline, complex and volatile due to their marine environment, over a period of time in service after the work status change, then we should be checking the remaining time in the design reference period, but also ability to complete the scheduled function. That structural failure occurs, based on the need for maintenance, as well as to make maintenance decisions and so still a nascent field, further research is needed. In this paper, the reliability theory to expand research in this area of ??the subsea pipeline span length research the ultimate destruction of the subsea pipeline from the reliability point of view, to provide a further basis for the maintenance decision. The structural assessment of the safety standards and analytical methods used are consistent target reliability index as the standard reliability analysis methods. Therefore, take full account of the structure of the economy and risk factors, fuzzy optimization approach, subsea pipeline when the need for maintenance of critical safety factor, based on the inversion of different failure modes under different environmental loading conditions determine each case the target reliability index. This paper studies the suspended subsea pipeline strength failure under extreme loads - seismic force, destruction, and in accordance with this strength pipeline failure mode Dynamic Reliability Analysis. Goal in this mode of failure of the subsea pipeline reliable indicator reliability assessment is to obtain the most dangerous span length hanging cross case. Second, spanning the formation of the subsea pipeline in flutter wave forces under prone to fatigue failure, therefore, the fatigue damage failure mode, its fatigue reliability analysis, and a reliable indicator of the objectives of the failure mode assessment, spanning submarine pipeline fatigue failure limit span length. The results showed that the fatigue failure mode to determine the ultimate cross-reliability analysis under the above two failure modes, the long-term strength failure modes to determine the limit of span length is less than seismic force, can be seen later when subsea pipelines form a hanging cross, wave under the force of the fatigue problem is the main controlling factor to avoid pipeline failure. When the pipeline spanning the length of the fatigue failure to determine the limits of the span length, repairs should be made according to the actual situation of decision-making.

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