PREDICTIVE MAINTENANCE OF PIPELINES WITH DIFFERENT TYPES OF DEFECTS

The paper describes a tested and proven practical methodology of predictive maintenance of pipelines with two types of defects—«loss of metal» and «pipe wall lamination», detected by the ILI technology.For the defects of the «pipe wall lamination» type the assessment of their level of danger is conducted only after they are converted to surface «loss of metal» type defects. The paper presents models on how to adequately convert the «pipe wall lamination» type of defects to the «loss of metal» type defects.A methodology is described on how to rank the defects according to their level of danger (with respect to the rupture type of failure), and how to perform the probabilistic assessment of the residual life of the inspected pipeline. The defects detected by the ILI are divided, depending on their type, size, and the level of safety factor, into three following categories: Dangerous, Potentially dangerous and Not dangerous defects. In order to account for «leak» and «rupture» types of failure, a computer based express assessment is developed of the level of severity of each defect. This defect assessment is based on graphs, which restrict the permissible sizes of defects and allow making operative decisions as to which maintenance measures should be taken, regarding each detected defect and the pipeline segment as a whole. The pipeline defects are ranked according to their potential danger, which depends on their location on the graphs. These graphs form five zones, which define the level of the defects danger.The probabilistic assessment of the residual pipeline life is performed taking into account the stochastic nature of defect growth. In order to achieve this, the maximal γ-percentile corrosion rate is defined over all detected defects. The distribution of the n detected pipeline defects is described by the two-parameter Weibull probability density function (PDF).  As the main decision parameter the gamma-percent operating time is chosen. It is characterized by 1) the safe operating time, and 2) the percentile probability that during this time the pipeline limit state will not be reached.A detailed example of implementation of the described methodology to a real product pipeline segment operating in a severe corrosion environment is given. The economical effect of the implementation is outlined

Diagnostics and reliability of pipeline systems

The book contains solutions to fundamental problems which arise due to the logic of development of specific branches of science, which are related to pipeline safety, but mainly are subordinate to the needs of pipeline transportation.          The book deploys important but not yet solved aspects of reliability and safety assurance of pipeline systems, which are vital aspects not only for the oil and gas industry and, in general, fuel and energy industries , but also to virtually all contemporary industries and technologies. The volume will be useful to specialists and experts in the field of diagnostics/ inspection, monitoring, reliability and safety of critical infrastructures. First and foremost, it will be useful to the decision making persons —operators of different types of pipelines, pipeline diagnostics/inspection vendors, and designers of in-line –inspection (ILI) tools, industrial and ecological safety specialists, as well as to researchers and graduate students

Abstracts of The Second Eurasian RISK-2020 Conference and Symposium

This abstract book contains abstracts of the various research ideas presented at The Second Eurasian RISK-2020 Conference and Symposium.The RISK-2020 Conference and Symposium served as a perfect venue for practitioners, engineers, researchers, scientists, managers and decision-makers from all over the world to exchange ideas and technology about the latest innovation developments dealing with risk minimization